I have this on a close clump pf trees. I believe it to be HYPOXYLON CANKER. It is covering the trunks extensively. Do I need to destroy the affected trees?
I'm no expert on this subject , but your tree does appear to be infected with Hypoxylon Canker .
The host tree will die anyway ; best get rid probably by burning all affected wood .
Best not taken to a green-waste site for obvious reasons .
Scariff, County Clare, Ireland
Where are you based? The Internet suggests it's an important disease of poplars in Canada, but it's not something we know a lot about in Britain.
"The one who plants trees, knowing that he will never sit in their shade, has at least started to understand the meaning of life." Rabindranath Tagore
East Sussex. Thanks. I will seek further specialist advice on next steps.