Worldwide distribution. On rice, maize, sorghum, wheat, cassava, and other stored products. Important weevil.
Destructive: attacks sound grains, leaving large cavities, allowing secondary invasions by insects, mites, and fungi.
Eggs laid into holes chewed in grain, and then plugged. Larvae feed inside the grain, and pupate there. Adults, up to 4 mm, reddish-brown to black with four light-reddish to yellowish spots on the wings.
Spread with movement of stored grain; the weevil is not a strong flyer.
Cultural control: harvest at maturity; dry to 12%; keep storage rooms and areas clean; spray bins, and use new sacks; if infestations occurs, locate and treat: if small - sieve, freeze or wrap in plastic and bury; if large, fumigate. Store small amounts of grain in plastic containers.
Chemical control: consult full fact sheet for details; always check whether the product is for treating equipment, bins and buildings or for treating grain for human use and animal feed. READ THE INSTRUCTIONS.