Apreliminary investigation showed 14 kinds of diseases present on the Naiplum(Prunus salicine Lindl.var.cordata J.Y.Zhang et Y.)in Hunan province.The kindsand severities of the diseases varied greatly from area to area.Of the found diseases,baterialleaf spot or black fruit spot(Xanthomonas campestris pv.pruni)and Cercospora Leaf spotare major ones.Agrobacterium tumefaciens,Cladosporium sp.,and Ploystigma r...