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Lesser grain borer (Rhizopertha dominica)


The neck plate of this approx. 3 mm long, dark brown to black beetle is drawn up over the head like a hood. The feelers, ending in a tripartite club, are visible. The females lay their eggs on cereal grains. Both larvae and beetle feed on grain, leaving irregular holes of differing size. Older larvae bore into the grains and pupate there. This beetle species is best adapted to warmer temperatures and was accidentally introduced here.


The lesser grain borer causes damage by feeding on grain, grain products, baked goods, legumes, herbal drugs, etc. The nutrient substrate emits a honey-like odour when infested. These beetles can also damage packaging materials by boring into them.