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Abstr affected Alternaria anthracnose appear areas aster attacked azalea bacterial leaf spot bacterium basal rot become benomyl BLIGHT Symptoms bordeaux mixture Botrytis blight Botrytis cinerea Brierley buds bulb rot bulbs canker carnation causal fungus caused chloropicrin chlorotic chrysanthemum color control measures corms crown rot cuttings dark brown develop dieback discoloration diseased plants dust F. F. Smith fected ferbam Florists flower foliage fungi fungicides Fusarium wilt gallons of water geranium gladiolus green greenhouse Growers growth healthy plants humidity infected plants LEAF SPOT Symptoms lesions lily maneb mosaic mycelium narcissus necrotic normal occur petals petioles Phytopathology Phytophthora poinsettia powdery mildew produces Pythium Remove and destroy Reptr Rhizoctonia rhizomes root rot roses rust sclerotia shoots snapdragons soft rot soil spores spray spread steam sterilized streaks stunted sulfur sunken surface tion tips tissue turn yellow usually vascular Verticillium viruses water-soaked wettable WILT Symptoms zineb