Somethings Attacking My Holly
I have had holly bush for over a year now. And over the year they get a white powder and little black or dark brown tiny spores from what I have been told. I don't think it's black spot. I have cleared old straw and keep it clean. The bottoms I keep clean and dry. I have used sprays for fungus. What can it be?
Certified GKH Gardening Expert
The white powder you describe is 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 or two that you may find helpful: https://www.gardeningknowhow.com/problems/get-the-cure-for-powdery-mildew.htm
The black substance 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/plant-problems/pests/pesticides/neem-oil-uses.htm