Lemon Trees

Lemon Tree in a Container

Carole-griffin added on March 31, 2017 | Answered

Some of the leaves are showing blackish patches which look like a mould of some kind. What can I do?

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Certified GKH Gardening Expert
Answered on March 31, 2017

This is likely sooty mold, a fungus that grows on honeydew, a sticky substance left by certain insects. The best way to control it is to control the insects:

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