Author(s):

Amrita Kumari, PK Jha and Rahul Kumar

Abstract: The leaf spot of Piper longum L. caused by Botryodiplodia theobromae Pat. was found to appear as few tiny spots on lower leaves, which increased in number and size gradually and also, affected upper leaves, finally various spot merged covering the entire leaf and ultimately leaf turned yellow and dried. There was fast development of disease from May to September and maximum disease severity was recorded in the month of September (31.1per cent) Among various fungicides tested against Botryodiplodia theobromae the most effective was Carbendazim at various concentration 0.1%, 0.2% and 0.3%; among other fungicides Propiconazole, Blitox -50 and SAAF were also effective. Among various botanicals extract, Brahmi extract was most effective in suppression of growth of target pathogen, the next most effective extract was mundookprani, which also markedly supressed the growth of pathogen. All the native and commercial isolates of Trichoderma viride and Trichoderma harzianum were found highly effective in supression of growth of pathogen. However native isolates of Trichoderma viride and Trichoderma harzianum showed significantly stronger antagonistic effect against the pathogen as compared to commercial isolates of the both antagonists (Trichoderma viride and Trichoderma harzianum). Among all the isolates, Trichoderma viride native showed the strongest antagonistic effect. The most effective chemical and botanical and the strongest native antagonists -Trichoderma viride may be utilised for evolving integrated disease management strategy against leaf spots of Piper longum caused by Botryodiplodia theobromae

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