something is killing my hawthorn bush

Question

It seems that something is eating the root

Answer 1

Your hawthorn bush could be infected with a fungus that causes root rot. You should consult with a local extension service for advice on whether you need to remove the bush entirely. This article may be helpful: https://www.gardeningknowhow.com/plant-problems/disease/armillaria-root-rot-control.htm