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Smut, incited by Sporisorium scitamineum, is one of the major diseases of sugarcane causing economic yield losses to sugarcane growers as well as sugar industry. A field trial was conducted for three consecutive seasons from 2017-18 to 2019-20 at RARS, Anakapalli to test the efficacy of seven fungicides against whip smut of sugarcane. In plant crop, three budded setts of the smut susceptible cultivar, CoA 92081, were artificially inoculated with smut spore suspension for 30 minutes followed by dipping in fungicidal solution for 15 minutes prior to planting. In ratoon crop, the fungicidal treatments were imposed by spraying of fungicides immediately after ratooning followed by second spray at 30 days after ratooning. Smut incidence was recorded at fortnightly interval from first smut whip emergence till harvest. The experimental results revealed that sett treatment with azoxystrobin + tebuconazole @0.1% has recorded significantly lower incidence of smut in plant crop compared to other treatments but was on par with trifloxystrobin+tebuconazole@0.1% and propiconazole@0.1% treatments. In ratoon crop, spraying with tebuconazole @0.1% or trifloxystrobin+tebuconaole @0.1% was found effective against whip smut disease with less disease incidence and higher cane yield compared to other treatments. Overall results of plant and ratoon crop indicated that sett treatment with azoxystrobin+tebuconazole at the time of planting and spraying of tebuconazole twice, i.e., first spray at ratoon initiation and second spray at 30 days after ratooning was proved effective in the management of whip smut in sugarcane.

Field evaluation of fungicides for the management of whip smut in sugarcane caused by Sporisorium scitamineum