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1,2.Dept of Plant Pathology, S.V. Agricultural College, Tirupati, 3.Dept of Plant Pathology, IFT, RARS, Tirupati,
4.College of Agril. Engg., Madakasira, Ananthapur
ABSTRACT
A shift towards organic farming suggests the amalgamation of organic resources against soil borne plant pathogens. In the present study, efforts were made to explore the efficacy of organic amendment extracts against Rhizoctonia solani. Efficacy of six oil free cakes viz., neem, karanj, castor, groundnut, sunflower and gingelly at 5, 10 and 15 per cent concentrations were evaluated by using poisoned food technique. All the amendments tested were significantly superior to control in checking the mycelial growth of the fungus. Among the tested amendments groundnut cake showed (100 %) inhibition at 15 per cent concentration followed by neem cake (86.66 %) inhibition. The least inhibition was recorded with castor cake (44.44 %). A mong the six organic amendments tested against sclerotial viability only two viz., neem and groundnut cakes were found to be effective in inhibiting the sclerotial germination at higher incubation periods of 24 hrs. Rest of the amendments tested were ineffective in inhibiting sclerotial germination even though they were effective in inhibiting the mycelial growth. Neem cake and groundnut cake were also effective in inhibiting sclerotial germination when applied to soil.
KEY WORDS: Amendment, inhibition, Rhizoctonia solani, sclerotia