Vern nailed it. It is bacterial and if it is a tree you want to save you have to cut all the nodules of this stuff out..pretty much butcher the tree. There are then sprays that will keep the tree from developing new Black knot, mosty sulphur based sprays..it is very common in fruit trees of that specie. Not impossible to save the tree but black knot will spread to other similair trees very quickly so act now or have a brush pile burn later
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