In late summer and early fall, samples come into the lab of a tiny reddish brown beetle called a foreign grain beetle. They feed on mold and organic matter and are often attracted to new constructions. They are small enough to get through most screening and can be seen flying around inside. We speculate the high moisture levels from green lumber may grow small amounts of mildew in the walls. The insects are harmless and will disappear one the heating season starts.This article was posted in Beetles.
Department of Entomology