Bean Weevils

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Bean Weevil Facts

  • Bean weevils range in size from 3.5 to 5 mm.
  • Bean weevils cause extensive damage to live bean plants, dry stored beans and other grains.

Bean Weevil Infestation

Because bean weevils live inside whole beans and due to their small sizes, only about 1/8 of an inch or 5 millimeters, bean weevil infestations may be difficult to detect in homes, until you find the young adults flying around your home, gathered by the hundreds on windowsills or crawling on your walls.

Female bean weevils deposit over 100 eggs in lifetime A likely place to determine the source and growth potential for a bean weevil infestation lies in stored WHOLE beans in your pantry. Some bean weevils not only infest stored and live beans, but also popcorn kernels, garden seeds, dried seed, decorative items, Indian corn, and “bean bags.” If someone has a true ‘bean bag’ anymore, most are synthetic materials. Female beetles deposit up to 100 individually fertilized eggs on stored beans, by gluing the eggs to the surfaces of beans.

Bean weevil young eat their way into whole beans and feed on bean contents When bean weevil eggs hatch, the white, wrinkled grub-like larval bean weevils eat their way into the beans where they hatch. As the larvae mature and pupate into adults, they emerge through exit holes they make in the beans they infest, to later return to their feeding areas. Bean weevil infested beans develop a whitish hue due to the presence of bean weevil waste that replaces the contents of the bean inside bean shells.

Contact a trusted pest professional, such as Truly Nolen, to schedule a free pest inspection to identify household pests and address your particular situation in devising an elimination plan for household pests.

Additional Information

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