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?

A.
A.Answers to this queston: Add Answer
GKH_Susan
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.

https://www.gardeningknowhow.com/edible/fruits/citrus/sooty-mold-on-citrus-trees.htm

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