The influence of certain physical stresses on pulal mortality of Culex pipiens complex L. II. Effect of exposure to oxygen and partial vacuum.

Abstract

The results indicated that when pupae were exposed to oxygen atmosphere for different periods ranging from V2 - 48 hours, the pupal mortality increased with increasing the exposure periods. The mortality reached to about 50% after 24 hours and more than 60% after 48 hours. When the pupae were exposed to partial vacuum (0.01-0.1 torr) for different exposure times (V2 - 48 hours) the percentage mortality increased gradually with increasing the degree of evacuation and with increasing the exposure periods.