Relative Toxicity of Selected Insecticides to Aphis gossypii Glover of Some Districts of Maharashtra

The relative toxicity of selected insecticides to field population of Aphis gossypii Glover of Dhule district were methyl demeton, dimethoate and imidacloprid less toxic by 0.18, 0.19 and 0.47 fold, respectively than acetamiprid at LC₅₀. At LC₉₀these was less toxic by 0.08, 0.10 and 0.49 fold, respectively than acetamiprid in the same sequence. The relative toxicity of selected insecticides to Aphis gossypii Glover of Nandurbar district were methyl demeton, dimethoate and imidacloprid less toxic by 0.23, 0.28 and 0.48 fold, respectively than acetamiprid. At LC₉₀ these were also less toxic by 0.073, 0.071 and 0.27 fold, respectively than acetamiprid but not in same sequence. In Dhule and Nandurbar districts, the insecticides in the ascending order of toxicity was methyl demeton < dimethoate < imidacloprid < acetamiprid at LC₅₀. Similarly toxicity of selected insecticides to Aphis gossypii Glover of Jalgoan district were dimethoate, methyl demeton and imidacloprid less toxic by 0.18, 0.20 and 0.44 fold, respectively than acetamiprid at LC₅₀. At LC₉₀ methyl demeton, dimethoate and imidacloprid were less toxic by 0.07, 0.09 and 0.28 fold, respectively than acetamiprid. In Jalgoan districts, the insecticides in the ascending order of toxicity were dimethoate < methyl demeton < imidacloprid < acetamiprid at LC₅₀.