Rice Weevil Fact Sheet

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Rice weevil fact sheet Rice weevils are usually found in grain storage facilities or processing plants, infesting 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 too a lesser degree macaroni and spaghetti. Rice weevils do not bite, nor do they damage wood or furniture. Life cycle The adult female rice weevil lays an average of four eggs per day and may live for four to five months (producing 250-400 eggs). A single generation can be completed in around twenty eight days. The eggs hatch in about 3 days. The larvae feed inside the grain kernel for an average of eighteen days. The pupal stage lasts an average of six days (5-16 range). The new adult will remain in the seed for three to four days while it's cuticle hardens and matures. Description Adult weevils are about 3/32 to 1/8 inch long (2-3mm). The adult rice weevil is a dull reddish-brown to black with round or irregularly shaped pits on the thorax and four light reddish or yellowish spots on the elytra (wing covers). The adult weevil can fly and is attracted to lights. The larval stage is legless, humpbacked, and white to creamy white, with a small tan head. The maize weevil is very similar to the rice weevil, but larger. Control Control of these insects involves inspection and removal of infested food products, discarding the heavily infested material, repackaging material in new containers, and vacuuming kitchen cabinets. Products that need to be retained may be placed in the freezer for several weeks to kill adults and larvae. .

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Insect Pests of Stored Grain Blog
Insect Pests of Stored Grain Insect Pest Population Potential • Insects are 1/16 to ½ inch depending on the species. • Large numbers insects in small amounts of debris. • 500 female insects • each female produces 200 offspring • 10 million insects in two generations. Adapted from the Penn State University Agronomy Guide Store Grain Insects Economic Damage • Lose up to 10% of the grain weight in a full storage bin • grain bin containing 30,000 bushels of corn valued at $3.00 per bushel would lose $9,000 • The loss does not include dockage or the cost of eliminating the insects from the grain. Adapted from the Penn State University Agronomy Guide Sampling for Bugs Looking for Bugs Docking screens can be used to separate beetles from the grain. Primary Stored Grain Feeders in NYS Weevils • Granary Weevil • Rice Weevil • Maize Weevil Beetles • Lesser Grain Borer Moths • Angoumois grain moth Weevils Have Snouts! Snout No Snout Gary Alpert, Harvard University, Bugwood.org Gary Alpert, Harvard University, Bugwood.org Maize Weevil Lesser Grain Borer Granary weevil Sitophilus granarius (L.) • polished, blackish or brown. • 3/16 of an inch long • no wings • Not in the field • longitudinal punctures- thorax • 80-300 eggs laid • One egg per grain kernel • corn, oats, barley, rye, and wheat Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org Rice Weevil (Sitophilus oryzae) • 3/32 of an inch. • reddish brown to black • Small round pits-thorax • Has wings with yellow markings • Lays 80-500 eggs inside of grain • One egg per grain kernel • Start in the field • wheat, corn, oats, rye, Joseph Berger, Bugwood.org barley, sorghum, buckwheat, dried beans Maize Weevil Sitophilus zeamais • Very similar to rice weevil • slightly larger • 1/8 of an inch long • Small round pits on thorax with a mid line.
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Diatomaceous Earth As Insecticide Rice Weevil
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Rice Weevil,Sitophilus Oryzae
ENY261 Rice Weevil, Sitophilus oryzae (Coleoptera: Curculionidae)1 P. G. Koehler2 Appearance Habits The rice weevil (Figure 1) is small, 1/10 inch (2 to 3 mm) and The rice weevil is one of the most serious stored grain pests stout in appearance. It is very similar in appearance to the worldwide. This pest of whole grain originated in India granary weevil. However, the rice weevil is reddish-brown and has been spread worldwide by commerce. It now has a to black in color with four light yellow or reddish spots on cosmopolitan distribution. It is a serious pest in the south- the corners of the elytra (the hard protective forewings). ern United States. The rice weevil is replaced by the granary The snout is long (1 mm), almost 1/3 of the total length. weevil north of North Carolina and Tennessee. Both the The head with snout is as long as the prothorax or the adults and larvae feed on whole grains. They attack wheat, elytra. The prothorax (the body region behind the head) corn, oats, rye, barley, sorghum, buckwheat, dried beans, is strongly pitted and the elytra have rows of pits within cashew nuts, wild bird seed, and cereal products, especially longitudinal grooves. The larva is legless and stays inside macaroni. The adult rice weevil can fly and is attracted to the hollowed grain kernel. It is fat with a cream colored lights. When disturbed, adults pull in their legs, fall to the body and dark head capsule. ground, and feign death. The larval rice weevil must com- plete its development inside a seed kernel or a man-made equivalent, like macaroni products.
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Rice Weevil (Pantry Pest)
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