Insect growth regulators: laboratory and field evaluations of Thompson-Hayward TH-6040 against the house fly and the stable fly.

In the laboratory, the insect growth regulator, Thompson-Hayward TH-6040, ( N -(4-chlorophenyl)-N′-(2,6-difluorobenzoyl)-urea), prevented the emergence of the house fly, Musca domestica L., and the stable fly, Stomoxys calcitrans (L.), when it was applied topically at a rate of 1 mg/ft2 of surface breeding area. In a cattle feedlot and at a waste water treatment plant, TH-6040 applied to the surface of the breeding area at a rate of 50 mg/ft2 gave 90% control of house flies. The TH-6040 apparently is effective only by ingestion. The IGR caused a disruption in the cuticle formation of the house fly and the stable fly during larval-pupal metamorphosis.