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Maize Weevil Beetle

Sitophilus zeamais


  • Adult up to 3/16".
  • They are dull red-brown to nearly black and are usually marked on the back with four light reddish or yellowish spots.


  • The female chews a small hole into a grain kernel, into which one egg is laid. A female can lay 300 to 400 eggs over a period of months.
  • An egg hatches in a few days into a larva, which feeds on the interior of the grain kernel. Pupation follows, with the adult beetle emerging later.
  • The entire life cycle takes from four to seven weeks.


  • The maize weevil has fully developed wings beneath its wing covers and can fly readily.
  • This pest destroys stored crops such as corn, wheat, and rice.

Controlling Insects that attack Food Products