Author(s):

Kiran Goswami, AK Tewari and Pooja Upadhyay

Abstract: Sclerotinia rot of rapeseed-mustard caused by Sclerotinia sclerotiorum (Lib) de Bary has become a serious problem in India since last few successive years. Among eleven fungicides tested in vitro, Thiophenate methyl and carbendazim + mancozeb (SAAF) proved to be the best as they completely inhibited the mycelial growth of the pathogen at 250 µg a.i./ml. The fungicides viz., iprodione, hexaconazole, triademefon, tebuconazole, carbendazim, benomyl, propiconazole and mancozeb were also effective in inhibiting mycelial growth (92.6 to 97.7%) at 250 µg a.i./ml. The metalaxyl+ mancozeb (ridomil 72 MZ) was found least effective in checking the growth of the pathogen. Benomyl and carbendazim were found most effective in inhibiting sclerotial germination, while others were ineffective. Complete inhibition of sclerotial germination was observed when sclerotia were dipped in benomyl at 100 µg a.i./ml either 5 or 15 minutes, while carbendazim showed complete inhibition at 250 µg a.i./ml. only in 15 minutes dip treatment.

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