松材线虫 Bursaphelenchus xylophilus 所致的松材线虫病是一种危险性流行病。该病最早报道于1905年在日本九州岛的长崎发生。此后,病害逐渐扩展到九州、四国和本州的广大地区,给日本林业带来重大损失。仅1979年,木材损失多达240万立方米。目前,在日本除最北的北海道岛和木州岛的青森县外其它各地均有发生。其它如美国、法国、联邦德国、意大利、朝鲜和香港等国家或地区也有该病发生的报道。我国于1982年在南京中山陵的黑松 Pi-nus thunbergii 上发生松材线虫病。近几年 Pine wood nematode caused by Bursaphelenchus xylophilus is a dangerous epidemic. The disease was first reported in 1905 in Nagasaki, Kyushu, Japan. Since then, the disease has gradually expanded to vast areas of Kyushu, Shikoku and Honshu, causing heavy losses to Japanese forestry. In 1979 alone, wood lost as much as 2.4 million cubic meters. At present, it occurs in all parts of Japan except Aomori Prefecture, the northernmost island of Hokkaido and the island of Muju. Others such as the United States, France, the Federal Republic of Germany, Italy, North Korea and Hong Kong and other countries or regions also reported the disease. In 1982, pine wilt disease occurred on Pi-nus thunbergii in Pinus sylvestris in Nanjing’s Zhongshan Mausoleum. recent years