The powdery oak mildew fungus is thought by some to be a serious threat to oak trees in this country. It thrives in mild, overcast conditions and usually appears in the latter part of the summer.
It shows as a white powder affecting young developing leaves and shoots, and in bad cases it can kill the shoots.
You can recognise that powdery mildew has been at work on an oak tree by the bare twigs projecting out of the crown.
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