Rice weevils are an “internal” feeder, obliged to feed as larvae only within whole, unbroken grains, such as wheat, rice, corn, or other seeds. Bird seed in structures sometimes supports these pests, and hard processed products such as pet food nuggets or dry pasta also may suffice. Both adults and larvae feed on these foods, and adults also have been observed feeding on fruit. Adult rice weevils can fly. Adult females live about 5 months, laying up to 400 eggs in that time. She chews a small hole in the kernel or grain and deposits an egg, which she then covers with a film of gelatinous fluid. The larvae remain feeding within the grain for as little as one month in warm conditions.
Inspection to determine the location of infested products is important, and usually disposal of this infested material is done. Fumigation with methyl bromide or aluminum phosphide is routinely done to ensure clean, uninfested product is put into storage in commercial facilities. Monitoring with pheromone traps will help to determine if adult activity is beginning.