Twenty-eight American peach cultivars were screened for their reaction to Plum pox virus (PPV). The cultivars were evaluated for the presence and intensity of PPV symptoms in leaves and fruits, and the relative concentration of PPV protein in flowers was determined by ELISA. The results allowed to divide the cultivars into four groups: cultivars Flame Prince, Cotender, Newhaven, Ruby Prince, Sun Prince, Jefferson, Camden and Jersey Queen were characterised as medium resistant to PPV; cultivars

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... oring, Blaze Prince, June Prince and Legend were classified as tolerant; cultivars Quachita Gold, O’Henry, Crest Haven, Biscos, Sentry, Fire Prince, Carogem, Carolina Belle, Redglobe and Harvester were rated as medium susceptible; and cultivars Bounty, Summer Prince, Gold Prince, Redhaven, Gala and Sunbrite were characterised as highly susceptible to PPV.