Abstract
The male pupae at the vairous stages were treated for 24, 48 and 72 hours with high temperature (38°C). The mortality of pupae was low in the experimental groups to which high temperature was appiled for 24 hours. Most of the male adults which emerged from the pupae treated for 24 hours mated normally with the untreated females and the percentage of unfertilized eggs was generally low, except for those treated at 144 hours after pupation, in which the percentage was 94.2. When the pupae were treated for 48 hours, the marked effect was revealed in the group treated at 144 hours after pupation. The mortality of pupae was 39.6 and 75.9 percent of the emerged male adults was non-mating. When the adult males treated in the pupal period mated with normal females, unfertilized eggs was obtained in the groups treated at 48 hours and at 144 hours, 93.9 and 92.0, repectively. In the pupae treated for 72 hours the remarkable effect was seen in every experimental group. It became evident that the pupae in the period from 48 to 96 hours and from 144 to 192 hours after pupation were quite sensitive to high temperature, especially in the latter.
