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

GKH_Susan
Certified GKH Gardening Expert
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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