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杭州有松林30万hm2，自50年代以来，连续遭受马尾松毛虫、日本松干蚧和松材线虫病的危害，本文对其发生原因和对策作了探讨。
Hangzhou has pine 300000 hm2, since the 1950s, suffered continuous dendrolimus punctatus, Japanese pine scale and pine wilt disease, the paper on its causes and countermeasures were discussed.