|Bacterial Leaf Spot||Water-soaked spots with yellow halos spread rapidly on leaves. Centers of the spots fall out under wet conditions.||Pseudomonas cichorii||Avoid overhead watering. Discard infected plants.|
|Pythium Root Rot||Cuttings have poor root systems and yellow leaves. Leaves of established plants yellow and die. Stems have a mushy black rot.||Pythium||Plant in a potting mix free of pathogens. Apply a fungicide to protect plants.|
|Rhizoctonia Stem Rot||Stems at the soil level are killed. Under wet conditions, a fine webbing of fungal growth can be observed on the soil surface near the infected stems.||Rhizoctonia||Plant in a potting mix free of pathogens. Apply a fungicide to protect plants.|
Prepared by Gary W. Moorman, Professor of Plant Pathology
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