Sitophilus zeamais

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Sitophilus zeamais (click on image to enlarge it)
Author: Gary Alpert
Source: IPM Images

Sitophilus zeamais (Motschulsky, 1855) - (maize weevil)

This species is common in tropical and subtropical countries around the world where it attacks stored as well as ripe standing cereals in the field, particularly maize. In temperate regions, it is found in grain storage only. Losses in stores often reach 30% (sometimes up to 80%) if these are not protected. Cassava products and stored fruits may also become infested. The larvae develop inside the whole grains and the development from egg to adult lasts about 4-6 weeks. Control is done by fumigation or controlled atmosphere (low oxygen and high carbon dioxide).

Vernacular names
• Deutsch: La-Plata Maiskäfer
• English: maize weevil
corn weevil
• Español: gorgojo del maíz
• Français: charançon du maïs
calandre du maïs

The adult is 3 - 3.5 mm long, dark brown to black and often with 4 reddish spots on the elytra. It closely resembles Sitophilus oryzae, but is usually slightly larger and has several distinguishing characters, like the punctures on the pronotum being round rather than oval in shape.

Calandra oryzae var. platensis
Calandra zeamais

For details see the respective page in Wikipedia.