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Arasan asters Avoid overhead watering bacteria bacterial wilt bacterium BLIGHT Bordeaux Botrytis cinerea buds bulbs calomel canker captan causal fungus chloropicrin clean or sterilized copper sulfate corms corrosive sublimate damping-off Destroy affected disease appears disease is present disease is severe diseased plants Dithane Z 78 dust ferbam ferbam l lb fixed copper formaldehyde fungi Fungicide Fusarium wilt gallons of spray gladioli gray mold growers growing plants growth inch infected leaves infected plants intervals as long keep humidity low l0-day intervals l00 gallons leaf spot leaves turn yellow lesions lg lbs methyl bromide mosaic petals pint Plant in clean plants as soon powdery mildew Remove and destroy Rhizoctonia rhizomes root rot rust rust fungus scab seedlings Semesan SP0T spores spray at weekly spray lime spread STEM R0T sterilized soil streaks stunted sulfur 2 lbs sunken symptoms Take cuttings temperatures trade names Treat seed Verticillium water-soaked weekly intervals zineb Ziram