双条杉天牛(Somanotus bifasciatus)是杉树的大敌。我场1966年开始发现其危害,但危害程度较轻,未引起重视。目前已发展到90%的林地受到不同程度的危害。据调查,最严重的横坑工区红椎木对面的林地,杉木被害率达78%;直属队苗圃地对面林地,杉木被害率64%;其余林地的杉木被害率也在31%以上。杉木被害后,影响高粗生长,易风折,甚至 Somanotus bifasciatus is the enemy of cedar trees. My field began to find its harm in 1966, but less harmful, did not pay attention. At present, 90% of the forest land has been harmed to varying degrees. According to the survey, the worst Hokeng area Redwood across the woodland, fir damage rate of 78%; directly under the team nursery opposite the woodland, fir damage rate of 64%; the rest of the woodland fir damage rate is also above 31%. After the fir was killed, the impact of high coarse growth, easy to wind fold, or even