前言松干害虫被害的扩展近十年来,松树枯死现象有不断增大的倾向,其标志是松林被害面积在扩大。而且,凡是侵入松材线虫(Bursaphelechus liqniclus)的松林均引起松树枯死。据报道有下列地区相继发生被害:茨城县(1971年确认)、琦玉县(1974)、宫城县(1975)福岛县(1976)、新泻县(1977)、群马县(1978)、山梨县(1978)、岩手县(1979)及山形县(1979)等。而且, Preface The expansion of the victims of pine and dried pests The phenomenon of dying pine has been on the increase for nearly a decade. The sign of this is that the area damaged by pine forests is expanding. Moreover, all pine forests that invade Bursaphelechus liqniclus cause pine trees to die. It has been reported that one after another killed in the following areas: Ibaraki Prefecture (confirmed in 1971), Saitama Prefecture (1974), Miyagi Prefecture (1975) Fukushima Prefecture (1976), Niigata Prefecture (1977), Gunma Prefecture , Yamanashi Prefecture (1978), Iwate Prefecture (1979) and Yamagata Prefecture (1979). and,