Tulip fire or Botrytis blight is caused by the fungus Botrytis tulipae. It attacks all parts of the plant and is by far the most common and serious disease wherever this popular flower is grown. Once a tulip bed is infested, fire or Botrytis blight generally becomes more serious in succeeding crops. The disease commonly follows frost or hail injury. If not controlled, tulip fire can cause an almost complete loss of flowers and greatly reduce the yields of bulbs during cool, wet spring weather. Attacks are confined to the tulip (Tulipa gesneriana), other Tulipa species, and hybrid tulips. All commercially grown tulip cultivars and species are susceptible to some degree.