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Degrees of powdery mildew severity (means ± standard errors of the means [SEM]) on leaves and on clusters during the course of the 2007 growing season in three vineyards (VLZ, PYM, and RXM) of southern France. The diseased areas of leaves and clusters are expressed as percentages of the total leaf and cluster areas. Numbers at the top of the figure indicate the developmental stages according to the BBCH scale (21). Dates are given as month/day.
