A weevil is a type of beetle whose mouthparts are formed into a long snout, with one antenna on either side of it. The snout is used not only for feeding but also for making cavities in buds, fruits, seeds, stems, and roots of plants, where eggs are laid. When the weevil larvae emerge, they feed within the plant. There are 60,000 species of weevils, all of which are herbivorous and most of which are less than ¼ ” long. The species of weevil in the photograph was on many of the black-eyed Susans that were blooming in an unmowed field, and all of them appeared to be feasting on pollen. Many weevils are pests of plants such as cotton, alfalfa and wheat. You may have even found them inside your house devouring your cereal or flour.
The long-beaked insects known as weevils are actually a type of beetle. Weevils are chewing insects and their mouth parts or mandibles are located at the very tip of their snout. They use this beak to drill through the shells of nuts, fruits, bark and other plant parts so that they can feed on the softer material within. Female weevils also insert their eggs deep into plant tissues using these same drill holes. Some weevils are considered pests of the plants (white pine, spruce, alfalfa and strawberries, among others) they eat and lay eggs in. The majority, however, are innocuous, and some even eat plants like dandelions, purple loosestrife and other plants generally considered to be weeds in the Northeast.