Decreasing susceptibility of Helicoverpa armigera (Hubner) to conventional insecticides on cotton

摘要

Efficacy of two conventional insecticides, endosulfan and quinalphos, was evaluated against Helicoverpa armigera (Lepidoptera : Noctuidae) infesting upland cotton variety H 1098, alongwith some newer insecticides at the farmer's field near Hisar during 2003. The results showed that as compared to 100 per cent mortality of the larvae given by indoxacarb (150 g a. i./ha), endosulfan (780 g. a. i./ha) and quinalphos (560 g a. i./ha) provided 70.37 and 70.83 per cent mortality, respectively, indicating decreased susceptibility of the pest to the conventional insecticides. It was suggested that incorporation of newer insecticides in the integrated pest management strategy could help in achieving effective control of this pest on cotton.