Lemon tree in a container

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

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1 Comment To "Lemon tree in a container"

#1 Comment By Alisma On 03/31/2017 @ 2:30 pm

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 ^[1]
https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm ^[2]

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[1] https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm: https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

[2] https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm: https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm

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