Reproductive Inhibition Activity of the Insect Growth Regulator TH 6040 Against the Stable Fly and the House Fly: Effects on Hatchability13

Abstract

The insect growth regulator, Thompson-Hayward TH 6040 (N-(4-chlorophenyl)-N′-(2,6-difluorobenzoyl) urea), reduced the hatch of eggs of the stable fly, Stomoxys calcitrans (L.), and the house fly, Musca domestica L., with no effect on fecundity. The chemical was active primarily on the females, but treated males also transferred the effect to untreated females. The effect could be defined as ovicidal or laricidal as fully developed larvae failed to emerge from eggs. At the doses used, the effect was inrreversible. The stable fly was more susceptible than the house fly.