Merchant Grain Beetle / Sawtoothed Grain Beetle

Natural Habitat

Pantries, kitchen cupboards, and commercial food storage areas; often found in grains, cereals, and dried fruits.

Diet & Feeding

Processed grain products like oats, rice, flour, cereal, nuts, seeds, and dried pet food; they do not eat whole, undamaged kernels.

Behavior Patterns

They have flattened bodies allowing them to crawl into tight crevices of food packaging. They are active crawlers and very prolific, completing a life cycle in 27 to 50 days.

Risks & Benefits

They do not bite, sting, or damage structures, but they are major household pests that contaminate stored food with larvae, fecal matter, and shed skins, leading to food waste.

Identified on: 3/13/2026