STORED GRAIN INSECTS

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Wayne Bailey
State Extension Entomologist
University of Missouri - Columbia

A. FARM STORED GRAIN


Principal Stored Grain Insects

DESCRIPTION
  1. Granary weevils cannot fly. Eggs are placed inside whole kernels. Damage is caused by the larvae feeding in whole grain and the adults feeding in and on whole or broken grain.
  2. Saw-toothed grain beetles seldom fly but both the larvae and adults feed on cracked or broken grain, flour, meal, breakfast food, stock feed, candy, and dried fruit. The thorax, the body region behind the head, has saw- toothed points on both sides.
  3. Larvae and adults of the red flour beetle and a closely related species, the confused flour beetle, feed on flour, grain dust, and broken grains.
  4. Larger cabinet beetles and several closely related species are general feeders on grain and grain products. They will also feed on material of animal origin, such as hides.
  5. The eggs of the lesser grain borer are placed on kernels and the larvae bore into the kernels. The adults can fly and also feed on grain.
  6. Rice weevil adults can fly. Eggs are laid inside the kernel. The larvae feed in whole grain while the adults will feed both in and on grain.
  7. Indian-meal moth larvae spin webs on the surface of grain and feed on kernels enclosed within the webbing. The larvae will also spin webs on sacked grain in storage areas.
  8. Cadelle larvae and adults feed on whole grain. The larvae bore holes in the wood within bins where they hibernate. This is one of the largest stored grain insects.
  9. Flat grain beetles are one of the smallest common stored grain insects. It Is usually found associated with out-of-condition or insect damaged grain.
  10. Angoumois grain moth eggs are laid on the outside of the grain. The larvae bore into the grain and feed within the kernel. Adults may fly from granaries and infest corn in the field.
CONTROLLING STORED GRAIN INSECTS

For control recommendations in farm bins see UMC Guide 7100, "Insects in Farm Stored Grain-Their Prevention and Control." For control in kitchens see UMC Guides 7374, "Angoumois Grain Moth and Indian Meal Moth;" and 7376, "Saw-toothed Grain Beetle, Confused Flour Beetle, and Red Flour Beetle." These are available at your county University Extension Center.