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agriculture biology chlorosis closeup control danger disease diseased farming flower fungal fungi fungicide fungus gardening green grow home and garden infection infest leaf leaf spots macro microorganism mold mould nature necrosis parasite pathogen pathology pest pesticide phragmidium mucronatum phragmidium tuberculatum phytopathology plague plant plant pathology plant protection problem pustules repellent rosa rose rose rust spores spot summer symptoms

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