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B. RAGHAVENDRA* AND T. SRINIVAS
Department of Plant Pathology, S.V Agricultural College, ANGRAU, Tirupati-517 502
Groundnut is an important oil seed crop and is regarded as ‘king of oil seeds’. Among several biotic stresses of groundnut, stem rot caused by Sclerotium rolfsii causes up to 80 per cent yield loss. Saprophytic nature, broad host range and ability to produce resting structures make this pathogen difficult to control. In this experiment, ten fungicides viz., hexaconazole, azoxystrobin, tebuconazole, pyraclostrobin, carbendazim, carboxin, validamycin, chlorothalonil, mancozeb and copper oxy chloride were tested against the mycelial growth of the pathogen at four concentrations i.e. 500 1000, 1500 and 2000 ppm. Among these, hexaconazole, tebuconazole, azoxystrobin and carboxin showed 100 per cent mycelial inhibition at all the concentrations tested, whereas carbendazim proved to be least effective in inhibiting the mycelial growth of S. rolfsii, followed by copper oxychloride and validamycin.
KEYWORDS:
Groundnut, fungicides, mycelial inhibition, Sclerotium rolfsii