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Differences among oak leaf flushes (Quercus robur) in infection by oak powdery mildew (Erysiphe spp.) on the (a) upper and (b) lower leaf side of the pedunculate oak Quercus robur during the early, mid and late season. Bars represent means and error bars represent standard errors. Significant differences among leaf flushes in each season are indicated by letters above bars (P < 0.05), with statistical details provided in Supporting Information Table S25.
