Toxicity of insecticide aerosol drops to tsetse flies. I. some effects of temperature, formulation and drop size

Abstract

Abstract A technique for applying mature drops of insecticide aerosols, the Mature Aerosol Placement (MAP) technique, has been used in laboratory bioassays with tsetse flies (Glossina morsitans morsitans Westw.) to study a number of variables which could affect the efficacy of aerial applications in the field. Deltamethrin was more toxic to tsetse flies than endosulfan and this superiority was greater at a lower temperature, with factors of x 26 at 25°C and x 64 at 10°C. Toxicities of endosulfan‐deltamethrin and endosulfan‐alphacypermethrin mixtures were not affected by the different temperatures. The endosulfan‐deltamethrin mixture was superior to the endosulfan‐alphacypermethrin mixture by factors of x 1.4 at 10°C and x 2.0 at 25°C. The conventional EC formulation of endosulfan was less effective than the special T formulation, but the presence of emulsifiers in the T formulation did not affect its toxicity. No clear differences in LD50s (expressed as active ingredient) could be demonstrated between 15μ...