Grain Beetles

Two species common in Maine are the sawtoothed (Oryzaephilus surinamensis) and the merchant (Oryzaephilus mercator) grain beetles. They are common household insect pests. Adults and larvae feed on stored animal and vegetable products. Found on grains, flour, sugar, pasta products, cereals, nuts, and dried fruit.

sawtoothed grain beetle
Sawtoothed grain beetle.

sawtoothed grain beetle
Sawtoothed grain beetle.

merchant grain beetle
Merchant grain beetle.

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Identification and Control Information

[Photos, left to right: Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org; Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org; Gary Alpert, Harvard University, Bugwood.org]