We live in Warsaw Poland and have 3 mature cherry trees in our back garden, the trees are all approx. 25-30 years old. They are all still fruiting each yr but seem to have some kind of disease - weeping sap. split trunks and branches and small to large lumps/growths on the branches. I'd like to confirm if this is Bacterial Canker or Bacterial Gummosis or some other problem. If so, should we spray them with copper sulphate, I've read this could effect next years fruiting. Thanks
More than likely black knot or bacterial canker. http://www.ces.ncsu.edu/depts/pp/notes/oldnotes/fd4.htm Cheers
