Internode lesions (%) on the green stems of ten progenies from the F1 family of ‘Chardonnay’ × V. cinerea B9, after inoculation with D. ampelina in the greenhouse. The proportion of stem surface, spanning the four assessed internodes, covered by lesions was visually estimated at 30 d post-inoculation. ‘Parents’ are pooled values for Chardonnay and V. cinerea B9. Numbers at the base of each column are field ratings of disease severity on canes (on a scale of 0–3, Fig. 1). Each column is the mean of three observations, averaged across three replicate experiments (24 plants per genotype per experiment). Error bars are 95% confidence limits. Columns with overlapping error bars are not significantly different (p < 0.05; Tukey’s test)