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Symptoms: Spots on leaves. Entire shoot may turn black and die. Cankers develop along stem. Stem may fall over. Wet rot at crown. Photo by Frank Pfleger. |
Phytophthora blight, or tip blight, affects the stems, buds, and leaves of peony. It may be confused with Botrytis blight, but unlike Botrytis it does not produce fuzzy fungal spores in wet conditions. |
Symptoms: Spots on leaves. Entire shoot may turn black and die. Cankers develop along stem. Stem may fall over. Wet rot at crown. Photo by Frank Pfleger. |
| Causal organism: | Phytophthora cactorum |
| Over wintering: | In plant material and debris |
| Months of infection: | Growing season |
| Method of dispersal: | Wind |
| Infection point: | Roots and stems |
| Control: | Remove infected plants including adjacent soil. Plant healthy plants in new locations with well-drained soil. |
| Labeled fungicides: (First Application) |
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