Eight common insect pests - Rice weevil

Rice weevil

This weevil has been found in southwestern Ontario storage facilities and in some prairie elevators in recent years. A severe infestation can reduce stored grain to a mass of hulls and frass, that is, larval excrement.

Appearance and behaviour

The adult:

  • Is 0.2 to 0.4 centimetres long
  • Has four distinct reddish orange spots on the wing covers which are folded over the abdomen

Adult rice weevils can fly.


Complete development from egg to adult takes 28 days when the temperature of the grain is 30°C and the moisture content is 14 percent. At optimal temperatures, the life cycle may take four weeks.

Rice weevil image

Dorsal view of the Rice weevil More on the Rice weevil
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