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Figure 7: Leaf disks imaged and scored for disease severity. A leaf disk of 452036 (“Horizon” × V. rupestris B38) inoculated with Erysiphe necator isolate Musc4 was imaged and scored for disease severity successively at 2, 4, 6, and 9 days after inoculation (DPI). The images are overlaid with lighter shade to show subimages that were classified as infected (score > 0.50). The total percentage of infected leaf disk area, calculated as the percentage of subimages classified as infected, is given below each image.