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Powdery mildew caused by Phyllactinia corylea (Pers.) Karst is a serious disease of mulberry inflicting considerable qualitative as well as quantitative losses. Owing to non eco-friendly nature, toxicity to silkworm, high cost and other side effects of chemical control measures, search for other management strategies devoid of such drawbacks becomes inevitable. In the present study, five biocontrol agents viz., Trichoderma viride, Trichoderma harzianum, Gliocladium roseum, Trichothecium roseum and Chaetomium indicum were evaluated for their efficacy against powdery mildew of mulberry. Culture filtrate of these biocontrol agents were tested in vitro for their fungitoxicant activity against conidial germination of P. corylea. Among the culture filtrate of biocontrol agents tested, both T. viride and T. harzianum @ 50.0% were highly effective and inhibited the conidial germination by 75.08% and 72.23%, respectively. Gliocladium roseum, T. roseum and C. indicum each at 6.25% concentration were the least effective treatments and did not provide more than 11.0% conidial germination inhibition. The in vitro treatments exhibiting conidial germination inhibition of more than 50.0% were also tested in vivo for the management of the disease. Culture filtrates of T. viride and T. harzianum both at 50.0% concentration were equally most effective and were at par with carbendazim 50 wp @ 0.05% by providing 65.14% — 68.68% disease control.
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