I recently inspected several cork oak, coast live oak, mayten, bay laurel, and cedar trees that I treated with fire mimicry methods in February of this year. The positive responses of these trees to the treatments after just six months are pleasantly surprising. The photos below tell the happy story . . .
Sudden Oak Life by Lee Klinger 
Lee, you once suggested fire mimicry might be useful in UK with Ash. Any takers on that….and do you still think the same?
No takers. And yes, I’m pretty sure this approach would improve ash health.