Plant-Parasitic Nematodes in Orchards of the Okanagan Valley of British Columbia, Canada. T. C. Vrain, Agriculture Canada Research Station, 6660 N. W. Marine Drive, Vancouver, BC V6T 1X2. J. M. Yorston, British Columbia Ministry of Agriculture and Food, Box 639, Penticton, BC V2A 6P1. Plant Dis. 71:85-87. Accepted for publication 11 June 1986. Copyright 1987 Department of Agriculture, Government of Canada. DOI: 10.1094/PD-71-0085.

Plant-parasitic nematodes were identified from 194 samples of soil and roots of apple, peach, pear, apricot, cherry, and prune orchards in the Okanagan Valley of British Columbia. Seven species of nematodes usually associated with damage to fruit trees were found. Paratylenchus projectus was found in 20% and Pratylenchus penetrans in nearly 80% of the samples. The greatest prominence values of P. penetrans were in apple and cherry orchards. Xiphinema occiduum, a new vector of nepoviruses, was detected in several orchards.