oak trees

Prime time to spot Oak mildew

It is one of the commonest diseases of Oak leaves, and right now, Oak mildew is particularly visible thanks to the cold spring and early summer heatwave.

The disease, caused by the fungus Erysiphe alphitoides, attacks young leaves and sometimes the young shoots, and is characterised by a white or greyish-white powdery coating on leaves and shoots.

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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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