Relationship of disease intensity with weather and management of web blight of winged bean
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Authors
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MITHILESH KUMAR and S.C. DUBEY*
Keywords:
Winged bean, web blight, weather factors, apparent infection rate, integrated managementAbstract
Web blight (Thanatephorus cucumeris = Rhizoctonia solam) of winged bean (Psophocarpous tetragonolobus) appeared during second week of September in 1999 and 2000 and increased gradually till maturity. Apparent infection rate was maximum during September 10 to 17, 1999 and 2000. Weather parameters were correlated with disease development. Significantly negative contribution of minimum temperature was observed in the prediction of disease development through multiple regression analysis equation and accounted for more than 80% variation in disease. Vitavax, bavistin, blitox-50, contaf, tilt, captaf and SAAF completely inhibited the mycelial growth of the pathogen. Seed treatment with Glioc/adium virens (Trichoderma virens) + vitavax was found most effective in vitro. Under field conditions, integration of seed treatment (G. virens + vitavax) and spraying of tilt gave minimum disease incidence and high pod yield followed by integration of seed treatment and spraying of contaf.
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