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松材线虫 Bursaphelenchus xylophilus(Steiner & Buhrer)Nickle,在美国是普遍发生的。但在加拿大仅在马尼托巴的贝策尔州报道过。1984年7月和11月到1985年2月间,在安大略南部地区的四个地方,收集了最近才死亡的松树木材标本,并对松材线虫存在作了检查,采集到的标本中有一颗松树死于雷电击,而其他松树死亡原因还未确定。在多伦多附近的约克地带森林和布罗克维尔附近的利默里克森林中的多脂松 Pinus resinosa Ait 及佩里港附近的一个私人造林园中的多脂松上,发现了松材线虫。在锡姆科附近的 Turkey Point 州
Bursaphelenchus xylophilus (Steiner & Buhrer) Nickle, which is common in the United States. But only in Bethel state of Manitoba in Canada. From July 1984 and from November to February 1985, pine wood specimens that had recently died were collected at four locations in southern Ontario and the presence of the pine wood nematode was examined, with one of the collected specimens Pine died of lightning strikes, while the cause of the death of the other pine trees has not yet been determined. Pine wood nematodes were found on the Yorkshire Forest near Toronto, Pinus resinosa Ait in the Limerick Forest near Brockville, and Pinus pinea in a private afforestation near Perry Harbor. In Turkey Point State near Simco