松材线虫病是我国松树的一种毁灭性病害，其发生特点大致如下：一是病源都是外源性的，而媒介昆虫为土生土长的。即松材线虫首先从国外 (日本、美国 )或境外 (台湾、香港 )传入，在国内扩散蔓延都是在病虫增殖的基础上，因病死木外流所致。二是传播迅速。该病害自1982年在江苏 Pine wood nematode disease is a devastating disease of pine in China, its occurrence characteristics are as follows: First, the pathogen is exogenous, and the vector insects are native. Pine wood nematodes were first introduced from abroad (Japan and the United States) or from overseas (Taiwan and Hong Kong). The proliferation and spread in China were all caused by the outflow of dead wood on the basis of the multiplication of pests and diseases. Second, spread rapidly. The disease since 1982 in Jiangsu