By Humbugsuki
United Kingdom 
I have two pink Hawthorn trees in their twenty forth year and in the last three years they have come into leaf as they should, but immediately the leaves develop brown spots then wither and throw all their leaves. Any answer to this or any solutions PLEASE. Frustrated but very keen gardener. thank you. Ian Mortimer
9 Jul, 2015
Hi, welcome to GoY, sorry for the delay in you're getting a comments, Ive just noticed that this question has gone unanswered for some time.
The symptoms you describe, could be a number of things, so instead of going through them, I'll give you a link to look at.
http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/hawthorn-diseases
this should give you some help, Derek.
27 Jul, 2015