Sawtoothed Grain Beetles
Stored Product Pest
here for photo ęBastiaan (Bart) Drees, Extension Entomology, Texas A&M University
SAWTOOTHED GRAIN BEETLE
The adults, (the ones you usually see) are small, thin, dark brown insects less than a quarter inch long. Sawtoothed grain beetles are major pests in factories, homes and granaries. They feed on a very wide variety of products, flour, bread and cereal products,
macaroni, dried fruits, nuts, sugar and even improperly cured meats. They are named primarily because of the six sawtooth-like teeth found on the two sides of the first segment behind the head, the pronotum.
Sawtoothed Grain Beetles are very small, flat insects that easily hide in the cracks and crevices of food packages, can penetrate the packaging and infest the product inside. An adult female will lay, over her lifetime, almost 300 shiny white eggs in the food they are infesting.
Eggs hatch into tiny, yellow-white larvae, about an eighth of an inch long, and have three pairs of legs and a false pair. A larva will molt as many as four times, and depending on conditions, will complete this cycle in slightly less than a month. If conditions are not ideal, that cycle could take almost a year.
Sawtoothed Grain Beetles can develop into very large populations in stored food products, and the first sign you usually see, are the adults crawling all over your cabinets. Adults feed on the same materials as the larvae, so they can keep on going, right there in your pantry.
Stored food/pantry/product pest
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