摘要
赤松毛虫(Dendrolimus spectabilis Butler)是山东省松树的主要害虫,常将成片的松树吃光,危害十分严重。目前在治虫工作中,往往只根据经验性“指标”决定防治与否,盲目性很大。因此,研究和提出一个准确有效的防治指标,具有非常重要的意义。我们于1986～1987年在山东省新泰市土门林场,对赤松毛虫防治指标进行了初步研究,现将结果整理报告如下。
By simulated experiments, the Fermital leaf-lost level of 25 % has been determined for 15-20 year-old plantations of Finns densiflora initially attacked by D. spectabilis under the medium site conditions in central-south mountain areas in Shandong Province, and the amount of leaves eaten by caterpillars has been measured to be 40g/head. The regression equation, y = 1275.47x- 5861.72 (r=0.90), has been set up between the volume of needles (y) and the diameter of breast height dbh (x). A control index of D. spectabilis in spring is set to be 11~59 head/tree for plantations with an average dbh of 6~12 cm.
出处
《林业科学研究》
CSCD
北大核心
1990年第3期290-295,共6页
Forest Research
