Posted: 21/06/2013 at 14:04
The best thing to do would be to contact a good tree surgeon so he/she can establish how many of the trees are infected, but they can be expensive. You can look for a local tree specialist at www. tree-expert-finder.co.uk
Normally the infected bits are pruned and the prunings will be have to be removed from the site or burnt. Pruning tools should be desinfected immediately afterwards.
I wouldn't take the Pyracantha out just yet; I have one myself that shows all the symptoms every year but only in spring. During summer it normally picks up again. Roses and Ash are generally not infected. The Cotoneasters we have in our garden also have symptoms: there are a number of twigs that die back but that seems controlable by cutting them out as soon as I notice them. It's the fruit trees that are most often infected. I know that I would be inclined to remove the apple tree because of the large cankers on the trunk base.
I really wish I had some better news. It's so sad to loose established trees. Good luck Lulubella!