International Journal of Plant Protection

T. V. Sangeetha ¹, Shamarao Jahagirdar ²

Affiliations
1 All India Coordinated Research Project on Soybean, Main Agricultural Research station, University of Agricultural Sciences, Dharwad Karnataka, IN
2 All India Coordinated Research Project on Soybean, Main Agricultural Research station, University of Agricultural Sciences, Dharwad Karnataka

Abstract

The ischolar_main trot/ wilt complex of soybean has become a major production constraint in Karnataka. The associated pathogens causing the ischolar_main rot/ wilt are identified as Sclerotium rolfsii, Rhizoctonia bataicola and Fusarium sp. in northern Karnataka, either in combination of two or more than two pathogens. In vitro screening of fungicides, bioagents and botanicals was taken up to identify an effective molecule against all the three pathogens. In vitro studies revealed that Mancozeb, Carbendazim, Thiophanate methyl, Hexaconazole, Propiconazole, Carbendazim + Mancozeb and Carboxin + Mancozeb were more effective in inhibiting the mycelial growth of all the three pathogens.

Keywords

In Vitro Screening, Root Rot/wilt, Chemicals, Bioagents, Botanicals, Soybean

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T. V. Sangeeta ¹, Shamarao Jahagirdar ²

Affiliations
1 Department of Plant Pathology, AICRP on Soybean, University of Agricultural Sciences,Dharwad Karnataka, IN
2 Department of Plant Pathology, AICRP on Soybean, University of Agricultural Sciences,Dharwad Karnataka

Abstract

Soybean [Glycine max (L.) Merill.] is a protein rich oilseed crop. It is considered as a golden bean, miracle bean and wonder crop of the 20th century because of its characters and usage. In India, losses due to various diseases are estimated as 12 per cent of total production. The ischolar_main trot/ wilt complex has become a major production constraint in Karnataka. Three pathogens are involved in causing ischolar_main rot/wilt namely, Sclerotium rolfsii, Rhizoctonia bataticola and Fusarium sp.The association of these pathogens involving two or three varied from region to region. On the basis of morphological characters, the pathogens were identified as Sclerotium rolfsii. which produces the mustard sized sclerotial bodies, Rhizoctonia bataticola which produced brown to black, right angle branched mycelia with septa and Fusarium sp. which produced three kinds of spores viz., microconidia, macroconodia and chlamydospores. The results of physiological and morphological variations are discussed in this paper.

Keywords

Variability, Root Rot/wilt, Soybean

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