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Symptoms: Brown necrotic spots occurring on the leaves of lower branches. Photo by Chad J. Behrendt |
Ash anthracnose is a fungal leaf disease that occurs frequently on the lower leaves of ash trees, but does not cause serious harm to the tree. |
Symptoms: Brown necrotic spots occurring on the leaves of lower branches. Photo by Chad J. Behrendt |
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Symptoms: Curling of leaves due to infected leaf margins. Photo by Chad J. Behrendt |
| Causal organism: | Gloeosporium aridum |
| Over wintering: | In plant material and debris |
| Months of infection: | May to June |
| Method of dispersal: | Rain and wind |
| Infection point: | Leaves |
| Control: | Rake all leaves in the fall. Prune out dead or dying branches. Increase tree vigor through proper watering, fertilizing, and mulching. |
| Labeled fungicides: (First Application) |
Thiophanate-methyl (Cleary's 3336) Chlorothalonil (Daconil 2787) (May or June) |
| Comments: | This disease is common throughout Minnesota and is most severe during cool, wet weather. |
| For additional info | Back to Ash Diseases |