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Visual Reference Library - Insects
 IN-3.0 Maize Weevil

Sitophilus zeamais


The maize weevil is a small snout beetle about 2-3mm in length. It varies from dull red-brown to nearly black and is usually marked on the back with four light reddish or yellowish spots. It is slightly larger than the rice weevil and has more distinct colored spots on the forewings.


The maize weevil has fully developed wings beneath its wing covers and can fly readily. It is a stronger flier than the rice weevil allowing it to distribute itself more easily. Its endemic in tropical and temperate, where maize is grown.


The thorax is densely pitted with somewhat irregularly shaped punctures, except for a smooth narrow strip extending down the middle of the dorsal (top) side.


An egg hatches in a few days into a soft, white, legless, fleshly larvae, which are approximately 4 mm, in length. They eat the internal contents of the maize while developing, which takes approximately 18 to 23 days. At this point, the larvae become pupae, and they begin the transformation into the adult weevil form. During this process, the pupae do not eat or move.The rate of development is slightly slower for the maize weevil than for the rice weevil. A minimum of thirty days is required for passing through the egg, larval and pupal stages.

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Last updated February 2010