Minimum Life Cycle: 28 days.
Distribution: Tropical and temperate areas on cereal grains.
Eggs - Laid in stored cereal grains and in cereals in the field by flying adults (more prolific than granary weevil).
Larvae - Feed in grain.
Adults - Also feed; normally cannot overwinter in temperate areas unless grain heats. Good flyer; larger than rice weevil.
Maize Weevil (Sitophilus zeamais). The maize weevil is slightly larger than the rice weevil and has more distinct colored spots on the forewings. It is a stronger flier than the rice weevil. The habits and life cycle are similar to the rice weevil (Figure 3).
(Slide courtesy of Degesch Americas, Inc., and top caption courtesy of ICI Americas, Inc.)