Synergized Pyrethrins And Allethrin Baits for the Control of Resistant House Flies

Pyrethrins and allethrin synergized by piperonyl butoxide at a ratio of 1: 10 and incorporated in sugar baits were effective against. organophosphorus-resistant house flies (Musca domestica L.) in laboratory tests and field tests in dairy barns of central Florida. In laboratory tests both were less effective than Dipterex against susceptible flies, but pyrethrins were about equal against a malathion-resistant strain. In field tests pyrethrins at 0.1% were superior to allethrin at 0.1%, which in turn was more effective than Dipterex at 1% in the reductions obtained 10 minutes after treatment. In the 24-hour reductions pyrethrins were again superior to the allethrin, which was equal to Dipterex.