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Original and generic products of 4% (W/W) permethrin emulsion were evaluated for their insecticidal effects on housefly Musca domestica adults, which had been collected at a cattle house on Ishigakijima Island, of the Yaeyama Islands, Okinawa prefecture, Japan. Thirty 3–5-day-old adult female houseflies were put in rectangular parallelepiped containers of which the top cover was stainless mesh. Then 100-, 200-, 400-, and 800-fold diluted emulsions of respective drugs were sprayed in amounts of 25 mL/m2, 50 mL/m2, 100 mL/m2, and 200 mL/m2. When less-diluted drugs were sprayed in larger amounts, the times until 50% flies were knocked down (KT50) were shorter and the knocked down rates were higher, reflecting dose-dependence. Among containers for which the same dosages of active ingredients were sprayed, KT50 were lower with larger amounts of drug solution, which demonstrated that quick-acting efficacy was achieved with larger spray amounts. Insecticidal effects of the two drugs, original and generic, were found to be equivalent from this study
Research papers (publications of university or research institution)
