detection and distribution of pnrsv on stone fruits in golestan province

in recent years symptoms of virus diseases on stone fruits have been observed in wide range in golestan province. in order to study the important viruses on stone fruits cherry plum nectarine peach and apricot trees with symptoms such as mosaic chlorosis ring spot shot hole pale margins in leaves and dwarf in trees sampling was done during 2005. putative infected plants were tested by das elisa kits respected to pnrsv (prunus necrotic ring spot virus) ppv (plum pox virus) pdv (prune dwarf virus) clrv (cherry leaf roll virus) and armv (arabis mosaic virus). positive results were obtained for pnrsv in peach nectarine and plum but not in cherry and apricot. the most infected regions were aliabad and gonbad with the highest infection rate in foreign cultivar peach (6.55%) and red gold nectarine (3.22%).