Fungicidal control of Brinjal leaf spot caused by Alternaria alternata

Abstract

Nine fungicides, viz., mancozeb, zineb, thiram, captafol, captan, folpet, chlorothalonil, copper oxychloride and dithianon were evaluated for the control of leaf spot disease of brinjal. Among the fungicides tested in vitro chlorothalonil, thiram and mancozeb inhibited spore germination completely at 500 ppm. Thiram and copper oxychloride were effective and reduced radial growth of the fungus at 1000 ppm followed by captan and captafol which were statistically at par with each other. In field trials, mancozeb @ 0.2%, sprayed 4 times at 10 day intervals was superior among the fungicides tested. It reduced disease severity by 65.26% over control. The next best fungicides were dithianon, thiram, folpet and zineb where disease severity varied from 63.03 to 63.91 per cent. Significantly increased yield (129.00 to 197.29%) were achieved in the plots sprayed with mancozeb, zineb, dithianon, thiram and chlorothalonil. However, mancozeb was the most economical fungicide by giving a net profit of Rs. 10,853/- per hectare.