Abstract
Cucurbit downy mildew, caused by the oomycete pathogen Pseudoperonospora cubensis, is among the most devastating diseases of fall cucumber crops in the northeastern United States. Symptoms include angular, vein-trapped lesions on undersides of leaves that are initially water-soaked and develop fuzzy gray sporulation under humid conditions. Diseased foliage becomes quickly necrotic. This report evaluates the resistance to cucurbit downy mildew of 11 cucumber cultivars (Cucumis sativa ‘SVCS0415’, ‘SVCS0029’, ‘SVCS0025’, ‘TSX-CU254’, ‘TSX-CU252 AS’, ACU-2083’, TSX-CU253 AS’, ‘EWS-CU-059’, ‘Chaperon’, ‘Gateway’, and ‘Marketmore 76’). The trial was conducted in 2024 in South Deerfield, MA. Results from this trial will help cucumber growers select appropriate resistant cultivars for fall production, when downy mildew pressure is high.
Published Version
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