You can certainly lose your appetite fast when you find little worms or tiny bugs in the flour. The incidence of “cereal or pantry pests” has greatly increased in the last five years. This fact sheet will help you control and prevent these scavengers from infesting your food and your home.
Pantry pests may fly into your house from the outside or more likely they are brought in on grain based products, pet food, and bird seed purchased at grocery, natural food, or feed stores.
All of the pantry pests have four life stages: egg, larva, pupa, and adult. They prefer warm and humid conditions. They cannot live very long at very low temperatures or very high temperatures. The larva and adult stages may be noticeable in food products.
These pests infest flour, dry pet food, peas, dried vegetables, grain, milled cereal, bran, nuts, macaroni, spaghetti, spices, dried flowers, etc.
There are four groups of common pantry pests. They are classified as follows:
External Feeders: Feed from the outside of the grain
Pest | Usually Feeds On |
Drugstore Beetle, Cigarette Beetle | Cereals, dry dog food, spices, powdered milk, rice, seeds, grain |
Indian Meal Moth (larva & adult) | Stored grains, milled cereals, corn meal, dried fruits, bird seed, nuts, dried flowers |
Internal Feeders: Larva feed entirely within the kernel of the whole grain
Pest | Usually Feeds On |
Rice Weevil Granary Weevil Pea/Bean Weevil Angoumois Grain Moth |
Whole kernels of oats, wheat, rice, barley, ans peas, beans, and bird seed |
Scavengers: Feed only on grain after the seed coat has been broken either by milling or by some other insect.
Pest | Usually Feeds On |
Sawtoothed Grain Beetle Red Flour Beetle Confused Flour Beetle |
Cereals, cornmeal, flour, macaroni, oats, dry pet food, “shake and bake” coating mixes, spices, etc. |
Mediterranean Flour Moth | Flour, nuts, chocolate, beans, dried fruit |
Secondary Feeders: Feed on material that are damp and have mold growth present
Pest | Usually Feeds On |
Mealworms | Damp and moldy boxes of cake mixes, animal feed, cereals, etc. |
Locate the source of infestation. Look for boxes or bags of grain, pasta, coating mix, flour, spices, bird seed, dry pet food, etc. If any of the products appear infested, dispose of the product and the container into a plastic garbage bag and remove it from your house. If you wish to salvage the product you may do the following:
Clean and remove food particles. Thoroughly vacuum the cupboards to remove loose food, insects, larva, cucoons, webbing, etc.
Check all of these areas:
Food storage shelves Under cans and boxes Unwashed flour sifter Under refrigerator and stove Between corners of shelves Between stove and wall Bags of pet food or bird seed Under sink Dried flower displays Corner or edge of wall and ceiling Behind pictures or clocks on the wall On or around spice racks
The adult moths may persist for a week or two after the treatment. This results when larva have crawled into inaccessible areas and begin to hatch out. If the appearance of the adult moths persist beyond two weeks, there may be some other undiscovered source of infestation. Continue the search. Pheromone traps may help identify the source of the problem and will continue to capture the adult moths.
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