Evaluation of pre sown application of granular insecticides against white grub (Holotrichia longipennis) infesting soybean grown under rain-fedcondition of Uttarakhand hill

摘要

Field experiment was conducted at Research Station, Gaja, College of Forestry and Hill Agriculture, G. B. Pant University of Agriculture & Technology, Ranichauri to evaluate the various pre sown application of granular insecticides i.e. chlorpyriphos 10G(@2.0 kg a. i. ha1), phorate 10G (@ 2.5 kg a.i. ha1), carbofuran 3G (@0.75 kg a.i. ha1), clothianidin 50 WDG (@ 0.12 kg a.i. ha1), fipronil 0.3 G, (0.60 kg a.i. ha1), thiamethoxam 25 WG (0.08 kg a.i. ha1) and imidacloprid 70WG, (0.30 kg a.i. ha1) against white grub infesting soybean grown under rain-fed condition of Uttarakhand hill. Result indicated that all the insecticidal treatments were found significantly superior with cumulative plant mortality of 8.20 -15.18% as compared to untreated control where highest plant mortality was 28.67 percent. Clothianidin 50 WDG applied 0.120 kg a.i. ha 1 proved to be most effective by registering lowest plant mortality (i.e. 6.94 and 8.20%) followed by imidacloprid 70WG @ 0.30 kg a.i ha 1 where the plant mortality was 8.99 and 8.5 % during two consecutive years.