What is Plum Pox Virus (PPV)?

Plum pox is a devastating viral disease that threatens Niagara’s stone fruit industry. The disease is caused by the plum pox virus (PPV) of the genus Potyvirus. Plants that are susceptible to PPV include peaches, nectarines, plums, and apricots. Symptoms of plum pox include characteristic spots or “pox” on fruit, leaves, and stems, in addition to fruit deformities, a decrease in fruit yield, and premature fruit dropping. PPV is transmitted from infected trees by aphids, grafting, or budding. There is no known cure for PPV. Rather, management is focused on the destruction of all infected trees, incurring significant economic losses.

The Plum Pox Management and Monitoring Program (PPMMP) was implemented by the Canadian Food Inspection Agency (CFIA) in 2011 to counter the negative impact of PPV on Canada's stone fruit industry. The PPMMP consists of annual monitoring of orchard and residential properties within the PPV quarantine area (in portions of the Niagara Region and Hamilton), a propagation ban, and movement restrictions imposed on susceptible plant species.