Plum pox is a serious viral disease of stone fruit species that was detected, in 1999 for the first time in North America, in a Pennsylvania orchard. The plum pox virus (PPV) can be transported long distances in infected plant material and is transmitted from infected trees by insects or by grafting or budding. PPV occurs on Prunus species including peaches, nectarines, apricots, plums, almonds, cherries, and some ornamental Prunus cultivars. PPV does not kill trees, but it reduces the yield and marketability of fruit. In addition, PPV does not affect human or animal health. PPV-D, the only strain of PPV detected in the United States was originally described from Europe, is not the most virulent of plum pox strains, and does not appear to infect cherry species. Control and prevention measures for PPV include field surveys, use of certified nursery stock, use of resistant varieties (when available), control of aphid vectors, elimination of infected trees, and enforcement of domestic and international quarantine regulations.
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