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Abstr affected Anthracnose aphids appear areas aster attacked bacterial leaf spot bacterium basal rot become Blight Symptoms bordeaux mixture Botrytis blight Botrytis cinerea Brierley brown buds bulb rot bulbs canker carnation causal fungus caused chloropicrin chlorotic chrysanthemum color control measures corms cuttings dark develop dieback discoloration diseased plants dust F. F. Smith fected ferbam Florists flower foliage fungi fungicides Fusarium wilt gallons of water gladiolus green greenhouse Growers growth healthy plants humidity infected plants Leaf Spot Symptoms lesions lily margins moist mosaic narcissus necrotic normal occur petals petioles Phytopathology Phytophthora powdery mildew produces Remove and destroy Reptr Rhizoctonia rhizomes root rot roses rust sclerotia seed shoots soft rot soil spores spray spread steam sterilized streaks stunted sulfur sunken surface sweet peas tion tips tissue tulips turn yellow usually vascular velop Verticillium virus disease viruses water-soaked Wilt Symptoms zineb