Stink bugs are shield-shaped insects recognized for the strong odor they release when threatened. Although some species damage fruits, vegetables, seeds, and field crops, others are beneficial predators that control caterpillars and beetle larvae. Their colors range from plain brown and green to striking combinations of red, orange, black, and metallic blue. This guide explores 31 types of stink bugs and shieldbugs, including their identification features, habitats, diets, behavior, distribution, and life cycles, helping you distinguish harmful agricultural pests from useful garden predators.
1. Brown Marmorated Stink Bug
The brown marmorated stink bug (Halyomorpha halys) is an invasive insect native to East Asia. It has spread across North America and parts of Europe, where it damages fruits, vegetables, and field crops. Adults commonly enter houses during autumn to find protected places for overwintering.
Identification
- Adults measure approximately 12–17 mm long.
- The body is shield-shaped and mottled brown.
- Antennae have alternating white and dark bands.
- The outer abdomen displays alternating light and dark markings.
- The shoulders are smooth and rounded.
- Young nymphs may have red, black, and white coloration.
Habitat and Distribution
Brown marmorated stink bugs occur in gardens, orchards, farms, forests, and residential areas. They are particularly common around apple, peach, pear, soybean, and vegetable crops. In autumn, adults gather on sunny walls before entering houses, sheds, garages, and other structures. They are now established across much of the United States and in several other countries.
Behavior and Diet
This stink bug feeds by inserting its piercing mouthparts into plant tissue and extracting fluids. Its feeding can leave fruit discolored, deformed, corky, or unsuitable for sale. It consumes material from hundreds of plant species. When disturbed or crushed, the bug releases a strong-smelling defensive chemical. Adults fly well and can move between crops as food availability changes.
Lifespan and Life Cycle
Adults survive winter in a dormant state and become active when temperatures rise in spring. Females lay clusters of barrel-shaped eggs on the undersides of leaves. The eggs hatch into colorful nymphs that pass through five developmental stages. Depending on climate, the species may produce one or two generations annually. An adult can survive for several months and may live close to a year when overwintering is included.
2. Southern Green Stink Bug
The southern green stink bug (Nezara viridula) is a widespread agricultural pest found in warm regions worldwide. It attacks numerous crops, including beans, tomatoes, cotton, corn, and soybeans. Its bright green body provides effective camouflage among leaves, making early infestations difficult to notice.
Identification
- Adults usually measure 12–15 mm long.
- The body is broad, shield-shaped, and bright green.
- Three small pale spots appear along the front of the scutellum.
- Narrow reddish or pink bands may occur on the antennae.
- Newly hatched nymphs are dark and remain grouped together.
- Older nymphs develop green, black, red, and white markings.
Habitat and Distribution
Southern green stink bugs prefer tropical, subtropical, and warm temperate environments. They live in crop fields, vegetable gardens, orchards, weedy borders, and grassy areas. The species is believed to have originated in Africa or the Mediterranean region but is now distributed throughout the Americas, Asia, Australia, and other warm areas.
Behavior and Diet
Both adults and nymphs suck sap from developing seeds, pods, stems, and fruits. Feeding can cause shriveled seeds, spotted fruit, reduced crop quality, and premature plant growth. These bugs often move from weeds into cultivated fields when crops begin producing fruit or seed. Like other stink bugs, they release an unpleasant odor when threatened.
Lifespan and Life Cycle
Females place large clusters of pale, barrel-shaped eggs beneath leaves. One cluster may contain dozens of eggs arranged in neat rows. After hatching, nymphs pass through five stages before becoming adults. Development may take four to eight weeks, depending on temperature and food. Several generations can occur annually in warm climates, while adults may enter a period of reduced activity during cooler months.
3. Green Stink Bug
The green stink bug (Chinavia hilaris) is a common North American species recognized by its large, bright green body. Although attractive in appearance, it can damage fruits, vegetables, and field crops. It is especially noticeable from late summer through autumn when adults become active around gardens and farms.
Identification
- Adults are approximately 13–19 mm long.
- The body is bright green and shaped like a broad shield.
- A narrow yellow, orange, or reddish border surrounds the body.
- The antennae usually have dark bands.
- The underside is pale green.
- Nymphs are primarily black with colorful orange, white, or green markings.
Habitat and Distribution
Green stink bugs are widely distributed across the United States and southern Canada. They inhabit orchards, crop fields, woodland edges, gardens, and areas with flowering plants. Adults and nymphs frequently appear on fruit trees, shrubs, weeds, and crops such as soybean, cotton, corn, tomato, and bean.
Behavior and Diet
The green stink bug inserts its needlelike mouthparts into plant tissues to remove fluids. It prefers developing fruit, pods, and seeds, where feeding can cause dimples, scars, discoloration, or malformed growth. The bug may move between wild plants and cultivated crops throughout the growing season. When approached, it often drops from the plant or flies away. Its defensive odor discourages many predators.
Lifespan and Life Cycle
Adults usually overwinter beneath leaf litter, tree bark, or other protected material. They emerge in spring and feed before mating. Females deposit clusters of approximately 20–50 eggs on leaves. The young nymphs remain near the empty eggshells briefly before dispersing. They complete five nymphal stages over several weeks. One or two generations are generally produced each year, although additional generations may occur in warmer southern areas.
4. Brown Stink Bug
The brown stink bug (Euschistus servus) is a native North American species and a significant pest of agricultural crops. Its plain brown coloration helps it blend into dry leaves, soil, and plant stems. It is frequently found feeding on corn, cotton, soybean, fruit, and vegetable crops.
Identification
- Adults generally measure 10–15 mm long.
- The body is mottled grayish-brown or yellowish-brown.
- Its shield-shaped body has slightly pointed shoulders.
- The underside is usually pale yellow or tan.
- Antennae are brownish without bold white bands.
- Nymphs are rounded and may display brown, green, black, and pale markings.
Habitat and Distribution
Brown stink bugs occur throughout much of the United States, southern Canada, Mexico, and parts of Central America. They occupy crop fields, orchards, pastures, gardens, woodland edges, and weedy areas. During colder months, adults seek shelter beneath leaf litter, crop residue, tree bark, or dense vegetation rather than gathering inside houses in large numbers.
Behavior and Diet
This species feeds on the sap of seeds, pods, stems, and developing fruits. It can damage corn kernels, cotton bolls, soybeans, peaches, tomatoes, and other crops. Feeding punctures may introduce microorganisms that contribute to decay. Brown stink bugs are strongest fliers during warm weather and often travel from surrounding weeds into crop fields.
Lifespan and Life Cycle
Overwintered adults become active during spring and begin mating after feeding. Females lay clusters of light-colored, barrel-shaped eggs on leaves and stems. Nymphs hatch within several days and pass through five stages before reaching adulthood. Development generally takes about five to eight weeks. The number of yearly generations varies by region, with one generation common in cooler areas and two or more possible in southern climates.
5. Dusky Stink Bug
The dusky stink bug (Euschistus tristigmus) is a mottled brown species native to North America. It resembles several other brown stink bugs but can be recognized by its pointed shoulders and dark markings. It feeds on numerous wild and cultivated plants but is usually considered a less serious pest than some related species.
Identification
- Adults usually measure around 10–13 mm long.
- The body is grayish-brown or dark brown.
- The shoulders are noticeably sharp and pointed.
- Small dark spots may appear on the underside of the abdomen.
- The body surface has a rough, finely punctured texture.
- Nymphs are rounded and patterned with brown, black, cream, or orange.
Habitat and Distribution
Dusky stink bugs occur across much of eastern and central North America. They inhabit deciduous forests, woodland borders, gardens, orchards, meadows, and agricultural fields. They are often found on trees, shrubs, and herbaceous plants. Leaf litter and loose bark provide important shelter for adults during winter.
Behavior and Diet
This stink bug consumes fluids from many plants, including fruit trees, weeds, soybean, corn, and other crops. It usually feeds on developing seeds and fruits but may also probe stems and leaves. The insect relies on camouflage to remain unnoticed against bark and dead vegetation. If disturbed, it may release an unpleasant odor, drop to the ground, or fly to another plant.
Lifespan and Life Cycle
Adults overwinter in sheltered locations and emerge during spring. After mating, females attach clusters of barrel-shaped eggs to plant surfaces. The nymphs remain together shortly after hatching but separate as they grow. They develop through five nymphal stages, gradually acquiring the brown color and pointed shoulders of adults. Most populations produce one generation annually, although warmer conditions may allow another. Adults can live for several months, especially when they survive winter.
6. Redbanded Stink Bug
The redbanded stink bug (Piezodorus guildinii) is an important pest of soybeans and other legume crops. It is smaller than many common stink bugs and is recognized by the reddish or purple band crossing its upper body. Although native to tropical and subtropical regions of the Americas, it has expanded into major agricultural areas.
Identification
- Adults measure approximately 8–11 mm long.
- The body is light green and shield-shaped.
- A reddish, pink, or purple band crosses the shoulders.
- The border of the abdomen may have reddish markings.
- Antennae are greenish or reddish-brown.
- Nymphs are dark at first and later develop green, red, black, and white patterns.
Habitat and Distribution
Redbanded stink bugs are common in South America, Central America, the Caribbean, Mexico, and the southern United States. They thrive in warm environments and are especially associated with soybean-growing regions. They also inhabit fields containing beans, peas, alfalfa, clover, and wild legumes that provide alternative food.
Behavior and Diet
This species mainly attacks developing seeds inside pods. Its feeding can produce shriveled beans, reduced seed quality, delayed plant maturity, and lower yields. Redbanded stink bugs are highly mobile and may quickly invade soybean fields when pods appear. They can be challenging agricultural pests because populations may remain active late into the season and are sometimes difficult to control.
Lifespan and Life Cycle
Females lay small groups of eggs on pods, leaves, and stems. After hatching, the nymphs complete five developmental stages while feeding on plant fluids. Warm weather can shorten development and support several generations each year. Unlike species adapted to cold winters, redbanded stink bugs are sensitive to prolonged freezing temperatures. Populations often survive in warmer southern locations and spread northward during the growing season.
7. Rice Stink Bug
The rice stink bug (Oebalus pugnax) is an important agricultural pest that primarily attacks rice and other seed-producing grasses. Its feeding is especially damaging while rice grains are developing. Heavy infestations can reduce grain weight, quality, and market value while increasing the risk of discoloration and fungal contamination.
Identification
- Adults usually measure 8–12 mm long.
- The body is narrow, elongated, and yellowish-brown.
- Each shoulder has a sharp spine pointing forward.
- The scutellum is long and triangular.
- Dark spots may appear on the underside of the abdomen.
- Nymphs are initially dark but become tan or brown as they mature.
Habitat and Distribution
Rice stink bugs are widely distributed throughout the eastern and southern United States, with additional populations in Mexico and parts of the Caribbean. They are particularly common in rice-growing regions. Outside cultivated fields, they live among wild grasses, sedges, and weedy plants that produce suitable seeds.
Adults often move from wild grasses into rice fields when the crop begins developing seed heads. After harvest, they return to uncultivated grassy areas where food and shelter remain available.
Behavior and Diet
The rice stink bug uses piercing mouthparts to extract liquid from developing grains. Feeding during the early milk stage may produce empty or severely damaged kernels. Later attacks can cause discolored spots, reduced grain weight, and broken kernels during processing.
The species also feeds on wheat, sorghum, millet, corn, and various wild grasses. Adults are strong fliers and can rapidly enter newly available fields.
Lifespan and Life Cycle
Adults spend winter near the ground in grass clumps and sheltered vegetation. They become active in spring and lay clusters of approximately 10–30 barrel-shaped eggs on leaves or seed heads. Eggs usually hatch within five days during warm weather. Nymphs pass through five stages and may reach adulthood within 15–28 days. Several generations can develop annually in warmer regions.
8. Consperse Stink Bug
The consperse stink bug (Euschistus conspersus) is a western North American species known for damaging pears, apples, peaches, and vegetable crops. Its name refers to the numerous scattered dark spots covering its body. Because it resembles other brown stink bugs, careful examination is often necessary for accurate identification.
Identification
- Adults measure approximately 9–12 mm long.
- The body ranges from grayish-brown to greenish-brown.
- Numerous tiny black spots cover the body and legs.
- The shoulders are rounded rather than sharply pointed.
- Legs and antennae are yellowish, orange, or reddish.
- The tips of the antennae are usually darker.
- The underside may appear yellow, gray, or pale green.
Habitat and Distribution
Consperse stink bugs occur primarily in western North America, including western Canada, the western United States, and northern Mexico. They live in orchards, vegetable gardens, agricultural fields, grasslands, and weedy areas.
During spring, adults often feed and reproduce on wild plants outside orchards. As these plants dry out, the bugs move into irrigated crops and fruit trees. Pear orchards in western regions are especially vulnerable to feeding damage.
Behavior and Diet
Adults and nymphs feed on developing fruit, seeds, pods, and plant stems. Common hosts include pears, apples, peaches, tomatoes, beans, corn, and numerous weeds. Feeding on young fruit may create deep depressions and corky tissue beneath the skin. Damage occurring close to harvest can leave smaller punctures or discolored areas.
Lifespan and Life Cycle
Adults overwinter beneath plant debris, leaf litter, tree bark, and other protected material. Females emerge in spring and deposit clusters of pearly white, barrel-shaped eggs on leaves and twigs. The eggs may turn pink before hatching. Nymphs complete five developmental stages, and the entire journey from egg to adult can take approximately two months. One or more generations may occur each year, depending on local temperatures.
9. Conchuela Stink Bug
The conchuela stink bug (Chlorochroa ligata) is a distinctive plant-feeding species found across warmer parts of North America. Adults are recognized by the contrasting border around their shield-shaped bodies. The insect feeds on numerous wild and cultivated plants and can become an occasional pest of cotton, fruit, and vegetable crops.
Identification
- Adults generally measure 13–19 mm long.
- The body is dark brown, black, or occasionally greenish.
- A red, orange, or yellow border surrounds the body.
- A similarly colored spot appears near the tip of the scutellum.
- The shoulders are broad and slightly angled.
- Nymphs may be greenish or dark with contrasting red markings.
Habitat and Distribution
Conchuela stink bugs are found from the southwestern United States through Mexico and into parts of Central America. They are especially common in Texas, New Mexico, Arizona, California, and nearby regions. Typical habitats include crop fields, orchards, rangelands, gardens, desert vegetation, and weedy field borders.
The bugs frequently gather on fruiting plants where seeds, pods, or berries provide concentrated food. Wild plants are important hosts between agricultural growing seasons.
Behavior and Diet
Conchuela stink bugs consume fluids from fruits, seeds, stems, and pods. Recorded host plants include cotton, sorghum, alfalfa, mesquite, tomatoes, peppers, grapes, and various weeds. Their feeding can deform young seeds, discolor fruit, and reduce crop quality.
Adults and nymphs sometimes feed together in large groups. When threatened, they release a strong defensive odor and may drop from the host plant.
Lifespan and Life Cycle
Adults overwinter in protected locations and become active during spring. Females lay groups of barrel-shaped eggs on host plants. After hatching, nymphs pass through five developmental stages, each lasting approximately five to seven days under favorable conditions. Development from egg to adult may take about 35 days. Multiple generations are possible in warm areas, and individual adults may survive for more than 70 days.
10. One-Spotted Stink Bug
The one-spotted stink bug (Euschistus variolarius) is a common North American brown stink bug. It closely resembles the ordinary brown stink bug, making the two difficult to distinguish from above. Its common name comes from a single dark spot found on the underside of adult males rather than a visible mark on the back.
Identification
- Adults usually measure 11–15 mm long.
- The upper body is mottled brown or grayish-brown.
- The shoulders are pointed but not extremely sharp.
- Legs are tan with numerous small brown spots.
- Antennae lack the white bands seen on brown marmorated stink bugs.
- Adult males have one dark spot on the underside near the end of the abdomen.
- Females are more difficult to separate from related species.
Habitat and Distribution
One-spotted stink bugs are distributed across southern Canada and much of the United States. They inhabit crop fields, orchards, gardens, meadows, woodland borders, and areas containing tall weeds. They are generally more common in northern and central regions than in the far South.
Adults frequently spend winter beneath leaf litter, loose bark, fallen logs, and other natural debris. In spring, they move onto weeds and cultivated plants.
Behavior and Diet
This species feeds on more than two dozen plant species from several families. It uses its piercing mouthparts to extract fluids from seeds, fruits, pods, and stems. Soybeans, corn, fruit trees, vegetables, and wild plants can serve as food.
Feeding may leave punctures, sunken areas, malformed fruit, or poorly developed seeds. However, severe outbreaks are less frequently reported than with certain other agricultural stink bugs.
Lifespan and Life Cycle
Overwintered adults emerge during spring, feed, mate, and begin laying clusters of pale, barrel-shaped eggs. Young nymphs remain near their eggs briefly before dispersing. They complete five nymphal stages without forming a pupal stage. One or two generations may occur annually, depending on temperature and location. Adults produced late in the season find protected shelters and remain inactive through winter.
11. Black Stink Bug
The black stink bug (Proxys punctulatus) is a striking species recognized by its glossy dark body and contrasting pale markings. It occurs primarily in warm regions of the Americas. Although it feeds on crops and other plants, observations suggest that it may occasionally consume small insects or other animal material.
Identification
- Adults generally measure 11–13 mm long.
- The body is predominantly shiny black.
- A distinct white or yellow spot appears near the tip of the scutellum.
- Pale markings may occur on the legs and body margins.
- The shoulders are pointed outward.
- The underside may contain black and cream-colored patterns.
- Nymphs are rounded and patterned with black, pale, and reddish colors.
Habitat and Distribution
Black stink bugs occur across the eastern and southern United States, especially from the Mid-Atlantic region to Florida and Texas. Their wider range extends through Mexico, Central America, the Caribbean, and South America. They inhabit gardens, agricultural fields, citrus-growing areas, woodland edges, and patches of weedy vegetation.
Warm, humid habitats support the largest populations. Adults are often discovered resting or feeding on leaves, flowers, fruits, and plant stems.
Behavior and Diet
The black stink bug has been recorded on cotton, soybean, citrus, and several wild plants. Like other stink bugs, it inserts its beak into tissue and removes liquid food. Large populations may damage young fruit or developing seeds, although this species is not usually considered a major widespread pest.
Some individuals have also been observed engaging in predatory or scavenging behavior. When disturbed, the bug may fly away or release an unpleasant-smelling defensive secretion.
Lifespan and Life Cycle
Females lay clusters of barrel-shaped eggs on suitable host plants. Nymphs emerge and develop through five stages, becoming larger and more adult-like after each molt. There is no caterpillar or pupal stage. Development speed depends heavily on temperature and food availability. Multiple generations may occur in tropical regions, while populations in cooler areas experience a shorter active season. Adults likely survive unfavorable periods in sheltered vegetation or plant debris.
12. Twice-Stabbed Stink Bug
The twice-stabbed stink bug (Cosmopepla lintneriana) is a small, colorful North American species. Its black body features two bright red marks that resemble puncture wounds, explaining its unusual common name. It feeds on many herbs and flowering plants but rarely causes serious damage in gardens or agricultural fields.
Identification
- Adults usually measure 5–7 mm long.
- The body is small, rounded, and mostly black.
- Two red or orange spots appear on the scutellum.
- A red or orange line crosses the shoulders.
- Additional red markings border parts of the abdomen.
- Antennae and legs are primarily black.
- Nymphs are black with red, orange, or pale markings.
Habitat and Distribution
Twice-stabbed stink bugs are widely distributed across Canada and the United States. They live in meadows, gardens, woodland clearings, roadsides, prairies, wetlands, and agricultural borders. Adults frequently appear on flowering plants during spring and summer.
Common host plants include mint, goldenrod, raspberry, milkweed, thistle, and several members of the carrot and mustard families. Their small size allows them to remain concealed among flowers and developing seed heads.
Behavior and Diet
Both adults and nymphs feed by extracting sap from stems, flowers, fruits, and seeds. They consume material from numerous plant species and may occasionally appear on cultivated crops. However, their feeding normally causes only minor localized damage.
Their bold red-and-black coloration may warn predators about their unpleasant chemical defenses. When disturbed, they release an odor, hide beneath foliage, fall from the plant, or fly away.
Lifespan and Life Cycle
Adults generally overwinter in protected places such as leaf litter, loose bark, and dense vegetation. They return to host plants in spring, where mating and egg laying occur. Females place small groups of barrel-shaped eggs on plant surfaces. The nymphs hatch and pass through five stages before developing functional wings. Depending on climate, the species may produce one or more generations per year. Adults remain visible until cooler autumn weather drives them into winter shelters.
13. Bagrada Bug
The Bagrada bug (Bagrada hilaris), sometimes called the painted bug, is a small but destructive stink bug that attacks plants in the mustard family. It can severely damage seedlings of broccoli, cabbage, cauliflower, kale, and related crops. Large populations may cause young plants to wilt, become stunted, or die.
Identification
- Adults usually measure 5–7 mm long.
- The body is shield-shaped and mainly black.
- Bright orange, red, and white markings cover the back.
- The head is relatively narrow compared with the abdomen.
- Eggs are creamy white when laid and later turn orange.
- Nymphs are reddish-orange at first and develop darker markings as they grow.
- Adults resemble miniature harlequin bugs.
Habitat and Distribution
The Bagrada bug is native to parts of Africa, Asia, and the Mediterranean region. It has become established in Mexico and the southwestern United States, particularly in warm, dry areas. It inhabits vegetable farms, nurseries, gardens, roadsides, weedy fields, and places where mustard-family plants grow.
Unlike many stink bugs that place eggs on leaves, females may hide their eggs in cracks in the soil or beneath plant debris. This behavior protects the eggs from heat, predators, and some control treatments.
Behavior and Diet
Bagrada bugs frequently gather in groups and feed during the warmest parts of the day. Adults and nymphs pierce leaves and stems to extract plant fluids. Feeding creates pale, star-shaped spots that may merge into larger damaged areas. Severe infestations can scorch leaves and destroy growing points.
Lifespan and Life Cycle
Females lay eggs individually or in small groups, usually in soil or near host plants. The nymphs pass through five developmental stages before becoming adults. Under warm conditions, development from egg to adult may take approximately three to six weeks. Several overlapping generations can occur annually, allowing populations to increase rapidly during hot weather. Adults and late-stage nymphs may survive cooler periods in sheltered locations.
14. Harlequin Bug
The harlequin bug (Murgantia histrionica) is a brightly colored stink bug and a major pest of cabbage-family plants. Its striking orange, red, yellow, and black patterns make it one of the easiest stink bugs to recognize. Both adults and nymphs can weaken plants by continuously removing fluids from their leaves and stems.
Identification
- Adults measure approximately 8–11 mm long.
- The body is shield-shaped and primarily black.
- Orange, red, or yellow markings form symmetrical patterns.
- Color and pattern intensity can vary among individuals.
- Eggs are white and shaped like small barrels.
- Each egg has two black bands and a dark spot.
- Nymphs are rounded with black, orange, red, and white markings.
Habitat and Distribution
Harlequin bugs occur across much of the southern United States and extend northward during warm growing seasons. They are common in vegetable gardens, agricultural fields, nurseries, weedy borders, and areas containing wild mustard plants.
They strongly prefer members of the mustard family, including broccoli, cabbage, cauliflower, kale, collards, turnips, radishes, horseradish, and mustard greens. Cleome is another particularly attractive host plant.
Behavior and Diet
Adults and nymphs insert their piercing mouthparts into leaves and suck out plant fluids. Their feeding creates cloudy white or yellow spots called stipples. Heavily attacked leaves may turn brown, become distorted, and die. Seedlings can wilt or collapse when large groups feed on them.
When disturbed, harlequin bugs hide beneath leaves, drop from the plant, or release a strong odor.
Lifespan and Life Cycle
Adults overwinter beneath plant debris, mulch, boards, and other protected objects. They emerge in spring and lay clusters of approximately 12 barrel-shaped eggs, commonly arranged in two rows. Nymphs hatch and complete five developmental stages. The entire process from egg to adult generally takes about one to two months. Two or three generations may occur annually, with additional generations possible in consistently warm climates.
15. Spined Soldier Bug
The spined soldier bug (Podisus maculiventris) is a beneficial predatory stink bug that helps suppress agricultural and garden pests. Instead of feeding mainly on plants, it attacks caterpillars and beetle larvae. Its pointed shoulders and predatory feeding habits distinguish it from many similar-looking brown, plant-feeding stink bugs.
Identification
- Adults generally measure 9–13 mm long.
- The body is mottled brown and shield-shaped.
- Each shoulder has a prominent outward-pointing spine.
- The underside is pale yellow or cream-colored.
- A dark spot appears on the membranous tip of each front wing.
- Legs are yellowish or light brown.
- Nymphs are rounded and patterned with red, black, orange, or cream.
Habitat and Distribution
Spined soldier bugs occur throughout much of North America. They inhabit crop fields, vegetable gardens, orchards, forests, meadows, and weedy areas. They are commonly found on plants where caterpillars and beetle larvae are abundant.
Agricultural habitats may include corn, soybean, cotton, potato, alfalfa, and vegetable fields. Their presence is generally beneficial because they reduce populations of leaf-eating insects.
Behavior and Diet
The spined soldier bug hunts by approaching prey and inserting its strong, needlelike beak into the victim. It injects digestive saliva and then consumes the liquefied contents. Common prey includes armyworms, cabbage loopers, corn earworms, sawfly larvae, Colorado potato beetles, and Mexican bean beetles.
Although it may occasionally drink plant fluids, it rarely causes meaningful crop damage.
Lifespan and Life Cycle
Females lay clusters of barrel-shaped eggs on leaves and stems. Newly hatched nymphs remain near the egg mass and initially consume moisture from plants. Later stages become active predators. They pass through five nymphal stages before adulthood. Development may take approximately four to eight weeks, depending on temperature and prey availability. Two or three generations commonly occur annually, and adults overwinter beneath bark, leaves, and plant debris.
16. Two-Spotted Stink Bug
The two-spotted stink bug (Perillus bioculatus) is a beneficial predator best known for attacking Colorado potato beetles. Its bold black-and-red, orange, cream, or white coloration makes it easy to notice. Both adults and older nymphs hunt agricultural pests, helping naturally protect potatoes and other crops from damaging insects.
Identification
- Adults usually measure 8–11 mm long.
- The body is broadly shield-shaped.
- Its background color is black.
- Contrasting markings may be red, orange, cream, yellow, or white.
- Two dark spots appear on the section immediately behind the head.
- A dark Y-shaped or anchor-like marking may appear on the back.
- Nymphs are rounded and usually red or orange with black markings.
Habitat and Distribution
Two-spotted stink bugs are native to North America and occur across southern Canada, the United States, and parts of Mexico. They inhabit potato fields, vegetable gardens, meadows, grasslands, and areas where leaf-feeding beetles are abundant.
Their distribution often follows populations of Colorado potato beetles. They may also appear on eggplants, tomatoes, and other plants supporting suitable prey.
Behavior and Diet
Adults and nymphs use their piercing beaks to attack beetle eggs and larvae. The Colorado potato beetle is a preferred target, but they may also consume caterpillars and other soft-bodied insects. A two-spotted stink bug approaches its prey, punctures the body, injects digestive fluids, and extracts the dissolved tissues.
This species is not considered dangerous to people, although it may produce an odor or deliver a defensive jab if handled roughly.
Lifespan and Life Cycle
Females deposit clusters of barrel-shaped eggs on leaves near available prey. Newly hatched nymphs remain together briefly before beginning to hunt. They progress through five developmental stages, becoming more active predators as they mature. Development from egg to adult generally requires several weeks during warm weather. Multiple generations may occur in favorable climates. Adults overwinter beneath leaf litter, bark, stones, or other sheltered material and become active again in spring.
17. Anchor Stink Bug
The anchor stink bug (Stiretrus anchorago) is a colorful predatory species named for the anchor-shaped marking frequently visible on its back. Its appearance varies considerably, with individuals displaying combinations of black, blue, green, orange, red, or cream. It benefits gardens and farms by consuming caterpillars, beetles, and other plant-eating insects.
Identification
- Adults generally measure 7–11 mm long.
- The body is broad, rounded, and shield-shaped.
- Colors may include metallic blue, green, black, orange, red, or cream.
- An anchor-shaped pattern often appears on the back.
- Body patterns vary greatly between individuals.
- The shoulders are rounded or slightly extended.
- Nymphs are dark with red, orange, blue, or cream-colored markings.
Habitat and Distribution
Anchor stink bugs occur across the southeastern United States, Mexico, Central America, the Caribbean, and parts of South America. They prefer warm climates and are found in crop fields, vegetable gardens, orchards, woodland borders, and flowering vegetation.
They are often encountered in areas with abundant caterpillars or beetle larvae. Agricultural habitats may include soybean, alfalfa, peanut, corn, and vegetable fields.
Behavior and Diet
This predatory stink bug searches leaves and stems for slow-moving insects. Its prey includes caterpillars, beetle larvae, and other soft-bodied arthropods. After capturing an insect, it inserts its beak and releases saliva containing digestive enzymes. It then consumes the liquefied internal tissues.
Anchor stink bugs may occasionally drink plant juices or moisture, but they are primarily predators and generally beneficial.
Lifespan and Life Cycle
Females place barrel-shaped eggs in organized clusters on plant surfaces. First-stage nymphs usually remain near the eggs and may not begin hunting immediately. After their first molt, they disperse and actively search for prey. Five nymphal stages occur before adulthood. Depending on temperature and food availability, development from egg to adult may require approximately 25–60 days. Multiple generations can occur each year in warm regions, where adults may remain active for extended periods.
18. Florida Predatory Stink Bug
The Florida predatory stink bug (Euthyrhynchus floridanus) is one of the largest and most noticeable predatory stink bugs in the southeastern United States. Its glossy black body and bright orange or red markings create a striking appearance. It attacks beetles, caterpillars, and other insects, making it a valuable natural predator.
Identification
- Adults usually measure 12–17 mm long.
- The body is broad, glossy black, and shield-shaped.
- Bright orange or red markings occur on the shoulders and abdomen.
- The shoulders extend outward into rounded or pointed projections.
- Legs and antennae are mostly black.
- Nymphs are dark blue or black with red or orange markings.
- Adults are larger and more robust than many plant-feeding stink bugs.
Habitat and Distribution
This species is found mainly in the southeastern United States, including Florida and neighboring states. Its range also extends into Mexico and parts of Central America. It inhabits forests, gardens, citrus groves, crop fields, woodland edges, and areas with dense vegetation.
Adults and nymphs are frequently discovered on plants supporting large populations of beetles or caterpillars. Warm, humid environments are particularly suitable for them.
Behavior and Diet
Florida predatory stink bugs hunt caterpillars, beetles, and other slow-moving insects. They sometimes attack prey larger than themselves and may feed together, especially as nymphs. Their strong beak pierces the prey and injects digestive saliva before the internal fluids are consumed.
They can help suppress pest species but should not be handled because the defensive beak can deliver a painful puncture.
Lifespan and Life Cycle
Females lay barrel-shaped eggs in compact rows or clusters on leaves and other plant surfaces. First-stage nymphs remain grouped around the empty eggshells. Older nymphs disperse, although they may continue hunting cooperatively. They pass through five stages before becoming winged adults. Development typically takes 25–60 days, depending on food and temperature. Several generations may occur annually in warm environments, while adults or older nymphs may seek shelter during colder weather.
19. Rough Stink Bug
Rough stink bugs belong to the genus Brochymena, a group of well-camouflaged North American stink bugs. Their bark-like bodies make them difficult to see when resting on trees. Some species feed on plants, while others also prey on caterpillars and beetle larvae, making their overall role in gardens more complex.
Identification
- Adults generally measure 12–17 mm long.
- The body is gray, brown, or mottled with black and white.
- Its upper surface is rough, flattened, and bark-like.
- The body margins are uneven or finely toothed.
- The shoulders are broad and angular.
- Antennae usually have pale and dark bands.
- Nymphs are flattened and may display red, blue, gray, or white markings.
Habitat and Distribution
Rough stink bugs occur throughout much of the United States and southern Canada. They are commonly found in forests, orchards, parks, gardens, and wooded residential areas. Trees and shrubs provide their primary habitat.
Their textured pattern closely resembles tree bark, lichens, and dead wood. Adults often remain motionless on trunks and branches during the day. This camouflage helps them avoid birds and other insect-eating predators.
Behavior and Diet
Many rough stink bugs feed on tree sap, seeds, and developing fruit. Some species also attack caterpillars, beetle larvae, and other slow-moving insects. Because their feeding habits vary, they may be beneficial predators in some locations but minor plant feeders in others.
When threatened, they release a defensive odor, fly away, or press their flattened bodies against bark.
Lifespan and Life Cycle
Adults commonly overwinter beneath loose bark, logs, leaf litter, mulch, and firewood. They emerge in spring to mate, and females place clusters of barrel-shaped eggs on twigs or leaves. Newly hatched nymphs remain near the eggs briefly before dispersing. They develop through several nymphal stages during summer. Many temperate species produce one generation per year. The new adults seek protected overwintering sites during autumn and may survive for several months.
20. Four-Humped Stink Bug
The four-humped stink bug (Brochymena quadripustulata) is a rough-bodied species named for the raised humps on its upper surface. Its mottled gray and brown appearance provides excellent camouflage against tree bark. It feeds on plants but may also consume insects, giving it both plant-feeding and predatory characteristics.
Identification
- Adults usually measure approximately 12–16 mm long.
- The body is mottled gray, brown, black, and cream.
- Four raised humps or bumps appear on the upper body.
- The surface is rough, irregular, and bark-like.
- Body margins have small teeth or jagged projections.
- Antennae may show alternating dark and pale bands.
- Nymphs are flattened and patterned with contrasting colors.
Habitat and Distribution
Four-humped stink bugs are widely distributed across North America. They inhabit deciduous forests, orchards, woodland borders, gardens, parks, and residential areas with mature trees. Adults are commonly found on trunks, branches, fences, logs, and firewood.
Their body texture and coloration allow them to remain almost invisible against rough bark. Occasionally, an adult enters a house after being carried indoors with firewood, but it does not reproduce or cause structural damage inside buildings.
Behavior and Diet
This species feeds on the sap of trees and shrubs, developing seeds, and other plant tissues. It has also been observed preying on caterpillars and beetle larvae. Its mixed feeding behavior means it is not usually considered a serious agricultural pest.
When disturbed, the bug may remain motionless, move to the opposite side of a branch, fly away, or release a strong odor.
Lifespan and Life Cycle
Adults overwinter beneath bark, logs, leaf litter, and similar protected materials. They become active in spring, and females lay small clusters of barrel-shaped eggs on twigs or leaves. The nymphs develop gradually throughout summer, passing through a series of molts before becoming adults. Temperate populations generally produce one generation each year. New adults appear by late summer or autumn and search for winter shelter, where they remain inactive until the following spring.
21. Say’s Stink Bug
Say’s stink bug (Chlorochroa sayi) is a medium-sized green stink bug native to western North America. It resembles Uhler’s stink bug and other green species, so close examination may be needed for identification. It feeds on many crops and wild plants and can occasionally damage fruit, seeds, and developing plant tissues.
Identification
- Adults generally measure 12–17 mm long.
- The body is oval, shield-shaped, and green.
- A pale yellow, cream, or whitish border surrounds the body.
- Three small pale spots may appear at the base of the scutellum.
- Another pale spot is often present near the scutellum’s tip.
- The upper body has a finely punctured or rough texture.
- Adults may turn brownish before or during overwintering.
Habitat and Distribution
Say’s stink bugs occur primarily across western and central North America. Their range includes parts of western Canada, the western United States, and northern Mexico. They live in crop fields, orchards, grasslands, gardens, rangelands, and weedy areas.
Adults often develop on wild plants before moving into cultivated fields or orchards. They may be found on fruit trees, shrubs, grasses, and herbaceous plants that provide seeds or developing fruit.
Behavior and Diet
This species feeds by piercing plant tissue and extracting fluids. Host plants may include wheat, alfalfa, cotton, vegetables, peaches, nectarines, and other fruits. Feeding on young fruit can create dimples, depressions, scars, or corky areas beneath the skin. Feeding on seeds can reduce their size and quality.
Say’s stink bugs usually rely on camouflage but release a defensive odor when disturbed.
Lifespan and Life Cycle
Adults spend winter beneath plant debris, leaf litter, loose bark, or other protected material. They become active as temperatures rise and move to early-season host plants. Females lay clusters of barrel-shaped eggs on leaves and stems. Nymphs develop through five stages, becoming progressively larger and more similar to adults. One or more generations may occur annually, depending on climate. Adults produced late in the year enter a dormant overwintering period.
22. Uhler’s Stink Bug
Uhler’s stink bug (Chlorochroa uhleri) is a green plant-feeding species found mainly in western North America. It closely resembles Say’s stink bug and other green stink bugs. Although it usually lives on wild vegetation, it may enter orchards and crop fields, where feeding can damage developing fruit and seeds.
Identification
- Adults usually measure 10–15 mm long.
- The body is bright green, oval, and shield-shaped.
- A yellow or pale cream border runs around the abdomen.
- Antennae are mostly dark, but the first segment is green.
- The wing membranes are clear or nearly colorless.
- Pale spots at the base of the scutellum are weak or absent.
- A shallow depression may run through the middle of the scutellum.
Habitat and Distribution
Uhler’s stink bugs occur across parts of western Canada and the western United States. They inhabit orchards, crop fields, grasslands, shrublands, gardens, and areas containing broadleaf weeds. They are particularly associated with agricultural regions in the western states.
Wild plants around field margins provide food and breeding habitat. As these plants mature or dry out, adults and nymphs may move into irrigated crops and fruit orchards.
Behavior and Diet
Uhler’s stink bugs extract liquids from developing fruits, seeds, pods, and stems. They may feed on nectarines, peaches, pistachios, almonds, and various field crops. Fruit attacked early in development can become deformed or develop corky tissue beneath the skin. Later feeding may leave small punctures or discolored spots.
The species is capable of flying between host plants and may release an unpleasant odor when threatened.
Lifespan and Life Cycle
Adults typically survive winter beneath leaves, bark, weeds, or crop residue. They emerge in spring, feed, and mate. Females deposit groups of barrel-shaped eggs on the leaves or stems of suitable hosts. Nymphs pass through five stages before developing fully functional wings. Development is fastest during warm conditions. The number of annual generations varies with climate and food availability. In cooler parts of its range, one generation may dominate, while warmer areas can support additional breeding.
23. Red-Shouldered Stink Bug
The red-shouldered stink bug (Thyanta custator) is a native North American species known for the reddish or pink band that may cross its shoulders. It feeds on many plants and is sometimes found in soybean, corn, cotton, fruit, and vegetable crops. Its coloration can change significantly with the season.
Identification
- Adults generally measure 9–13 mm long.
- Spring and summer adults are usually bright green.
- A red or pink band may cross the shoulders.
- The feet and parts of the antennae may appear reddish.
- Autumn adults often become brown or dull green.
- The shoulders are smoothly rounded.
- Nymphs are tan and black with thin reddish lines on the abdomen.
Habitat and Distribution
Red-shouldered stink bugs occur across much of North America, including southern Canada, the United States, and northern Mexico. They inhabit soybean and cornfields, vegetable gardens, orchards, grasslands, weedy borders, and woodland edges.
The bugs frequently develop on weeds and wild plants before moving into crops. They are most noticeable from late spring through autumn when adults and nymphs gather on fruiting or seed-producing vegetation.
Behavior and Diet
This species feeds on developing seeds, pods, fruits, and stems. Common hosts include soybean, corn, wheat, alfalfa, cotton, peach, tomato, and various weeds. Feeding can cause shriveled seeds, misshapen fruit, surface discoloration, and reduced crop quality.
Red-shouldered stink bugs resemble redbanded stink bugs. However, the red-shouldered species lacks the prominent abdominal spine found between the hind legs of the redbanded stink bug.
Lifespan and Life Cycle
Adults overwinter beneath fallen leaves, crop debris, bark, and dense vegetation. They become active in spring and deposit clusters of barrel-shaped eggs on host plants. After hatching, nymphs pass through five stages over several weeks. Two or three overlapping generations may develop annually in favorable regions. Late-season adults often change from green to brown before entering protected overwintering sites. They remain largely inactive until warm spring conditions return.
24. Yellow-Spotted Stink Bug
The yellow-spotted stink bug (Erthesina fullo) is a large plant-feeding species native to Asia. It attacks a wide variety of fruit trees, ornamental plants, and field crops. Because it can gather in large numbers and enter buildings for overwintering, it is considered a significant agricultural and biosecurity threat outside its native range.
Identification
- Adults generally measure 18–23 mm long.
- The body is large, shield-shaped, and blackish-brown.
- Numerous yellow spots and lines cover the upper surface.
- The abdomen has alternating yellow and dark markings.
- The legs show distinct pale bands.
- Antennae have contrasting black and yellowish sections.
- Nymphs are rounded with black, yellow, orange, and reddish patterns.
Habitat and Distribution
Yellow-spotted stink bugs are widely distributed across China, India, Japan, Korea, Southeast Asia, and nearby regions. They live in orchards, forests, farms, gardens, plantations, and urban landscapes. They may also gather on buildings during autumn.
The species can feed on many economically important plants, allowing it to survive in diverse habitats. International movement of cargo and plant products creates a risk of accidental introduction into new countries.
Behavior and Diet
Adults and nymphs pierce fruit, leaves, stems, and seeds to consume plant fluids. Host plants include apple, pear, peach, cherry, citrus, persimmon, kiwifruit, cotton, soybean, and numerous ornamental trees. Feeding may cause fruit deformation, discoloration, premature drop, and reduced market quality.
When disturbed or crushed, the bug releases a powerful defensive odor. Adults are strong fliers and may travel several kilometers after leaving winter shelters.
Lifespan and Life Cycle
Adults emerge from overwintering sites when temperatures rise above approximately 13°C. Females lay clusters of barrel-shaped eggs on host plants. Nymphs pass through five stages before becoming adults. Development from egg to adult averages around 75 days but varies with temperature. Most populations produce one or two generations annually. New adults seek sheltered overwintering locations in autumn and remain inactive until the following spring.
25. Citrus Stink Bug
The citrus stink bug (Rhynchocoris humeralis), also called the citrus green stink bug, is a plant-feeding species associated with citrus orchards in Asia. Adults and nymphs extract fluids from young fruit, flowers, shoots, and leaves. Heavy feeding may weaken trees and cause developing oranges, mandarins, or limes to drop prematurely.
Identification
- Adults generally measure 15–18 mm long.
- The body is green and broadly shield-shaped.
- A prominent spine extends from each shoulder.
- The sides of the abdomen may have several short projections.
- Adults possess long, piercing mouthparts.
- Younger nymphs may be yellow, orange, or green with black markings.
- Older nymphs become mainly green but lack fully developed wings.
Habitat and Distribution
Citrus stink bugs are found in South and Southeast Asia, including parts of India, Nepal, Bhutan, southern China, Thailand, Malaysia, and neighboring regions. They primarily inhabit citrus orchards, home gardens, farms, and areas where wild relatives of citrus grow.
Warm, humid conditions support their development. Adults and nymphs are usually discovered on branches containing flowers, tender shoots, or young fruit. Their green coloration provides effective camouflage among citrus leaves.
Behavior and Diet
Both adults and nymphs pierce plant tissue and consume sap or fruit juices. Feeding on young mandarins and oranges can leave punctures, sunken areas, internal damage, and brown staining. Severely injured fruit may stop developing and fall from the tree.
When threatened, citrus stink bugs release a strong-smelling liquid. The secretion can irritate sensitive skin or eyes, so the insects should not be handled directly.
Lifespan and Life Cycle
Females lay batches of roughly 15 barrel-shaped eggs on citrus leaves, often during the warmer months. Newly hatched nymphs remain close to the eggs briefly before moving onto shoots and fruit. They pass through five developmental stages, gradually becoming greener and developing wing pads. Multiple generations may occur where warm conditions and citrus fruit remain available. Adults survive unfavorable periods in sheltered vegetation and return to active feeding when temperatures rise.
26. Forest Bug
The forest bug (Pentatoma rufipes), also known as the red-legged shieldbug, is a large European stink bug associated with deciduous trees. It primarily feeds on tree sap, fruit, and seeds but may occasionally consume insects. Although common in woodlands, it can become a pest when populations move into commercial fruit orchards.
Identification
- Adults usually measure 12–15 mm long.
- The body is dark brown with a bronze sheen.
- Legs are distinctly orange, reddish-brown, or rust-colored.
- A small orange or cream spot appears at the tip of the scutellum.
- The shoulders are broad, square-cut, and slightly pointed.
- Antennae are dark with reddish basal sections.
- Nymphs are rounded and patterned with brown, green, black, and cream.
Habitat and Distribution
Forest bugs are widespread across Europe and other parts of the Palearctic region. They inhabit deciduous woodlands, forest clearings, hedgerows, parks, gardens, and orchards. Oak is a particularly important host, although the bugs also occur on beech, hazel, alder, and other trees.
Adults are often seen from summer through late autumn. They may enter apple, pear, cherry, and hazelnut orchards located near woodland.
Behavior and Diet
The forest bug feeds by piercing leaves, shoots, seeds, and developing fruit. In woodlands, its feeding usually has little effect on healthy trees. In orchards, however, punctures can cause depressions, discolored patches, malformed fruit, and corky tissue beneath the skin.
It occasionally attacks caterpillars or other soft-bodied insects. Adults can fly and may be attracted to artificial lights at night.
Lifespan and Life Cycle
Unlike many related shieldbugs that overwinter as adults, the forest bug usually spends winter as a second-stage nymph. Nymphs hide in bark crevices and become active in early spring. After three additional molts, they reach adulthood around early summer. Mating occurs during summer, and females place egg clusters beneath leaves. Eggs hatch by late summer, and the young nymphs feed before seeking protected overwintering sites. The species normally produces one generation per year.
27. Hairy Shieldbug
The hairy shieldbug (Dolycoris baccarum), sometimes called the sloe bug, is a widespread plant-feeding stink bug found across Europe and Asia. Its body is covered with fine pale hairs, a feature that separates it from similar brown species. It feeds on numerous flowers, seeds, berries, and other fruits.
Identification
- Adults generally measure 10–14 mm long.
- The body is purple-brown, reddish-brown, or bronze.
- Fine pale hairs cover the upper surface.
- The scutellum is greenish with a pale or yellow tip.
- Antennae have distinctive black and white bands.
- The abdominal border displays a black-and-white checkered pattern.
- Winter adults become duller and more uniformly brown.
- Nymphs are rounded and also covered with fine hairs.
Habitat and Distribution
Hairy shieldbugs are distributed throughout much of Europe, North Africa, and Asia. They occupy hedgerows, woodland edges, grasslands, gardens, scrubland, meadows, and agricultural fields. They are particularly common where berry-producing shrubs and flowering plants are abundant.
In Britain, the species is widespread but tends to become less common toward colder northern areas. Warming temperatures may allow it to expand into new locations.
Behavior and Diet
This species feeds on many plants, including raspberry, blackberry, honeysuckle, sloe, mullein, thistle, nettle, and members of the rose and sunflower families. Adults and nymphs prefer flowers, developing seeds, and ripening fruit.
Feeding punctures may cause small deformed areas or reduce fruit quality. However, the species rarely creates severe garden damage. When threatened, it releases a pungent defensive secretion.
Lifespan and Life Cycle
Adults overwinter beneath fallen leaves, dense vegetation, loose bark, and other sheltered material. They emerge during spring to feed and mate. Females place clusters of brownish, barrel-shaped eggs on host plants. The hairy nymphs pass through five stages and gradually develop wing pads. A new adult generation is generally complete from August onward. Most populations produce one generation annually, and the new adults remain alive through winter before breeding the following spring.
28. Blue Shieldbug
The blue shieldbug (Zicrona caerulea) is a small predatory stink bug with a distinctive metallic blue or blue-green body. Unlike plant-feeding stink bugs, it hunts beetle larvae and other small insects. Its feeding habits make it a beneficial component of grasslands, woodland clearings, heathlands, and gardens.
Identification
- Adults generally measure 5–7 mm long.
- The body is dark blue, blue-green, or metallic purple.
- Its surface is shiny and finely punctured.
- The wing membranes are dark rather than transparent.
- Antennae and legs are uniformly dark.
- The shoulders are smoothly rounded.
- Nymphs are bluish, black, red, or orange and lack developed wings.
Habitat and Distribution
Blue shieldbugs occur across Europe and much of northern and temperate Asia. They are found on low vegetation in heathlands, grasslands, woodland rides, forest clearings, wetlands, gardens, and disturbed areas.
The species is widespread in Britain, particularly in northern regions, although it is absent from some islands and local areas. Adults usually remain close to vegetation supporting populations of leaf beetles and other suitable prey.
Behavior and Diet
Blue shieldbugs prey mainly on the eggs and larvae of leaf beetles. They may also attack small caterpillars and other soft-bodied insects. The bug approaches its prey, inserts its sharp beak, injects digestive saliva, and consumes the liquefied tissues.
Adults and older nymphs actively search leaves and stems for prey. Despite their predatory behavior, they are not dangerous to humans. They may release an unpleasant odor or deliver a defensive puncture if handled.
Lifespan and Life Cycle
Adults spend winter beneath leaf litter, moss, bark, or dense ground vegetation. They become active in spring, and females lay clusters of barrel-shaped eggs on plants. Nymphs pass through five growth stages and begin hunting small prey after the earliest stage. New adults usually appear from July onward and are most noticeable through September. The species generally produces one generation annually. Adults from this generation enter overwintering shelters during autumn and breed the following spring.
29. Gorse Shieldbug
The gorse shieldbug (Piezodorus lituratus) is a colorful plant-feeding stink bug strongly associated with gorse and related legumes. Its appearance changes with age and season: spring adults are mainly green, while newly developed late-summer adults often display purple-red markings. This seasonal variation can make individuals appear like different species.
Identification
- Adults usually measure 10–13 mm long.
- Spring adults are predominantly bright green.
- Late-summer adults develop purple-red or bronze markings.
- A colored band may cross the shoulders and wing covers.
- The body is broadly oval and shield-shaped.
- Antennae may have reddish or darkened sections.
- Adults become darker before overwintering.
- Nymphs are green with black, red, white, or yellow patterns.
Habitat and Distribution
Gorse shieldbugs occur across Europe, North Africa, and parts of Asia. They are common in Britain and Ireland wherever gorse is abundant. Typical habitats include heathlands, coastal scrub, moorland, woodland clearings, roadside banks, grasslands, and gardens.
Although gorse is the principal host, the bugs also live on broom, dyer’s greenweed, laburnum, clover, and other members of the legume family.
Behavior and Diet
Adults and nymphs use their piercing mouthparts to extract fluids from stems, flowers, pods, and developing seeds. They are particularly attracted to gorse seed pods during summer. Feeding may reduce the viability of some seeds but rarely causes serious damage to mature shrubs.
Their green and reddish coloration provides camouflage among gorse leaves, flowers, and seed pods. When disturbed, they may drop deep into the plant or release a pungent odor.
Lifespan and Life Cycle
Adults overwinter in dense vegetation, leaf litter, or beneath plant debris. They become active and mate during spring. Females lay clusters of barrel-shaped eggs on gorse and other host plants. Nymphs pass through five developmental stages while feeding during summer. New adults generally appear in late summer and initially show noticeable purple-red coloration. Most populations complete one generation per year. The new adults darken during autumn before entering protected winter shelters.
30. Green Shieldbug
The green shieldbug (Palomena prasina), also called the common green shieldbug, is a widespread European stink bug. Its bright green summer coloration helps it blend among leaves, while adults turn brown before winter. It feeds on many trees, shrubs, and herbaceous plants but rarely causes significant damage to healthy garden plants.
Identification
- Adults generally measure 12–14 mm long.
- The body is broad, shield-shaped, and bright green in summer.
- The upper surface is covered with fine dark punctures.
- Wing membranes are dark brown or blackish.
- The final antennal segments are reddish-brown.
- Adults turn bronze or dark brown before overwintering.
- The body lacks the three pale spots seen on southern green stink bugs.
- Nymphs are rounded and patterned with green, black, yellow, and white.
Habitat and Distribution
Green shieldbugs are widespread across Europe, North Africa, and temperate regions of Asia. They inhabit woodlands, hedgerows, parks, gardens, meadows, scrubland, and farmland. The species is frequently seen on deciduous trees, shrubs, nettles, and flowering plants.
It has expanded northward in some regions as winters have become milder. Adults may occasionally enter buildings accidentally, but they do not infest houses or damage stored materials.
Behavior and Diet
This species feeds on plant sap, developing seeds, berries, and fruit. Common hosts include hazel, oak, alder, hawthorn, blackberry, raspberry, nettle, and numerous garden plants. Feeding usually causes little visible harm, although large numbers may blemish soft fruit.
Green shieldbugs are slow-moving and rely on camouflage for protection. When disturbed, they may release a pungent odor, fall from the plant, or fly away.
Lifespan and Life Cycle
Adults overwinter beneath dry leaves, ivy, bark, and dense vegetation. Their bodies change from green to brown, helping them blend with winter surroundings. In spring, they become green again, feed, mate, and lay clusters of barrel-shaped eggs on leaves. The nymphs pass through five stages during summer, changing their patterns after each molt. New adults usually appear from August onward. The species generally has one generation annually, with adults surviving until the following breeding season.
31. Spiny Shieldbug
The spiny shieldbug (Picromerus bidens), also called the spiked shieldbug, is a beneficial predatory stink bug. Its most distinctive features are the two sharp, thornlike projections extending from its shoulders. Both adults and nymphs attack caterpillars, sawfly larvae, beetle larvae, and other insects found on vegetation.
Identification
- Adults generally measure 12–14 mm long.
- The body is shield-shaped and light to dark brown.
- Two long, pointed spines extend from the shoulders.
- Legs and antennae are reddish or orange-brown.
- The upper surface may have a bronze or bluish tint.
- The feeding beak is short, thick, and strong.
- Early nymphs are often reddish with dark markings.
- Older nymphs become grayish-black with banded legs and antennae.
Habitat and Distribution
Spiny shieldbugs are widely distributed across Europe and temperate Asia, extending from the British Isles to China. They have also been recorded in parts of North America. Typical habitats include woodland edges, heathlands, chalk downlands, gardens, damp meadows, grasslands, and areas with abundant flowering vegetation.
They are usually found on leaves and stems where caterpillars and other potential prey are active. Adults are most noticeable between July and November.
Behavior and Diet
This species primarily hunts caterpillars and the larvae of sawflies, butterflies, moths, and beetles. It captures prey using its front legs before inserting its strong beak. Digestive saliva is injected into the victim, allowing the bug to consume the liquefied tissues.
Adults and nymphs may occasionally drink plant sap or moisture, but this behavior rarely harms plants. Their predatory diet makes them beneficial in natural habitats and gardens.
Lifespan and Life Cycle
Females lay clusters of eggs on leaves, stems, or tree bark during late summer and autumn. The species normally overwinters as eggs rather than adults. Nymphs hatch during spring and pass through five developmental stages. They become active predators soon after the earliest stage. Adults generally appear during July or August and remain active until November. Most populations produce one generation annually. The adults die after reproduction, leaving the cold-resistant eggs to continue the next generation.
FAQs
What Is the Most Common Stink Bug?
The answer depends on location. Brown marmorated stink bugs are widespread around homes and farms in North America, Europe, and parts of Asia. Green, brown, southern green, and common green stink bugs are also abundant within their respective ranges.
Are All Stink Bugs Harmful to Plants?
No. Many stink bugs feed on plant fluids and can damage crops, but several species are beneficial predators. Spined soldier bugs, two-spotted stink bugs, anchor stink bugs, blue shieldbugs, and spiny shieldbugs consume caterpillars, beetle larvae, and other pests.
Are Stink Bugs Dangerous to Humans?
Stink bugs are not normally dangerous to people. They do not transmit human diseases, and most species avoid contact. However, predatory species can deliver a painful defensive puncture if handled. Their chemical secretions may also irritate sensitive skin or eyes.
Why Do Stink Bugs Enter Houses?
Some species enter buildings during autumn to find dry, protected places for overwintering. Brown marmorated stink bugs are particularly well known for this behavior. They do not reproduce, eat household materials, or cause structural damage while indoors.
How Long Does a Stink Bug Live?
Lifespan varies among species and climates. Development from egg to adult commonly takes four to eight weeks during warm weather. Adults may live for several months. Species that overwinter as adults can survive close to a year when their inactive winter period is included.