Silvanid-beetle
Guides
Ahasverus advena
Foreign grain beetle
Ahasverus advena, commonly known as the foreign grain beetle, is a small silvanid beetle approximately 2 mm in length with a reddish-brown to black coloration. It is a cosmopolitan species of American origin now reported from 110 countries, where it occurs in stored products facilities and diverse outdoor habitats. The species is uniquely adapted to fungal feeding, with larvae capable of developing on fungi alone and elevated tolerance to aflatoxins compared to other stored product beetles. It serves as an indicator of damp, moldy conditions rather than a direct pest of grain, as it does not feed on intact grain kernels but rather on associated fungal growth.