This is the most important insect that damages alfalfa.
In South Carolina if alfalfa weevils are not controlled, no alfalfa is produced. Damage is caused primarily by the larvae. The winter is passed in the adult and egg stages. Adults are found in such places as ditch banks or in the crowns of alfalfa.
In late fall and early spring the female weevil begins laying eggs. All eggs hatch in early spring. By the time the alfalfa is about 6 inches tall, damage is easily noticeable. The larvae feed on the leaves. In a heavy infestation the entire field may appear white from leaf loss.
Usually there are two generations each year. When the weather becomes warm in June or later, the adult weevil leaves the field and looks for a protective place to stay until early fall. With the coming of cold weather, the adult weevils become active again and some may lay eggs before winter.
