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Have a Foreign Grain Beetle Problem?


The Foreign Grain Beetle feeds on fungus and is a most notable nuisance when it invades commercial and residential buildings. The female Foreign Grain Beetle lays her eggs on fungus growing on wood that became wet during construction. Larvae feed on the fungus and do not damage the wood or building structure.

The fungus usually dies in a year or two when the wood naturally dries and adult beetles may come ‘out of the woodwork’ in search of new food sources. If the building is not new, the presence of Foreign Grain Beetles may indicate a plumbing leak or other moisture related problem inside the building.

Foreign Grain Beetles can also be found in flour and cereal mills feeding on fungus or molds on discarded food. If Foreign Grain beetles are found in stored food then mold or fungus is present in the food.


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The foreign grain beetle, Ahasverus advena (Waltl), may have gotten its name by being a pest in grain storage facilities. It is a small insect. The adults range in size from 2 to 3 mm. They are reddish brown in color. When viewed from above, the shell behind the head has rounded projections on the front corners. These projections may be easier to see with a magnifying glass.

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Control Advice

If construction is new, vacuum beetles to prevent them from moving to another location. Inspect older buildings for water leaks and replace moldy wood.

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