Compatibility of phorate and chlorpyriphos with Trichoderma harzianum for integrated disease management in black pepper

Abstract

In the integrated management of diseases and pests in black pepper(piper nigrum L.), chemicals such as phorate and chlorpyriphos are recommended besides biocontrol agent, Trichoderma harzianum. In order to understand the compatibility of T.harzianum with phorate and chlorpyriphos, experiments were conducted at different concentrations for each chemical considering the recommended dose(for phorate, 6-36 ppm a.i and for chlorpyriphos, 10-40 ppm). In in vitro studies with phorate , there was no significant difference in growth and spore production. In soil also, there was no reduction in viable colonies. Whereas with chlorpyriphos there was reduction in growth and spore production In in vitro studies, but in soil, there was no such inhibition, on the contrary there was increase in viable colonies. This indicates that phorate and chlorpyriphos can be safely applied with T.harzianum.