|Alternaria Flower Blight||Flowers turn black.||Alternaria||Apply a fungicide to protect plants.|
|Botrytis Blight||Bud scales and stems turn ash-gray and stems die.||Botrytis cinerea||Space plants to insure good air circulation. Maintain low humidity. Avoid watering late in the day. Remove crop debris. Apply a fungicide to protect plants.|
|Phytophthora Crown Rot||Plants wilt. Stems at the soil level have a wet rot. Plants die and are easily pulled up.||Phytophthora nicotianae||Plant in pasteurized soil. Apply a fungicide to protect plants.|
|Pythium Root and Stem Rot||A wet rot develops at the base of young plants. Leaves yellow, wilt and die.||Pythium spp.||Plant in pasteurized soil. Do not overwater or overfertilize plants. Apply a fungicide to protect plants.|
|Rhizoctonia Stem Rot||Stems rot at the soil level, split longitudinally and have a dry, shredded appearance but are not easily pulled out.||Rhizoctonia solani||Plant in pasteurized raised beds. Apply a fungicide to protect plants.|
Prepared by Gary W. Moorman, Professor of Plant Pathology
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Issued in furtherance of Cooperative Extension work, Acts of Congress, May 8 and June 30, 1914, in cooperation with the U. S. Department of Penn State College of Agricultural Sciences research and extension programs are funded in part by Pennsylvania counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture.
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