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Lemon Trees

Q.black soot? on lemon leaves

Zone 92586 | Anonymous added on September 21, 2019 | Answered

What is the black soot looking substance on my lemon tree leaves?

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Certified GKH Gardening Expert
Answered on September 22, 2019

Probably sooty mold growing on the honeydew excretions from an insect pest, aphids or scale. The sooty mold is not pathogenic/harmful. Control the insect pest and eventually the sooty mold will clear up.


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