Pest Identification

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Saw-Tooth Grain Beetle Exterminator

Saw-Tooth Grain Beetle

Saw-Tooth Grain Beetle

Description:
Adult saw-toothed grain beetles are small, slender, dark brown, flat insects about 1/8-inch long.  Their most distinguishing characteristic is the six saw-like teeth found on either side of the pronotum (first segment behind the head). The larvae are yellow-white and about 1/8-inch long. They have three pairs of legs and a pair of false legs of the abdomen.
 
Biology:
Over a four to five month period, females deposit 45-285 shiny white eggs in crack or crevices in the foods they are infesting.  They molt two to four times, and the life cycle (egg to adult) usually requires 30-50 days, although it may take as long as 375 days. There can be six to seven generations per year.  Adults usually live 6-10 months but have been known to live for up to three years.

Habits:
Saw-toothed grain beetles feed on a wide variety of stored products including flour, bread, breakfast cereals, macaroni, dried fruits, nuts, dried meats, sugar, dog food and biscuits. Since these beetles are very flat, they easily hide in cracks and crevices and often penetrate poorly sealed packaged foods.

The larvae feed on the same materials as the adults.  These insects can develop very large populations in seldom-used stored materials, such as flour.  The homeowner typically becomes aware of the infestation when the adults are seen crawling actively about the pantry area.  The adults are not known to fly and are not attracted to light.