Abstract
The effects of percussion on grain and on insect pests of grain have been examined. It was found that adults and unprotected immature stages of the granary weevil ( Sitophilus granarius (L.)) were killed by a relatively small amount of impact forces. To kill immature stages living within the grains required the use of forces intense enough to cause excessive breakage of the grain. It is suggested that the survival of immature stages within the grain was caused by the physical support provided by the grain, which prevented severe flattening of the insect.

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