Pea and bean weevil overwinters as adult beetles that hide away in leaf litter and other sheltered places. Bean weevils can grow to about 1 mm to 2 mm. The adults do not require food or water and spend their limited lifespan (one – two weeks) mating and laying eggs on beans. After pupation within the seed, the adult chews an exit hole through the seed coat. Caption: Pea and bean weevil make characteristic notching round the leaf edges ... Eggs are laid around plants from April until July. The larval stage of the weevil pests of dry beans tunnel and develop within bean seeds. Q When should I expect pea and bean weevil attacks? These pests are most troublesome in late-planted crops and can quickly decimate an entire row of beans. Traditional methods of protecting stored grain include using the insecticidal properties of Insects are a major factor in the low yields of African cowpea crops, and they affect each tissue component and developmental stage of the plant. Larvae develop in growing or stored bean seeds. Watch for their yellow, fuzzy larva and yellow eggs, and destroy them, as well. An individual bruchid can lay 20–40 eggs, and in optimal conditions, each egg can develop into a reproductively active adult in 3 weeks. They may consume nearly the entire bean contents. In bad infestations, insect pressure is responsible for over 90% loss in yield.Besides biotic stresses, cowpea also faces various challenges in different parts of the world such as drought, heat, and cold.Cowpeas are grown mostly for their edible beans, although the leaves, green seeds and pods can also be consumed, meaning the cowpea can be used as a food source before the dried peas are harvested.Cowpea seeds provide a rich source of proteins and calories, as well as minerals and vitamins.The cowpea has often been referred to as "poor man's meat" due to the high levels of protein found in the seeds and leaves.Most cowpeas are grown on the African continent, particularly in Nigeria and Niger, which account for 66% of world cowpea production.Outside Africa, the major production areas are Asia, This appears to be one of the latest taxonomical classifications Damage. The larval and pupal stages are spent inside the bean. Bean weevil: eggs laid loosely among beans or through cracks in the pods; The larval and pupal stages are spent inside the bean. This species also is known as the southern cowpea weevil. Bean weevil – They are not true weevils though.
The The location of eggs varies depending on the weevil:The larval and pupal stages are spent inside the bean. Although their mandibles may be elongated, they do not have the long snouts characteristic of true Adults deposit eggs on seeds, then the larvae chew their way into the seed. The broad bean weevil does not damage stored beans. Eggs per bean 0 1 2 Observed 664 696 32 Poisson 806.4 440.2 145.3 Mean weight of beans (mg) 50.0 55.2 57.8 The high mortality in beans with more than one egg increases the selective advantage gained by fe-males that avoid putting a second egg on a bean.
This species also is known as the southern cowpea weevil. The larvae are creamy white legless grubs with pale brown heads. Eggs are laid around plants from April until July. Watch for and control weevils and other insect pests in storage operations to prevent insect infestations in stored products. The seeds can be harvested after about 100 days or the whole plant used as forage after about 120 days.