posted 5 years ago
does your tree have fungus on it? i have peaches, cherries and apples
i'm probably a couple hundred miles south of you and i just leave the trees alone, give them fertilizer in spring, do pruning/trim off excess branches when purple flowers come out. i dont spray with anything, i'd rather eat around the worms than have to try and fight off cancer caused by my own hand.
as a rule if your going to fertilize do it in spring, if new growth happens too close to dormancy, the new growth might die off in winter.
protect from deer, clean up leaf litter, keep the voles out of roots and you should be good.