Watch Video on damage caused by Leaf-footed bugs!
Introduction
Leaf-footed bugs (Leptoglossus spp.) are sap-feeding insects (Photo 1) that can damage a wide range of garden plants, fruit crops, and nut trees. These pests belong primarily to the family Coreidae and are recognized by their elongated bodies, piercing-sucking mouthparts, and characteristic leaf-like expansions on their hind legs. Although leaf-footed bugs are often noticed on ripening tomatoes and other fruits, they can also attack developing vegetables, seeds, nuts, and plant shoots. Their feeding can cause discoloration, deformities, premature fruit drop, and reduced crop quality. Understanding how leaf-footed bugs damage different crops can help gardeners and growers detect infestations early and protect their plants.
What are leaf-footed bugs?
Leaf-footed bugs are true bugs that use piercing-sucking mouthparts (Photo 2) to obtain plant fluids. Common species include several members of the genera Leptoglossus and Acanthocephala. Young nymphs of leaf- footed bugs are bright orange, red or reddish- brown whereas adult leaf- footed bugs are usually brown or gray and have distinctive leaf-like expansions on their hind legs. Adults and nymphs may feed on a variety of plant parts, including developing and ripening fruits, vegetable pods, beans, seeds and nuts, flower buds and succulent shoots.
How do leaf- footed bugs cause damage?
Leaf-footed bugs insert their slender mouthparts into plant tissues and suck out fluids. During feeding, they may inject saliva containing enzymes that help them access plant contents. Their feeding can injure plant cells and tissues around the feeding site. In fruits and seeds, this damage may remain visible as spots, discoloration, or internal tissue injury (see below).
1. Damage to tomatoes
Tomatoes are among the crops commonly attacked by leaf-footed bugs, especially when fruits are developing and ripening. Leaf-footed bugs pierce tomato fruits (photo 1) with their mouthparts and feed on the fluids inside. Their feeding can cause pale or yellowish spots on the fruit surface, firm, sunken, or hardened areas as the fruit develops, discolored tissue beneath the feeding site, uneven ripening and reduced fruit quality. On green tomatoes, feeding damage may initially appear as small, pale spots. As the fruit matures, these areas can become more noticeable and may remain firm compared with the surrounding ripe tissue The damaged fruit may also develop an unpleasant taste or texture. Infestations may become more noticeable when tomatoes begin to develop fruit and during the ripening period. Leaf-footed bugs can also feed on stems and other plant parts, although fruit damage is often the primary concern for gardeners.
2, Damage to peppers
Leaf-footed bugs may also attack sweet peppers, hot peppers (Photo 3), and other pepper varieties. When bugs pierce developing pepper fruits, they may cause small discolored feeding spots, sunken or hardened areas, internal tissue damage, reduced marketability and premature fruit drop in severe cases Damage may be more difficult to notice on peppers with thick or irregularly colored skin. Cutting open affected fruits can sometimes reveal tissue discoloration beneath feeding sites. Repeated feeding may reduce the quality of peppers, particularly when fruits are harvested for fresh consumption.
3. Damage to beans
Leaf-footed bugs can feed on beans and other legumes, particularly on developing pods and seeds of green beans, lima beans, cowpeas (Photo 4) and soybeans. Their piercing-sucking mouthparts may penetrate pods and developing seeds, resulting in shrivelled or poorly developed seeds, discolored seed surfaces, reduced seed quality, deformed pods and lower seed viability. When bugs feed on immature seeds, the developing seed may fail to fill properly. This can reduce the quality of beans grown for fresh consumption or seed production.
4. Damage to cucumbers, squash and melons
Leaf-footed bugs may feed on several cucurbit crops, including cucumbers, squash, pumpkins, and melons. Although these crops can also be attacked by other pests, leaf-footed bug feeding may cause injury to developing fruits and seeds. Possible damage includes small puncture marks, discolored or sunken areas, deformed developing fruits, internal tissue injury and reduced fruit quality.
5. Damage to peaches, nectarines, and other stone fruits
Leaf-footed bugs are important pests of several fruit trees, particularly in regions where suitable species are abundant. They may attack peaches, nectarines, plums, and other stone fruits. When bugs feed on developing fruit, they may cause small depressed spots, discolored areas beneath the skin, deformed fruit growth, internal tissue damage and premature fruit drop. Feeding on young fruit can sometimes interfere with normal fruit development. Damaged areas may remain visible as the fruit enlarges. On mature fruit, feeding may result in localized discoloration or tissue breakdown. Young fruits are particularly vulnerable to cosmetic damage because injury early in development may become more noticeable as the fruit grows. Even when the damage is limited to a small area, it can reduce the fruit’s appearance and market value.
6. Damage to citrus fruits
Some leaf-footed bugs may feed on citrus fruits, including oranges, lemons, grapefruits, and other citrus varieties.Possible symptoms include small puncture marks, discolored areas on the fruit, localized tissue injury, premature fruit drop and reduced fruit quality. Feeding damage may be more difficult to identify on citrus because the outer rind can hide injuries beneath the surface.
7. Damage to almonds and other nut crops
Leaf-footed bugs can be particularly concerning in nut-producing crops because they may attack developing nuts before the shells and kernels fully mature. Potentially affected crops include almonds, pistachios, pecans (Photo 5) and walnuts. Leaf-footed bugs may pierce developing nuts and feed on their contents. This can result in kernel discoloration, poor kernel development, shrivelled kernels, internal tissue damage and reduced nut quality.
8. Damage to grapes
Leaf-footed bugs may occasionally feed on grapes, especially when fruits are developing or ripening. Feeding may cause small puncture marks, discolored berries, localized tissue damage and reduced fruit quality.
Natural ways to reduce leaf-footed bug damage
An integrated pest management approach can help reduce leaf-footed bug populations while protecting beneficial insects.
1. Monitor plants frequently: Inspect crops regularly for adults, nymphs, eggs, and feeding damage. Early detection makes it easier to remove small infestations.
2. Remove bugs by hand: In home gardens, adults and nymphs can often be collected manually and placed in a container of soapy water. Wear gloves if preferred, and avoid crushing bugs directly on plant surfaces because some true bugs can release unpleasant odors.
3. Remove weeds and plant debris: Some leaf-footed bugs use weeds, wild plants, and plant debris as shelter or food sources. Removing unnecessary vegetation around crop areas may reduce suitable hiding places, although beneficial insects and wildlife should also be considered.
4. Use physical barriers: Row covers and insect netting may help protect vulnerable crops when applied correctly. Make sure the covering is installed before pests reach the plants, and provide adequate ventilation and pollination access when needed.
5. Encourage natural enemies: Several predators and parasitoids may attack leaf-footed bugs or their eggs. Natural enemies can help suppress pest populations, although their effectiveness varies by species and environment. Potential natural enemies include:
- Spiders
- Assassin bugs
- Predatory stink bugs or soldier bugs (Photo 6)
- Birds
- Certain predatory insects
- Egg parasitoid wasps
6. Reduce nearby pest habitat: Managing heavily infested weeds and unnecessary vegetation near crops may help reduce pest movement into gardens. However, avoid removing flowering plants indiscriminately because they may support pollinators and beneficial insects.
Conclusion
Leaf-footed bugs can damage a wide range of crops by piercing plant tissues and feeding on plant fluids. Their feeding may leave spots on tomatoes and peppers, injure developing fruit, reduce seed quality, and damage kernels in nut crops. Crops such as tomatoes, beans, peaches, almonds, pomegranates, cucurbits, and grapes may be affected, depending on the leaf-footed bug species present. Regular monitoring, accurate pest identification, physical removal, habitat management, and protection of natural enemies can help reduce crop damage. By recognizing feeding symptoms early, gardeners and growers can take timely action to protect developing fruits, seeds, and harvest quality.