Evaluation of systemic and non-systemic fungicides against Rhizoctonia solani causing web blight in urdbean

Abstract

Experiments were carried out to find out most efficient systemic and non-systemic fungicide for management of web blight of urdbean [Vigna mungo (L.) Hepper]. Five systemic fungicides viz., propiconazole, hexaconazole, carboxin, ridomil and carbendazim were screened at 5, 10, 15 and 20 ppm concentration, whereas, five non-systemic fungicides viz., captan, thiram, propineb, mancozeb and zineb were screened at 25, 50, 100 and 400 ppm concentrations against Rhizoctoni solani for their antifungal activity. Among systemic fungicides carbendazim and propiconazole were found highly effective in reducing the radial growth of R. solani by 93.33%, whereas, ridomil was found less effective in reducing the radial growth i.e. 88.26% at 20 ppm. Mancozeb and propineb were found highly effective non-systemic fungicides in reducing the radial growth of R. solani (91.47 and 90.47% respectively at 400 ppm). Based on effectiveness of fungicides in vitro, they were further tested under in vivo conditions. Foliar spray of carbendazim was observed superior over other treatments giving 85.77% reduction in disease severity, maximum grain yield (1590.45 kg/ha) and test weight (25.65 g) followed by propiconazole.