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PVY and Canadian experience.
M. SINGH (1), X. Nie (2), Y. Pelletier (2), M. Fageria (3). (1) Agricultural Certification Services/PotatoesNB, Fredericton, NB, Canada; (2) Agriculture and Agri-Food, Potato Research Centre, Fredericton, NB, Canada; (3) Agricultural Certification Services, Fredericton, NB, Canada

<i>Potato virus Y</i> (PVY) is an evolving problem throughout the world and Canada is no exception. PVY made headlines in Canada in 1990s when PVY<sup>N</sup> was discovered in Eastern Canada, which resulted in the loss of export markets. Since then significant progress has been made in PVY research. PVY is managed in seed potatoes by visual inspection during growing season followed by post-harvest test. A national survey conducted in 2004-06 revealed that all strains of PVY were present but PVY<sup>O</sup> was the predominant strain, which was further confirmed by a survey conducted in New Brunswick in 2009. The responses of 14 potato cultivars to five isolates belonging to four PVY strains varied significantly, ranging from local lesions to systemic necrosis and tuber symptoms depending on potato cultivar and virus strains. Field experiments on the current season PVY spread and the transmission risk by aphid species unveiled the presence of few potato colonizing aphids but many non-colonizing species, and among them, several were found to be PVY-positive by RT-PCR. Current season spread of PVY in the fields increased as the crop season progressed, and reached up to 40% at the time of harvest in some fields. PVY incidence determined from developing tubers exhibited a significant positive correlation with that from tubers after harvest using real-time RT-PCR. Application of mineral oil spray along with insecticide was found to be a very effective tool for the management of PVY in a growing crop.<p><p>Keywords:

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