Flower petal spots are at first water-soaked but become tan. Infected crowns, petioles, and developing flowers are covered with gray fungal growth. Botrytis cinerea Reduce the humidity in the greenhouse. Space plants to insure good air circulation. Apply azoxystrobin, chlorothalonil, copper, fludioxonil, iprodione, or vinclozolin to protect healthy plants.
Infected plants become very yellow.
Vascular tissue in the corm turns dark brown to black. Mature plants wilt and die. Fusarium oxysporum f. sp. Discard infected plants. Leaf Spots Yellow or brown or gray circular spots develop on leaves and may have a zonate pattern within them.