A Comparison of the Amounts of Metepa Required to Sterilize the Screw-Worm Fly and the Stable Fly

Abstract

Tests were conducted to determine the differences in the amounts of metepa required to produce the same effect on fertility of the screw-worm fly, Cochliomyia hominivorax (Coquerel), and the stable fly, Stomoxys calcitrans (L.). With topical treatments, the male screw-worm fly required 5.5 times as much metepa per gram of body weight as the male stable fly, and the female screw-worm fly required 18 times as much as the female stable fly. The values for feeding treatments of the screw-worm fly and stable fly were 3.9 and 6.2 times, respectively, for male and female.