The extremely susceptible phenotype observed in progeny that did not inherit a resistance allele was not typical of Phomopsis cane and leaf spot symptoms or fruit symptoms seen in commercial vineyards. This may be expected, since cultivated and bred grapes have been subjected to selection, which may have purged these extremely susceptible phenotypes. As an example, in cultivated grapevines, D. ampelina fruit infections initiated at the pedicel are typically latent during most of summer and symptoms do not appear until harvest, when berries rot and black pycnidia form (Wilcox et al. 2015). At our field site, symptoms were unusually severe, with black lesions appearing on the berries and rachises drying even before veraison. In some cases, berries did not even expand, but instead remained stunted and became necrotic. We did not recover D. ampelina from symptomatic clusters, as we did from the canes; nonetheless, the correlation between cluster and cane symptoms was evident. The cane symptoms observed in the field started out as lesions on the green stems; levels of cane symptoms in the field and internode lesions in the greenhouse on genotypes were positively correlated under both conditions.