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Controlling Larder Beetles

Source: NDSU Extension Service Entomologist

Larder beetle larvae are quite distinct and easily distinguished from other insects found in the home. They are fuzzy, reddish-brown, worm-like creatures. Under a magnifying glass you can see two dark spines on the tall end. These spines separate it from the carpet beetle larvae, another destructive household pest.

Larder beetles are harmless creatures, but can cause considerable concern when found in homes. Other than being a nuisance, larder beetle larvae do not harm structures or household furnishings. Fully grown, larder beetle larvae are about one-half inch long.

Larder beetle larvae feed on a variety of high-protein foods. Dry pet food can be a common source of infestation. Therefore, these containers should be kept tightly sealed or enclosed in a plastic bag with a twist-em. They are excellent scavengers, eating dried meats of all types, dead insects and even dead animals such as mice or squirrels that may be trapped between walls or in attics.

When these food sources are gone, they move out to look for more. This is when you probably first notice them.

The larva develops into a pupa, then to an adult. Larder beetle adults are oval, about one-fourth inch long and black with two dark tan markings on the middle of the wing covers. Since they are attracted to light they are often found around windows and light fixtures. Adult are harmless.

If you have further questions, please contact your county office of the NDSU Extension Service.

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