Bean weevil larvae feed mostly inside beans. These weevils attack all legumes, including kidney beans, green beans, peas and lentils. Heavily infested peas are often reduced to shells.

Lifecycle usually lasts 2-4 months. The larvae feed within the beans as they mature. The larval stage can take from a few weeks to many months to complete, depending upon temperature and moisture of the bean. Pupation is within the bean. Circular holes are cut for the adult to emerge. Development and breeding goes on as long as there is any food left in the bean and the temperature is right (warmer temperatures are preferred).

They mainly infest corn, cocoa, coffee beans, dried fruits, nutmegs, ginger etc. The beetle flies to fields and lays its eggs on damaged cobs. The larvae bore into coffee beans in which they pupate.

The Granary Weevil is among the most destructive of all stored grain insects. The larvae develop inside kernels of whole grain in storage. This makes an infestation difficult to remove in the milling process.

Most of their life is spent within the grain kernel. Both larvae and adults feed on grain. Grain weevils will also attack hard cereal products, e.g. macaroni and spaghetti.

The egg, larva, and pupa stages of these weevils occur in the grain kernels and are rarely seen. Emergence holes of the granary weevil are fairly large and tend to be more ragged than smooth and round. Females drill a tiny hole in the grain kernel, deposit an egg in the cavity, then plug the hole with a gelatinous secretion. The life cycle is about 30 to 40 days during the summer, and 123 to 148 days during the winter, depending on temperature.

Also known as the Greater Rice Weevil. Maize Weevils are frequently regarded as primary pests of grain since they are able to infest otherwise undamaged grain. They have also been seen to infest buckwheat, peas, acorns, chestnuts and cottonseed.

Both larvae and adults will feed upon grain. Weevil-damaged grain can be readily recognised by the presence of large holes which are the exit holes of the emerging adults.

The egg, larva, and pupa stages of these weevils occur in the grain kernels and are rarely seen. Females drill a tiny hole in the grain kernel, deposit an egg in the cavity, then plug the hole with a gelatinous secretion. The egg hatches into a young larva which bores toward the center of the kernel, feeds, grows, and pupates there. New adults bore emergence holes from the inside, then leave to mate and begin a new generation.

The rice weevil adults can feign death by drawing up their legs close to the body, falling, and remaining silent when disturbed. Emergence holes of the rice weevil are smaller than those of the granary weevil, and tend to be smooth and round. There is generally no external evidence that the larvae have been eating and growing inside the seed until after about one month when the adult weevil chews through the seed coat and emerges.

The adults live 3 to 6 months, infesting grain in the field. The egg, larva, and pupa stages of these weevils occur in the grain kernels and are rarely seen. Females drill a tiny hole in the grain kernel, deposit an egg in the cavity, then plug the hole with a gelatinous secretion. The egg hatches into a young larva which bores toward the center of the kernel, feeds, grows, and pupates there. New adults bore emergence holes from the inside, then leave to mate and begin a new generation. Female rice weevils lay between 300 to 400 eggs, with the life cycle requiring about 32 days for completion. Two larvae can develop in one wheat kernel.