Gray mold caused serious losses to some greenhouse growers of raspberries in Iowa last year. Gray mold or Botrytis blight is caused by the fungus Botrytis cinerea, which has a wide host range with over 200 reported hosts among ornamentals plants, vegetables and fruits. In addition, Botrytis can cause different kinds of plant diseases, attacking seedlings, flowers, fruits, stems and foliage. It is also a major cause of postharvest rot in fruits. The disease can occur in the greenhouse as well as in the field when weather is humid and cool.