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Home > Bugs > Bugs of Homes and Structures > Mealworms

Mealworms

Dark Mealworm—Tenebrio obscurus

Yellow Mealworm—Tenebrio molitor

Mealworms are common, widespread insects that occasionally infest stored products. Usually found in undisturbed areas such as dark corners, under sacks, and in bins where feed is stored. In homes they are sometimes found in cornmeal, flour, cake mixes, and cereals.

mealworm larva mealworm larva mealworm adult
Larvae are elongate and cylindrical (worm-like), hard-bodied and yellow to golden brown in color. (Yellow mealworm larvae) Larvae and adults are usually found in moist, dark, undisturbed places. (Dark mealworm larva) Adults are nocturnal, black, hardshelled beetles about 1 inch long. (Yellow mealworm adult)

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Identification and Control Information (each will open in a new window)

[Photos: Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org]

 
It is the policy of the State of Maine to minimize reliance on pesticides. The Maine Department of Agriculture and the Maine IPM Council encourage everyone to practice integrated pest management and to use pesticides only as a last resort. The mention of pesticides in the fact sheets linked to these pages does not imply an endorsement of any product. Be sure that any product used is currently registered and follow all label directions.