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Anthracnose (fungus) |
Tan, brown or purple spots on leaves. |
Refer to the PDC Fact Sheet "Leaf Spot Diseases of Shade Trees and Ornamentals" for more information. Remove and destroy fallen leaves. If serious, use thiophanate-methyl. Make first application at bud breakand the second 10 to 14 days later. Under wet conditions, apply a third spray 10 to 14 days later. |
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Bacterial leaf spot (bacterium) |
Small, water-soaked circular spots that eventually turn brown to purple. Twigs may become girdled, resulting in a blight. |
Prune and remove affected parts. Apply a copper fungicide several times at 10-day intervals, beginning when leaves emerge in the spring. |
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Powdery mildew (fungus) |
Whitish, powdery mold on leaves. |
If serious, apply fungicide spray at 7- to 10-day intervals. Use myclobutanil, triadimefon or wettable sulfur (95%) or lime sulfur. Start when mildew begins to appear on leaves. |
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| University Outreach and Extension does not endorse commercial products. Follow the label on all pesticides. |
