Abstract
The physiology of the overwintering adult stage of Sitona cylindricollis (Fahr.), the sweetclover weevil, has been examined. It has been shown that the dormancy is characterized by a drop in oxygen consumption, a cessation of development in the reproductive organs, and a slight rise in fat content; and that the termination of dormancy is characterized by a reversal of these conditions. The water content does not change. Although the total respiration exhibited the characteristic U-shaped curve from entry into dormancy until its cessation, the CO-insensitive respiration remained at a low level throughout. Termination of the dormancy requires a period of exposure to low temperatures. It is concluded that this dormancy is not essentially different from diapause in immature insects.
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