Abstract
Laboratory tests on the sterilizing effect of Metepa and Hempa to house flies were conducted. The chemicals were treated to adult flies by topical application method and by bait method with milk solution. Treatments of Metepa by topical application caused a reduction in the number of eggs produced and of larvae hatched out. Males were more affected than females. ED-50 value, when treated to both sexes, was approximately 7.5μml. When treated female crossed with normal male, ED-50 was approximately 30μml. In the test of bait treatment, the reduction of egg production was more remarkable in the case of crossing of treated females with normal males than in the reverse case. When a small dose of Hempa less than 80μml per fly was topically treated, the egg production was not affected, but most of the eggs could not hatch out in the doses of 20〜80μml. ED-50 of Hempa was estimated to be approximately 25μml per fly. Bait treatment of Hempa with a higher concentration than 0.25% was proved to make the flies completely sterile.
