It has been recently been reported in the Washington Post that an unknown pathogen is killing Beech trees by destroying leaves. The disease causes leaves to blacken between the leaf veins, creating a striped effect; the leaves then shrivel and die. It can effect Beech trees of all ages.
The US Forest Service has recently released $156,000 to research the cause. There may be a link to minuscule nematodes found in New Zealand and Japan.
Anyone noticing this disease in the UK should report it to Forest Research using their Tree Alert service.
Thanks to Len Phillips for sharing the article.