Disease Note

First Report of Zucchini Yellow Mosaic Virus in Ontario. L. W. Stobbs, Agriculture Canada, Research Station, Vineland Station, Ontario, L0R 2E0. J. G. Van Schagen, and G. M. Shantz. Agriculture Canada, Research Station, Vineland Station, Ontario, L0R 2E0, and Canadian HydroGardens Ltd., Ancaster, Ontario, L9G 3L1. Plant Dis. 74:394. Accepted for publication 9 February 1990. DOI: 10.1094/PD-74-0394C.

A potyvirus not previously reported in cucumber (Cucumis sativus L.) in Canada was isolated from commercial glasshouse cucumbers in Simcoe, Ontario, in 1989. Severe mosaic, yellowing, and distortion of the foliage and fruit occurred in close to 80% of the plants. On the basis of particle morphology, host range, symptomatology, mode of transmission, and serology, the virus was identified as zucchini yellow mosaic virus. The virus failed to react with antiserum to watermelon mosaic virus I, reacted weakly with antiserum to watermelon mosaic 2, and reacted strongly with antiserum to zucchini yellow mosaic virus. Greenhouse studies confirmed that the green peach aphid (Myzus persicae Sulz.) was an efficient vector for the virus.