Q.Black Growth on Leaves
My gardenia plant and grapefruit tree have a black growth covering the leaves. What is it?
Nikki
Certified GKH Gardening Expert
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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