Management of the rice leaffolder, Cnaphalocrocis medinalis (Guenee) by newer insecticides

Nine insecticides viz., clothianidin 50WDG, flubendiamide 20 WDG, flubendiamide 480 SC, γ-cyhalothrin 5CS, indoxacarb 15EC, acetamiprid 0.4% + cypermethrin 2% EC,acetamiprid 0.4% + quinalphos 20% EC, acetamiprid 0.4% + chlorpyriphos 20% EC and monocrotophos 36 WSC (check) were evaluated in the field during wet season, 2004 and 2005 against the rice leaffolder, Cnaphalocrocis medinalis (Guenee) @ 15, 25, 24, 12.5, 30, 60, 510, 510 and 500 g a.i. ha-1, respectively. The results revealed that out of nine insecticides sprayed at 20, 40 and 60 days after transplanting, the per cent leaf damage due to leaffolder incidence recorded the lowest (1.81%) with γ -cyhalothrin registering 70.13% reduction over control followed by the newer insecticides indoxacarb (62.21%) and flubendiamide (60.56%). In other treatments the level of suppression was not satisfactory.