oak decline

Oak pests and diseases

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Oak mildew

Oak mildewOak mildew is caused by the fungus Erysiphe alphitoides. It was first found in England in 1908 and is now common throughout Europe.

It infects younger leaves and soft shoots, especially the second growth of leaves in summer. Its severity varies according to the weather conditions in a particular year, and it is worst during warm, wet summers when humidity is high.

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