Efficacy of bio-agents and plant extracts against Alternarial leaf blight of mustard (Brassica juncea L.)

Field experiment was conducted at the research plot of the Department of Plant Pathology, SHIATS, Allahabad, U. P. during the rabi season of 2015-16 to test, “Efficacy of bio-agents and plant extracts against alternarial blight of mustard (Brassica juncea L.)” alternaria blight is one of the most common and devastating disease of mustard plant which is caused by the fungus Alternaria brassicicola. The antifungal activity of three plant extract and bioagents. Per cent disease intensity on leaves at 45, 60 and 75 DAS were recorded. Results showed Trichoderma viride @ 2%, was the most effective bio-agents in managing the disease intensity of leaf blight on mustard caused by Alternaria brassicicola. Trichoderma harzianum 2% (fs) significantly reduced Alternaria blight, followed by Neem leaf and Tricoderma viride (fs) 2%, Neem leaf extract(fs) 10%, Dhatura leaf extract(fs)10%, Allium sativam 10%. All the tested botanicals significantly inhibited the fungal growth. The minimum growth was recorded in Alium sativum However Trichoderma harzianum the most effective bio-agents in managing the disease intensity of leaf blight on mustard caused by Alternaria brassicicola.