Holly Bush Disease
We have a coal dust type covering on our holly bush and 2 bay tree leaves this year. Can you please tell me what it is and how to treat it? Thank you.
Certified GKH Gardening Expert
It sounds like sooty mold, which is a symptom of several kinds of pests that can attack hollies. I recommend treating the plants with neem oil. This will kill any pests on the plant and treat the sooty mold as well. This article will help: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm