Thiophanate methyl 45% + Pyraclostrobin 5% FS: A new molecule for potato tubers treatment against black scurf disease caused by Rhizoctonia solani
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Keywords:Black scurf, Rhizoctonia solani, potato, fungicides, disease severity
AbstractBlack scurf of potato caused by Rhizoctonia solani is one of the most important limiting factors for potatoÂ production in India and worldwide. Field experiment was conducted using new molecule: thiophanate methylÂ 45% + pyraclostrobin 5% FS during two consecutive years (2012-2014) for the management of black scurf diseaseÂ of potato. It was evaluated at four doses i.e., 10.0, 12.0, 16.0 and 20.0 ml per 100 kg tubers for bioeffcacy andÂ two doses (20.0 and 40.0 ml/100 kg tubers) for phytotoxicity. The results revealed that thiophanate methyl 45% +Â pyraclostrobin 5% FS @ 20.0 ml/100 kg seed was highly effective and resulted in reduction of disease incidenceÂ (83.7% during 2012-13 and 67.5% during 2013-14) and disease severity (82.6% in 2012-13 and 60.4% in 2013-14) with higher yield followed by 16.0 ml/100 kg seed. The percentage of plant emergence was > 95% at differentÂ doses of the fungicide. No adverse effect on emergence (%), and phytotoxicity was observed when the combinationÂ product was tested at 20.0 and 40.0 ml/100 kg tubers.
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