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Efficiency of fungitoxicants on the control of root rot of cowpea caused by mixed inocula of rhizoctonia solani rhizoctonia bataticola and fusarium solani



Efficiency of fungitoxicants on the control of root rot of cowpea caused by mixed inocula of rhizoctonia solani rhizoctonia bataticola and fusarium solani



Indian Journal of Mycology & Plant Pathology 14(1): 57-68



Chemical control of root rot of cowpea caused by Rhizoctonia solani, R. bataticola and Fusarium solani was studied under artificially infested soil. The 3 pathogens were added to soil at 4 different inoculum ratios so that varied levels of mixed infections were developed in cowpea seedlings. The fungitoxicants were used both as seed treatment and soil drench. Seed treatment with carbendazim and soil drenching with carbendazim and thiophanate-M gave good disease control even at higher inoculum levels. The involvement of 3 pathogens in causing seedling mortality was greatly dependent on inoculum ratio and the fungitoxicant used. Influence of various soil factors viz. soil moisture, temperature, texture, pH, etc. on disease control efficacy of fungitoxicants was investigated. Thiophanate-M treatment gave best disease control at 4 different moisture levels tested. Whereas at 40% ASM there was a greater reduction of disease control potentiality of most of the fungitoxicants. Disease control was satisfactory at low temperature (25-30.degree. C), whereas more than 40% reduction in control was noted in all the 3 fungitoxicants tested at higher temperature (35-40.degree. C). The fungicidal activity of chemicals was greatly reduced in clay soil. Best control was observed when seeds treated with thiophanate-M was sown in sandy soil. At soil pH 7.0, the involvement of 3 pathogens in seedling rot was maximum. Quintozene and MEMC treatments gave maximum disease control at soil pH 7.0 and 8.0, respectively. The 2 organic matter, viz. FYM [farmyard manure] and BGS [Bio-Gas Sludge] reduced the disease control efficacy of the fungitoxicants. BGS were more active in reducing fungitoxicity than FYM. Disease control was variable when soil was amended with N, P, and K. Cent percent disease control was obtained in K amended soil. Interaction of these factors on disease control efficacy of fungitoxicants in soil having more than 1 pathogens is highlighted.

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Accession: 005336831

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