Abstract
Abstract Watermelon mosaic virus (WMV) often suppresses yield and shortens the harvest season of yellow summer squash (Cucurbita pepo L.) in the Midwestern United States. Two WMV-susceptible cultivars, ‘Multipik’ and ‘Cougar’, and two cultivars with transgenic resistance to WMV, ‘Patriot II’ and ‘Liberator III’, were evaluated for net photosynthesis (Pn), marketable yield, and farm-gate revenues under high WMV disease incidence during fall 2000 and 2001. Foliage samples were collected from the experiment and tested by enzyme-linked immunosorbent assay (ELISA) for five common cucurbit viruses, and only WMV was found. Pn rates were much lower for ‘Multipik’ and ‘Cougar’ compared to the WMV-resistant cultivars after the initial sampling date (early September) in both years. Fruits and foliage of the resistant cultivars never displayed symptoms of WMV. For the susceptible cultivars, the cumulative marketable yields of ‘Multipik’ were substantially lower than ‘Cougar’. The marketable yield of the best WMV-resi...
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