1 发生历史和现状我省于1988年传入松材线虫病,当时仅在3个县(区)和1个国营林场的局部松林中发生,目前已扩展至11个县(区)和2个国营林业总场(见表)。在发病林分中,既有国有林,又有乡镇集体林;既有用材林,又有森林公园和城市公园风景林。松材线虫病的为害不仅造成大量松树死亡和重大的经济损失,也给自然景观和生态环境造成严重的破坏。1988至1994 1 History and Current Situation The province introduced pine wilt disease in 1988 when it occurred in only part of the pine forests in 3 counties (districts) and 1 state-owned forest farms. It has now been extended to 11 counties (districts) and 2 State Forestry General Field (see table). Among the forest stands, there are both state-owned forests and township-owned collective forests; both existing timber forests, as well as forest parks and scenic parks of urban parks. Pine wood nematode damage not only caused a large number of pine death and major economic losses, but also to the natural landscape and ecological environment caused serious damage. 1988 to 1994