Evaluation of valifenalate 6% + mancozeb 60% WG against downy mildew of cucumber

Abstract

Field studies were carried out to evaluate valifenalate 6% + mancozeb 60% WG against downy mildew of cucumber incited by Pseudoperonospora cubensis. The results revealed that, application of valifenalate 6% + mancozeb 60% WG at 3000 g/ha had recorded lowest downy mildew severity (7.99%) with maximum yield of 12.23 t/ha which was significantly superior over standard check and untreated control. Therefore valifenalate 6% + mancozeb 60% WG can be an additional option for effective management of downy mildew of cucumber in order to break the fungicide resistance development by the pathogen against mancozeb. Subsequent testing on phytotoxicity revealed that there were no visual phytotoxic symptoms observed during the experimentation.