Compatibility study of fungal and bacterial bio control agents with agro chemicals

Abstract

Fungicides/combination of fungicides, insecticides and herbicides were tested for their compatibility with Trichoderma harzianum and Pseudomonas fluorescens under in vitro. Carbendazim @ 50, 100, 250 and 500 ppm, and copper oxychloride @ 1000, 1500, 2000 and 2500 ppm concentrations, completely inhibited growth of T. harzianum. Methyl-o-demeton at all the four concentrations i.e. @ 250, 500, 1000 and 1500 ppm were found incompatible with 94.44% growth inhibition. However, chlorpyrifos and cartap hydrochloride @ 250 and 500 ppm were moderately compatible. Quizalofop-ethyl at 500, 100, 1500 and 2000 ppm produced incompatible reaction with 94.44% growth inhibition of fungal bioagent T. harzianum. At initial two lowest concentrations, pendimethalin @ 500 and 1000 ppm and fenoxyprop-p-ethyl @ 50 and 100 ppm found compatible with T. harzianum. All the fungicides/combination of fungicides, insecticides and herbicides tested at all their concentrations were completely compatible with Pseudomonas fluorescens isolate-1.