Hope some of you knowledgeable people can assist me on this one? I have a small woodland 4 1/2 acres of predominately Ash and i have notice a few of the trees suffering from canker. One in particular was quite bad (pic 1)and lost a couple of limbs over the winter. Whilst chopping the cankered tree yesterday i noticed this split on the bark of it's neighbour (pic 4-5) Is this canker? What is the best option? Is it possible to help it or better to take it down? Any and all advise greatly apprecia