My Holly Bush has white on the underside of the leaves. I have 2 holly bushes, one has white chalky marks on the underside of the leaves, and a bit on the stems. What is this and how can I treat it? Thanks.
My Holly Bush Has White on the Underside of the Leaves
Certified GKH Gardening Expert
It is possible that it is scale or mealybugs. I like to treat both with neem oil. It is very effective and safe. These articles will help:
If it's powdery, it is likely powdery mildew. Powdery mildew is caused by fungus that attack Holly leaves, sometimes covering them entirely with a thin white powdery coating. For more information, here is an article that you may find helpful: https://www.gardeningknowhow.com/problems/get-the-cure-for-powdery-mildew.htm