Foliar Application of Chitosan and Yeast Elicitor Facilitate Reducing Incidence and Severity of Alternaria Leaf Blight of Tomato and Brinjal

Two pot experiments were conducted in the net house to investigate whether aqueous solution of chitosan and yeast elicitor can suppress Alternaria leaf blight of tomato and brinjal. Aqueous solutions of chitosan and yeast elicitor were applied on seeds and on the foliage of tomato and brinjal at three growth stages following 0.02, 0.05, 0.1 and 0.2% concentration respectively. The chitosan and yeast elicitor-treated plants were further inoculated artificially to create sufficient disease pressure to monitor incidence and severity. Differential responses were recorded for chitosan and yeast elicitor considering both growth stages and type of crops. Chitosan performed superior in tomato plants while yeast elicitor in brinjal plants considering both disease incidence and severity. In both cases, 42 DAT was more suitable for chitosan and yeast elicitor spray to get maximum disease suppression. Chitosan and yeast elicitor at 0.2% showed superior performance in reducing blight incidence and severity by Alternaria.

Author(s): F.H. Tumpa, M.A.R. Khokon

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