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| Leaf scorch, winter injury of evergreen species (nonparasitic) |
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Leaves yellow and droop during dry periods. Leaves develop large, irregular brown area. |
Water during periods of moisture stress. Fertilize to keep trees vigorous. If practical, apply foliar antidesiccant to evergreen species in winter. |
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Powdery mildew (fungus) |
Powdery, grayish-white patches on leaves and young shoots. |
Collect and remove fallen leaves. Usually, chemical control is not necessary. |
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Frost injury (nonparasitic) |
Flower buds or flowers appear blackened or blighted on species that bloom in early spring. |
No control possible. |
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| University Outreach and Extension does not endorse commercial products. Follow the label on all pesticides. |
