Toxicity of several insecticides against fruit flies Bactrocera dorsalis (Hendel) and Bactrocera carambolae (Drew & Hancock) (Diptera: Tephritidae) in the laboratory

Bactrocera dorsalis and Bactrocera carambolae are major pests of various commodities that could cause significant losses, if not controlled. Insecticide usage is a common control carried out by farmers. The test was conducted to determine the toxicity level of several types of insecticides on the mortality of two different fruit fly species. The fruit fly population used in the study came from the collection owned by Center for Forecasting Plant Pest Organisms (BBPOPT), Karawang. The research method used was an experimental method with a Randomized Block Design. The test was carried out using the dry film method. The concentration ranges used were 0.02-1 ml/L fipronil insecticide, 0.01-0.6 ml/L ethion insecticide, 0.02-0.6 ml/L deltamethrin insecticide, and 0.02-0.8 ml/L lambda-cyhalothrin insecticide. The control treatment used was acetone alone. Each treatment was replicated thrice. Mortality was observed at 1, 3, 24, and 48 hours after treatment. Cumulative mortality at 48 hours after treatment was analyzed using probit to determine the LC₅₀ and LC₉₅ values at 48 hours. The results showed that the insecticide deltamethrin was the most toxic insecticide to B. carambolae with an LC₅₀ value of 0.025 ml/L and an LC₉₅ of 0.646 ml/L. Ethion was the most toxic insecticide for B. dorsalis with LC₅₀ values of 0.046 ml/L and LC₉₅ of 0.746 ml/L. The LC₅₀ values of all insecticide treatments for two different species were below the recommended concentrations.