Effects of Monensin on Development of the Face Fly and the Horn Fly123

Abstract

Cattle feces containing selected concentrations of monensin (Rumensin®) that ranged from 3.125 to 100 ppm resulted in an LC₅₀ and LC₉₀ of 10.71 and 49.05 ppm, respectively, for the face fly, Musca autumnalis De Geer, and 24.71 and 59.12 ppm, respectively, for the horn fly, Haematobia irritans (L.). A dosage concentration response was seen with puparial weights of both species.