Yellow mealworm biology & life cycle
Larvae overwinter in stored grain and pupate in late spring or early summer. Females lay eggs within spaces between the stored grain. Larvae emerge 3-7 days later and begin feeding. Mature larvae wander off to pupate and no cocoon or protective covering is formed. There is one generation per year, but with poor conditions development can take two years. Adults and larvae prefer grain that is damp or decaying or milled cereal products. Adults are present year round and cause little damage; full grown larvae can cause damage to whole kernels of grain.
