Grain Weaver Moth (or Flour Moth)
Scientific Name: Ephestia kuehniella / Pyralis farinalis
Order & Family: Order: Lepidoptera, Family: Pyralidae
Size: 5 mm to 10 mm in length with a 15 mm to 25 mm wingspan
Natural Habitat
Pantries, warehouses, kitchens, and areas where grain or flour products are stored
Diet & Feeding
Larvae feed on flour, cereal, dry grains, nuts, and processed plant foods
Behavior Patterns
Night-active adults; larvae spin silk webs through their food source as they feed, creating clusters
Risks & Benefits
Pest that contaminates food supplies with silk and frass; no direct physical risk to humans but causes significant food waste
Identified on: 12/27/2025