I have a hedge of photinia. We have had 20+ days of rain here in NJ. About a month ago, the photinia developed the fungus your website describes. How do I treat the fungus? Please advise as I am desparate.
Certified GKH Gardening Expert
Treat the plant with neem oil. It is both a fungicide and a pesticide. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm