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Disease Note

Bursaphelenchus xylophilus Found in Pines in Southern Ontario. J. Juzwik, Pest Control Section, Ontario Ministry of Natural Resources, Maple, Ont. L0J 1E0. D. T. Myren, Forest Insect and Disease Survey Unit, Canadian Forestry Service, Sault Ste. Marie, Ont. P6A 5M7. Plant Dis. 70:78. Accepted for publication 5 September 1985. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-78d.

Bursaphelenchus xylophilus (Steiner & Buhrer) Nickle, the pinewood nematode, is widespread in the United States but has been reported in Canada only from the Belair Provincial Forest in Manitoba. In Ontario, during July 1984 and from November 1984 to February 1985, wood samples were collected from recently killed pines in four locations in the southern portion of the province and examined for the presence of B. xylophilus. One of the sampled trees had been killed by lightning but the cause of death of the others was not determined. The nematode was recovered from samples of red pine (Pinus resinosa Ait.) collected in plantations in the York Regional Forest near Toronto, the Limerick Forest near Brockville, and a private plantation near Port Perry. Samples positive for B. xylophilus were also collected from a variety of Austrian pine (P. nigra var. cebennenis (Gren. & Godr.) Rehd) that had been planted in an experimental area in Turkey Point Provincial Park near Simcoe. Nematode identification was completed by R. V. Anderson, Biosystematics Research Institute, Ottawa, Ont.