The reaction of Prunus avium clone F12/1 plants inoculated with PNRSV isolates from different species of Prunus and rose plants.

The reaction of Prunus avium clone F12/1 to Prunus necrotic ringspot virus (PNRSV) isolates was determined. 12 PNRSV isolates from five Prunus species and three isolates from field-grown rose cultivars were investigated. Isolates PNRSV-PL7 or PNRSV-PL21 from plum trees cultivar ‘Empress’ did not infect P. avium clone F12/1. Plants of this clone were infected by isolates from almond, apricot, peach, plum (cvs. ‘Bluefre’, ‘Opal’), sour-sweet cherries and rose. Some differences in pathogenicity of 12 isolates to P. avium clone F12/1 were observed. The tested clone F12/1 can be a new host-plant for differentiating pathogenicity of PNRSV rose isolates.