Skip to main content

Verify Location

Please verify the zip code of the address where you would like Cook's service.

Saw-toothed Grain Beetles

Identification, Habits, and Control
Closeup photo of a Saw-toothed Grain Beetle

About Saw-toothed Grain Beetles

Species: Oryzaephilus surinamensis

Saw-toothed grain beetles are common pantry pests that infest stored food products, particularly grains, cereals, flour, and other dry goods. They are frequently found in homes, grocery stores, and food storage facilities. Because they can spread quickly through stored products, infestations can become widespread if not addressed early.

How to Identify Saw-toothed Grain Beetles

Size

  • Approximately 1/10 inch long
  • Very small and narrow

Color

  • Brown
  • Uniform in color

Identifying Characteristics

  • Flat, elongated body
  • Distinct saw-like projections along the sides of the thorax
  • Active and fast-moving within food products
  • Often found in large numbers

Where You’ll Find Them

  • Stored grains, cereals, and flour
  • Pantries and kitchen cabinets
  • Packaged foods, including unopened items
  • Commercial food storage and processing areas

Behavior and Risks

Saw-toothed grain beetles infest stored food products by feeding on processed grains and dry goods. Unlike some pantry pests, they cannot bore into whole kernels, but they thrive in packaged and broken food products.

Homeowners may notice them crawling inside food containers, along pantry shelves, or in packaged goods. Infested products may contain live beetles, larvae, or fine debris from feeding activity.

Because they are highly active and able to spread quickly between packages, infestations can expand rapidly throughout a pantry or storage area. In commercial environments, this can impact large quantities of stored goods. Control typically involves discarding infested products, cleaning storage areas thoroughly, and ensuring food is stored in sealed, pest-resistant containers to prevent reinfestation.