Effectiveness of different spray schedules against mango hopper and yield of mango cv. Himsagar

Field experiment was conducted at Horticultural Research Farm, Mondouri, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal during 2007-08 and 2008-09 to evaluate the effectiveness of different spray treatments viz., T-1: Spraying of imidacloprid (0.005%) at panicle emergence, T-2: T-1+Spraying of endosulfan (0.07%) at 21 days after spraying of imidacloprid (0.005%) spray and T-3: T-2+Spraying of endosulfan (0.07%) at 15 days after first spraying of endosulfan (0.07%) along with untreated check against mango hopper. All insecticidal treatments were found to be significantly superior in reducing the hopper population as well as increase in fruit yield over untreated check. Among these treatments, the triple spray (T-3) was found to be most effective, which recorded lowest hopper population (5.48 hoppers/panicle) as well as highest fruit yield both at marble stage (197.62 fruits/ 100 panicles) and mature stage (96.4 kg/plant) and avoidable fruit loss (82.9%) followed by T-2 (double spray) and T-1 (single spray), respectively.