My trees have a fungus. What do I need to spray or dust with? I think it is a blight.
Certified GKH Gardening Expert
You can use copper sulfide or neem oil. I personally like neem oil, as it is also a pesticide but does not hurt bees. Here is more information on it: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm