云杉梢斑螟发生与云杉林分结构关系的研究

Study on the Relationship Between the Occurrences of Dioryctria Schuezeella and Spruce Forest Stand

云杉梢斑螟是云杉林最主要的害虫之一,文章对肃南裕固族自治县云杉梢斑螟的发生与林分结构的关系进行了调查。结果显示,林分的郁闭度越低,云杉梢斑螟的虫口密度和有虫枝率越高,其危害越严重,中龄林平均虫口密度最大,纯林中云杉梢斑螟发生比混交林发生严重。

Dioryctria Schuezeella is one of the major pests in spruce forest. The relationship between its occurrence and stand structure was investigated in Sunan Yugur Autonomous County. The results showed that the lower the canopy density, the higher the pest density and the rate of insect branches of Dioryctria Schuezeella, and the more serious the damage was. The biggest average insect density was in the middle-age forest, and the occurrence of Dioryctria Schuezeella in pure forest was more serious than that in mixed forest.