Q.My Hawthorn Tree Leaves Have Black Spots And Shriveled And Already Shed From The Tree
What is it and how should a treat it?

Certified GKH Gardening Expert
Hawthornes are susceptible to several diseases that affect leaves including leaf spots, leaf blight, and fire blight. Your tree has some of the symptoms of fire blight such as the burned looking edges on leaves and the reddish stains on the trunks. Here is more information that should help:
https://www.gardeningknowhow.com/plant-problems/disease/fire-blight-remedies-and-symptoms.htm
https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm
https://www.gardeningknowhow.com/plant-problems/disease/cedar-hawthorn-rust-disease.htm