Grapefruit Trees
Q.

Black Growth on Leaves

Anonymous added on March 7, 2011 | Answered

My gardenia plant and grapefruit tree have a black growth covering the leaves. What is it?

A.
A.Answers to this queston: Add Answer
Nikki
Certified GKH Gardening Expert
Answered on March 8, 2011

Your problem could be attributed to sooty mold, which is often caused by pests. This article will help you learn more:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

You can treat this with neem oil. It gets rid of both the fungus and the pests that cause the fungus. Here is more info on neem oil:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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