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Lotus Pest Control
Merchant Grain Beetle
Pantry Pest

Merchant Grain Beetle

Oryzaephilus mercator

The Merchant Grain Beetle is nearly identical to the Sawtoothed Grain Beetle in appearance but differs in food preferences, favoring oily products like nuts, seeds, chocolate, and dried fruit over plain cereals.

Identification

Size

2.5-3 mm

Color

Flat, dark brown - nearly identical to sawtoothed grain beetle

Key Trait

Nearly identical to sawtoothed grain beetle but prefers oilier products like nuts, chocolate, and dried fruit.

Behavior & Habitat

Same flat-bodied pantry pest behavior as sawtoothed grain beetle. Prefers higher-fat food products. Can fly in warm conditions.

Habitat: Same as sawtoothed grain beetle but concentrated around nuts, chocolate, and oily products.

Diet: Nuts, seeds, chocolate, dried fruit, cereals, and oily processed foods.

Signs of Infestation

  • Same as sawtoothed grain beetle, concentrated in oily food products

Risks & Damage

food

Contaminates stored food products, particularly nuts and chocolate.

Prevention Tips

  • 1.Same as sawtoothed grain beetle - sealed containers, shelf cleaning

Why DIY Treatment Often Falls Short

Same challenges as sawtoothed grain beetle.

Professional Treatment

Same as sawtoothed grain beetle.

Frequently Asked Questions

How is it different from the sawtoothed grain beetle?
Nearly identical in appearance. The merchant grain beetle prefers oilier foods and can fly in warm conditions, while the sawtoothed grain beetle prefers starchy products and does not fly.
Does it matter which one I have?
For homeowners, the control methods are identical. The distinction helps professionals understand which food products to prioritize during inspection.
Can it fly?
Yes, unlike the sawtoothed grain beetle. This means it can spread between food sources more readily.

Need Help With Merchant grain beetle?

If you're seeing signs of merchant grain beetle in or around your home, professional treatment is the fastest way to stop the problem. Lotus Pest Control offers free inspections to identify the issue and recommend the right solution.

Schedule a Free InspectionCall (417) 238-0550

At a Glance

Category
Pantry Pests
Scientific Name
Oryzaephilus mercator
Size
2.5-3 mm
Color
Flat, dark brown - nearly identical to sawtoothed grain beetle
Key Trait
Nearly identical to sawtoothed grain beetle but prefers oilier products like nuts, chocolate, and dried fruit.
Regions
Southeast, South Central, Northeast, Midwest
Threat Level
Low
Risk Types
food
Seasonal Activity
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
none
low
moderate
high
peak