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(A). Zucchini leaves with symptoms of powdery mildew caused by P. xanthii. (B). Application of sterile water for rinsing off spores. (C). Spraying of spores on healthy seedlings previously treated with P. variotii (PAE) or water (T0). (D). Arrangement of leaves to determine the affected leaf area. (E,F). Distribution of seedlings during the different assays.
