Finding small beetles in your rice, flour, or cornmeal is unpleasant at best. Weevils are one of the most common stored-product pests in American households, and their elongated snout makes them among the easiest pantry pests to identify. Several species infest stored foods in Midwest homes, with the grain weevil, rice weevil, and bean weevil being the most frequently encountered. Understanding which species you’re dealing with and where they came from is the first step to getting rid of them.

What Weevils Look Like

All weevils share a characteristic elongated snout (called a rostrum) that projects forward from the head — this is their definitive ID feature. Most common household weevils are small, ranging from 1/8 to 1/4 inch long. Color is typically dark brown to reddish-brown or black. The grain weevil and rice weevil are nearly identical in size and color, though the rice weevil has four faint reddish or yellowish spots on its wing covers. The bean weevil is more oval-shaped with a shorter snout and mottled brown-and-gray coloring.

Common Weevil Species in the Midwest

Grain Weevil (Sitophilus granarius): Infests whole wheat kernels, corn, oats, barley, and rye. Cannot fly. Reproduces entirely inside grain kernels.

Rice Weevil (Sitophilus oryzae): Similar to grain weevil but can fly and is found in a wider range of products including rice, corn, wheat, and pasta. Common across the Midwest.

Bean Weevil (Acanthoscelides obtectus): Infests dried beans, peas, and lentils. Often introduced with homegrown or bulk dried legumes.

How Weevils Develop

Weevils have a distinctive development pattern: females chew a small hole into a grain kernel, deposit an egg inside, then seal the hole with a waxy secretion. Larvae develop completely inside the kernel — eating it from within — then emerge as adults. By the time you see adult weevils walking around your pantry, a significant infestation has already occurred inside the grain you can’t see.

How They Enter Your Home

Weevil infestations almost always begin with an infested product purchased from a grocery store, bulk food retailer, or farm supply store. Eggs and larvae inside grains are invisible without magnification. Once the infested product reaches your pantry, adults emerge and spread to adjacent products, especially those stored in paper bags or thin plastic packaging.

Signs of an Infestation

  • Small dark beetles with a visible snout in grain, rice, or flour
  • Holes in individual grain kernels
  • Fine powder or debris in or around food packages
  • A musty or sour smell in affected products
  • Larvae inside kernels when broken open

Eliminating Weevils

Remove all items from your pantry and inspect every package. Discard infested products in a sealed outdoor trash bag. Vacuum shelves and pantry corners, then wipe down all surfaces. To salvage suspect products, freeze them at 0°F for at least four days to kill all life stages.

Going forward, store all dry grains, legumes, and flour in airtight glass or metal containers. Avoid storing large quantities of bulk grains for extended periods. Check newly purchased products before putting them in your pantry.

When to Call a Professional

If weevils persist after a thorough pantry cleanout, the infestation may have spread to areas you can’t easily inspect or treat — wall voids, behind appliances, or into decorative grain products. Miller Pest Solutions helps homeowners in Des Moines, Omaha, and Kansas City resolve persistent pantry pest problems. Call for a free phone bid: Omaha (402) 769-0997 | Des Moines (515) 329-8801 | Kansas City (816) 815-0498