disease stone fruits bacterial canker caused by Pseudomonas syrigae pv. Syringae and disease bacterialblight caused by Xanthomonas arboricola pv. juglandis, were studied. Different concentrations ofoxide nanoparticles had more inhibitory effect on bacteria X.arboricola than on bacteria P.syringae, andzinc oxide nanoparticles in the prepared concentrations almost had no inhibitory effect on bacterial