Efficacy of botanicals and trichoderma viride against alternaria leaf blight (Alternaria brassicicola) of mustard (Brassica juncea L.)

The incidence and severity of Alternaria blight in rapeseed-mustard fields is greatly influenced by temperature, relative humidity, soil condition at the time of planting, splashing rain, wind velocity, leaf wetness and inoculum density available in the soil (Meena et al., 2004).