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; cannot normally overwinter in temperate areas unless grain heats.
Rice Weevil (Sitophilus oryzae). The rice weevil is able to fly, has small round pits on the surface of the thorax, and red to yellow markings on the forewings. It is less tolerant of low temperatures than the granary weevil. It is widely distributed in both temperate and tropical regions where grain crops are grown and also may be found on acorns (Figure 2).
(Slide and top caption courtesy of ICI Americas, Inc.)