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5 pictures total.
Oak leaf blister symptoms.
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| Severity: | 2 out of 5 |
| Frequency: | 2 out of 5 |
| Symptoms: | The infection site bulges upward on the upper surface and is sunken on the lower leaf surface. The infected area starts out tan and turns brown as the disease progresses. |
| Cycle: | The fungus overwinters on twigs and bud scales and infects new leaves while they are emerging from the bud when there are mild and moist conditions. |
| Management: | At this time, no chemical control is really necessary in the Midwest since this disease does not cause enough damage to justify a preventive fungicide treatment. |
| Associated trees: | |
