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agriculture biology blight closeup control danger disease diseased downy mildew erysiphe heraclei farming flower foliar fungal fungi fungicide fungus gardening green grow home and garden infection infest leaf macro microorganism mildew mold mould nature outbreak parasite parsley pathogen pathology pest pesticide petroselinum crispum phytopathology plague plant plant pathology plant protection problem pustules science spores spot summer symptoms

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