Primary-pest
Guides
Rhyzopertha dominica
Lesser Grain Borer, American Wheat Weevil, Australian Wheat Weevil, Stored Grain Borer
Rhyzopertha dominica, the lesser grain borer, is a monotypic species in the family Bostrichidae and one of the most destructive pests of stored cereal grains worldwide. It is particularly damaging to wheat, but also infests corn, rice, sorghum, peanuts, and other stored products. The beetle is known for its ability to bore directly into intact kernels, causing both quantitative weight loss and qualitative degradation through contamination. Its global distribution in grain storage facilities makes it a major target of integrated pest management programs, with populations showing increasing resistance to phosphine fumigants and other chemical controls.
Sitophilus granarius
granary weevil, wheat weevil, grain weevil
Sitophilus granarius is a cosmopolitan pest of stored cereals, commonly known as the granary weevil or wheat weevil. Adults are flightless and infest raw grains including wheat, barley, and oats, causing significant quantitative and qualitative losses in storage facilities. The species is distinguished from similar storage weevils by its inability to fly and its preference for cooler, drier conditions. Larvae develop endophytically inside grain kernels, completing their entire immature life cycle within a single seed.