Abstract

White grub (Holotrichia consanguinea Blanch.) has been reported to be a serious impediment for getting optimum yield of groundnut. The performance of nine insecticides as seed dresser and eight insecticides and a combination of two insecticides in the standing crop were evaluated in groundnut against white grub during kharif 2013 and 2014. The pooled analysis of seed treatment revealed the minimum cumulative plant mortality (4.98%) due to white grub, maximum protection over control (88.61%) and maximum pod yield (26.98 q/ha) in clothianidin 50 WDG at 3 g/kg seed. It was followed by imidacloprid 17.8 SL at 4 ml/kg seed (5.87%, 86.57% and 26.45 q/ha, respectively). Both the treatments were at par with each other and found significantly superior to other treatments. The lower doses of clothianidin 50 WDG and imidacloprid 17.8 SL at 2 g/kg and 3 ml/kg seed, respectively, showed significantly lesser plant mortality, higher protection over control and pod yield in comparison to other treatments and control. The pooled analysis of standing crop trials showed the minimum cumulative plant mortality (9.20%) due to white grub, maximum protection over control (79.50%) and maximum pod yield (25.92 q/ha) in quinalphos 25 EC at 2500 ml+imidacloprid 17.8 SL at 350 ml/ha. This consortium was found to be significantly superior to all the other treatments. The next best performance was given by imidacloprid 17.8 SL at 500 ml/ha (plant mortality 11.40% and pod yield 24.68 q/ha), imidacloprid 17.8 SL at 350 ml/ha (plant mortality 12.35% and pod yield 24.17 q/ha) and clothianidin 50 WDG at 300 g/ha (plant mortality 12.98% and pod yield 22.55 q/ha).