Management of root grub, Holotrichia reynaudi with different insecticides as seed treatment and soil application in groundnut

Abstract

Field experiments on evaluation of different insecticides as seed treatment and soil application against root grub in groundnut was conducted in the microplots specially designed for the management of root grubs at Agricultural Research Station, Utukur, Kadapa during kharif, 2014 and 2015. Holotrichia reynaudi was the test insect, as it was the predominant species in groundnut of Rayalaseema region, Andhra Pradesh. The results revealed that all the insecticides were statistically superior over untreated check (36.31% cumulative plant mortality and 65 kg ha-1 pod yield). Imidacloprid 600 FS @ 2 ml + 2 ml water per kg seed was found to be best treatment with lowest cumulative per cent plant mortality per plot of 3.26%, highest per cent protection over control 91.03%, with highest cost-benefit ratio of 1:1.61 and highest pod yield of 1613 kg ha-1.