Bio-efficacy of newer insecticides against head borer, Helicoverpa armigera (Hubner) infesting sunflower.

摘要

A field experiment was conducted during spring 2008 to evaluate the efficacy of some new insecticides in the management of head borer, Helicoverpa armigera (Hubner) on sunflower crop. The results revealed that maximum larval mortality (84.81%) and maximum yield (3294 kg/ha) were obtained with the treatment spinosad, which was at par with endosulfan (82.28% and 3255 kg/ha, respectively) and followed by quinalphos (72.93% and 3147 kg/ha, respectively). Bacillus thuringiensis (Bt.) brand Kurstaki and cypermethrin failed to give an appreciable control. Endosulfan treatment provided maximum (1:21.3) cost:benefit ratio followed by quinalphos (1:15.8).