Adult rice weevils, Sitophilus oryzae (Coleoptera: Curculionidae), are close relatives to grain weevils and maize weevils and are often confused with either or both. They are about 3/32 to 1/8 inch long (2-3mm) as adults with a dull reddish-brown to black color pattern. Their distinct feature is four orange/red spots on the back wing coverings (elytra). The elytra are also strongly pitted and have rows of pits within longitudinal grooves running along the coverings. The adult weevil can fly and is attracted to lights (a primary way to tell that it’s NOT grain weevil). The larval stage is legless, humpbacked, white to creamy white, with a small tan head. The maize weevil is very similar to the rice weevil, but larger.
The adult female rice weevil lays an average of 4 eggs per day and may live for four to five months (producing 250-400 eggs). A single generation can be completed in around 28 days. The eggs hatch in about 3 days. The larvae feed inside the grain kernel for an average of 18 days. The pupal stage lasts an average of 6 days (5-16 range). The new adult will remain in the seed for 3 to 4 days while its cuticle hardens and matures.
How Did I get rice weevils
Rice weevils are usually found in grain storage facilities or food warehouses and processing plants. They commonly infest wheat, oats, rye, barley, rice, and corn. Although not often found in the home, they are sometimes found infesting beans, birdseed, sunflower seeds, dried corn, and to a lesser degree macaroni and spaghetti. If you’re storing or processing any of these items, you’ve got what attracts rice weevils.
What Problems Do rice weevils Cause
Rice weevils do not bite, and they don’t damage wood or furniture. But boy can they damage some product! Food processing plants that deal with wheat, oats, rye, barley, rice, and corn (just to name a few) know how rice weevils can damage these items in a short period of time. The major problem rice weevils cause is the loss in revenue from spoilage and loss of contracts from shipping infested products.
HOW do i get rid of rice weevils
Control of these rice weevils involves inspection and removal of infested food products, discarding the heavily infested material, repackaging material in new containers, and vacuuming the area. Products that need to be retained may be placed in the freezer for several weeks to kill adults and larvae for smaller home infestations. But, for larger areas and food processing or silos, fumigation will be the best way to eliminate rice weevils.