Rice water weevil infesting rice fields

Adults are grayish-brown weevils (1/8 inch long) with a dark brown V-shaped mark on their back. Adults fly into rice fields and begin feeding on the leaves of rice plants. Male and female RWW adults mate, then females deposit eggs in the leaf sheath at or below the waterline. White larvae emerge from eggs in about one week and develop through four instars while feeding on rice plant roots. Larvae pupate in cocoons that are covered with a compact layer of mud and are attached to rice roots. The life cycle from egg to adult takes about one month.