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Silicon (Si) application to miniature potted roses can decrease severity of powdery mildew (Podosphaera pannosa) and this is associated with increased accumulation of callose and hydrogen peroxide (H O ) as well as hypersensitive (HR) cells. We used microscopy, gene expression and specific inhibitors of callose and H O to determine how effective these plant responses are in stopping infection. Pathogen arrest in Si-treated (Si+) plants was accompanied by increased accumulation of callose and H O in papillae and HR cells, respectively. Th