Evaluation of Combined Application of Newer Insecticides with Some Fungicides to Control Groundnut Stem Rot, Sclerotium rolfsii sacc. under in Vitro

An in-vitro experiment was conducted to determine the effect of different insecticides, fungicides and their combination treatments on radial colony growth of Sclerotium rolfsii Sacc. by following poison food technique in PDA medium. Two contact (chlorpyriphos 0.05%, thiodicarb 0.075%), three stomach and contact poison insecticides (chlorfenapyr 0.002%, spinosad 0.0025 and emamectin benzoate 0.003%), among the fungicides one systemic (hexaconazole 0.2%), one contact (Mancozeb 0.25%) and their ten insecticide-fungicide combinations were evaluated with recommended doses against S. rolfsii in laboratory during the year 2009-2010 at S.V. Agricultural College, Tirupati. Chlorpyriphos 0.05 per cent (70.33%) was the best insecticide to restrict the fungal growth effectively followed by emamectin benzoate (34.03%). The two fungicides i.e. mancozeb 0.25 per cent, hexaconazole 0.2 per cent and their combinations with insecticides were found effective in reducing (cent per cent) the growth of S. rolfsii. Fungicides do not shown any antagonism when mixed with insecticides.