Posted: 25/05/2012 at 22:33
The canker that affects cherries is specific to prunus species, so cherries, plums, apricots, peaches etc., although there are other cankers that will affect other trees.
The infecting agent is found on the surface of leaves and can enter through the leaf pores; cankers develop when the same bacteria gain access to the tree via the holes left by fallen leaves at leaf fall or wounds in the bark. Hence no, the infection does not travel under the bark. It is important, however, not to spread the infection by pruning trees without cleaning the secateurs/cutters carefully between trees and between cuts.