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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ANSWERS
Alisma
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:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm
https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm

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