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I have a really big Oak Tree growing in our garden, it is probably 25 years old, but it has a black coating on the bark, trunk and branches in the winter it washes off on to the plants underneath, can I treat this or is it ok just to leave??

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The black coating you describe sounds like Black sooty mould. Yates Bug Oil controls the sucking insects that produce honeydew on which sooty mould grows. So I would recommend you treat the tree to control.

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