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松材线虫(Bursaphelenchus xyl-ophiIus)萎蔫病主要发生在日本、美国、法国、朝鲜及我国台湾。它是日本森林的一种特大病害,受害最重的1979年损失松材达240万立方米。我国大陆在1983年才在南京郊区首次发现。这种线虫病不仅为害性大,蔓延也快。据南京市农林局资料,1983年南京因此而枯死的松树不过200多株,到1986年竟达10万株以上。松材线虫在日本主要为害日本赤松、
Bursaphelenchus xyl-ophiIus wilting mainly occurs in Japan, the United States, France, North Korea and Taiwan in China. It was a particularly serious disease in Japanese forests. In 1979, the hardest hit was the loss of 2.4 million cubic meters of pine wood. The mainland of China was first discovered in the suburbs of Nanjing in 1983. This nematode disease is not only harmful, rapid spread. According to the data from Nanjing Agriculture and Forestry Bureau, the number of pine trees that died in Nanjing in 1983 was only over 200, reaching over 100,000 in 1986. Bursaphelenchus japonicus in Japan mainly harmful Japanese red pine,