I have two Holly bushes that have developed what I think is fungus. The underside of the leaves have long white spots. When I shake the branch, small particles fly off. Do you know what it could be and, if so, how do I take care of it? Thank you.
Certified GKH Gardening Expert
Are the spots powdery in nature. If so, it is is powdery mildew and can be treated with neem oil. Here is more info: https://www.gardeningknowhow.com/problems/get-the-cure-for-powdery-mildew.htm https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
In addition, it could be scale or mealybugs, which can also be treated with neem oil. These articles should help: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm