leaf drop on Indian Hawthorn
I've got a number of Indian Hawthorn that were planted before I bought my house. They are all in full sun and have been there ten years. For the last two or three years, they have dropped all or most of their leaves, with what looks to be a form of blackspot. Don't know if that's the cause or if this is typical. In zone 7b in Atlanta, so they get really good sun, which Hawthorns need. I haven't sprayed at all for blackspot, but I suppose I could extend my Banner Maxx after i spray my roses. Any help?