Serving the North and South Shore of Massachusetts 978-683-4333
Size: 1/8 inch in length
Color: The rice weevil is dark brown and usually has four light-colored patches on its wing covers. The granary weevil is uniformly dark brown in color.
About Rice Weevil Infestations
Both the rice and the granary weevil are internal feeders and the larva develops inside whole grain kernels. The female weevil bores a small hole into a grain kernel and deposits a single egg into the hole. She seals this hole with a gelatinous material and then repeats the process on kernel after kernel until she deposits 300-400 eggs. As a general rule, however, about 50% of the eggs do not hatch. The "C" shaped, creamy white, legless larva emerges from the egg and completes its life feeding within the kernel. The kernel will eventually be hollowed out and the larva pupates within.
After pupation, the adult beetle remains inside the kernel for a while before chewing its way out. The open, round exit holes are sign of a weevil infestation. Weevil exit holes differ from the exit holes created by the grain moth because they are open. The moth leaves a little, hinged "lid" over the hole. Within infested grain, the size of the weevils seen can vary greatly. A weevil’s size is dependant on the size of the grain kernel in which the larva developed. Rice weevils are prolific breeders and can build up huge populations in stored grain to the point where the grain has little value as a food product.
Infestations located in storage bins, silos and grain elevators have been found to a depth of about 5 feet. The grain deeper than that is usually too warm to support the weevils’ survival. When disturbed, both types of weevil "play dead" by drawing their legs close to the body. They then lie still for several minutes before resuming movement. The granary weevil does not fly while the rice weevil is an active flier. It often flies to grain storage bins and buildings from nearby fields and from one end of a warehouse to the other.
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