Our apple trees have had canker for a number of years and at this time, every year, I religiously cut out all the infected bits and treat the pruning wounds.
This doesn't seem to be doing much good though - if anything the canker is worse this year. I will have to resort to spraying I think.
I have read around this and have found various suggestions including bordeaux mixture and systemic fungicides.
Anyone done this - ideas please regarding products to use and timing.