Author(s):

M Lakshmi Naga Nandini, SK Nayab Rasool, CH Ruth and K Gopal

Abstract: The compatibility of bio-control agents Trichoderma viridae and Pseudomonas fluorescens was assessed with commonly used chemical insecticides in turmeric viz., thiamethoxam 25% WG (Cruiser), chloropyrifos 20% EC (Dursban), dimethoate 30% EC (Rogor), malathion 50% EC (Malathion) and phosphamidon 40% SL (Demecron) each at three (0.05%, 0.1% and 0.2%) different concentrations. The compatibility tests revealed that the response of the Trichoderma viridae isolate to different insecticides differed significantly. Cent per cent inhibition was noticed at all three concentrations of phosphamidon (40%) (Demecron). The lowest inhibition on growth of antagonist was noticed with dimethoate (30% EC) (Rogar) at 0.05 per cent concentration (19.75%) followed by thiamethoxam (25%) (Cruiser) at 0.1% recorded lowest inhibition of 21.36 per cent which were statistically on par with each other on the growth of the bio-agent where as in others the reduction in growth was in range of 24.70 to 84.44 per cent over control. The response of isolate Pseudomonas fluorescens to different insecticides at three concentrations varied significantly. The data revealed that the antagonist was found compatible with thiamethoxam (25%) (Cruiser) and phosphamidon (40%) (Demecron) at all the three concentrations with zero per cent inhibition. The other insecticides like chlorpyriphos (20%) (Dursban), dimethoate (30%) (Rogar) and malathion (50%) at all three concentrations showed the inhibition on the growth of antagonist in the range of 7.77 and 24.44 per cent. Moreover, the pesticide tolerance ability broadened the use as these bio-pesticides in conjugation with pesticides can be applied under integrated disease management for the management of soil borne plant pathogens.

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