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在日本,赤松和黑松的大量死亡已经持续了几十年。于1968年开始对松树死亡之原因进行研究,结果在死树的木质部中发现了大量松材线虫Bursaphelenchus xylophilus(Steiner & Bubrar)Nickle。该线虫接种松树证明它有强烈的致病性,另些试验也证实该线虫是引起松树枯萎死亡的病原,详细调查与死树有关的大量昆虫,确定松褐天牛Monochamus alte-
In Japan, the massive deaths of Japanese red pine and black pine have lasted for decades. The cause of the death of pine trees began in 1968 and resulted in the discovery of a large number of Bursaphelenchus xylophilus (Steiner & Bubrar) Nickle in the xylem of the dead tree. The nematode vaccination of pine proved its strong pathogenicity, and other tests also confirmed that the nematode is caused by the withered pine wilt death, a detailed investigation of dead insects and a large number of insects to determine Monochamus alteration Monochamus alte-