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|Seed weevils occasionally become pests of stored beans, cowpeas, and peas.
Learn about the different insects and pests that affect gardens, lawns and food crops, and how to deal with them.
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Reference: Ohio State University Extension
Seed weevils occasionally become pests of stored beans, cowpeas, and peas. Damage consists of complete or partial destruction of infested seeds by numerous round holes or destruction of all but the outer shell. Many bean weevils may develop from a single seed and later be discovered on windows and doors. They do not bite or sting humans or pets, spread disease, or feed on or damage the house or furniture.
Adult bean weevils are light olive brown, thickly covered with darker brown, grayish-yellow hairs, but with dark cross bands on the wing covers. They are about 1/8-inch in length with reddish-brown legs and black antennae. The body narrows evenly toward the small head.
The cowpea weevil has wing covers with a large rounded spot at midlength and the tips are black. Pea weevils are blackish and covered with reddish-brown and white hairs. They are about 3/16-inch long, with a whitish abdomen end and black legs.
Life Cycle and Habits
Apply control measures soon after harvest and before storage. Examine seeds carefully at the time of purchase or harvest. Homegrown beans and peas are first infested in the garden or field before harvest and storage. Store only clean, dry seeds with a moisture content of 12 percent or less to reduce damage. All insect life stages can be killed by super-cooling in a deep freeze at 0 degrees F for 4 days, cold storage at 32 degrees F for 58 days, or super-heating in an oven at 145 degrees F for 2 hours or in a microwave oven for 5 minutes. However, seeds saved for planting may have the germination reduced by super-cooling, super-heating, or microwave methods. After treatment, seeds should be stored in containers of glass, heavy plastic, or metal with screw-type, airtight lids. Refrigeration or deep freeze storage is helpful.
Storage of grains for a month or more during the warm summer months may lead to infestations. Purchase in small quantities for early use.
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|Data Source: Ohio State University Extension. Articles and resource may contain pesticide recommendations that are subject to change at any time. These recommendations are provided only as a guide and it is always the pesticide applicator's responsibility, by law, to read and follow all current label directions for the specific pesticide being used.|