摘要
杨毒蛾(Leucoma candida S.)和柳毒蛾(L. salicis L.)是杨树主要的食叶害虫之一。为有效治理该害虫,我们从1984—1987年对杨、柳毒蛾为害杨树的经济阈值,防治指标进行了系统的研究。通过人工模拟摘叶、接虫试验及实际为害损失结果指出,不同林分被害经济阈值不同,存未郁闭林中,胸径年生长量1.5cm以下及2cm以上的人工林,失叶量分别为30％和15％达到为害的经济阈值。在郁闭林分中失叶量25％达到经济阈值。通过饲养了解,平均每头杨毒蛾幼虫一生食叶量为5.3g,柳毒蛾为4.5g。然后采用经验公式计算各林分防治指标。
The Leucorna candida and L salicis are one of the major leaf-eating pest insects of poplar, to control the pest insects effectively. We studied their economic injury Fevel (EIF) and management index. The results obtained areas follows: Through observation of artificial dofoliation, under canopied forest, in the case of annual diameter increment is from 1.5cm to 2.0 cm, The amount of defoliation of 30% and 25% reach the EIL. On the contrary, the amount of defoliation of 25% reach the ElL. The average amount of leaves eaten by a single L. candida and L. salicis was 5.3g, 4.5g, respectively. Then, use the empinical formula to calculate the control index.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1989年第2期12-19,共8页
Journal of Northeast Forestry University
关键词
杨毒蛾
柳毒蛾
防治
指标
Leucoma candida
Leucoma salicis
Preventive treatment
Index
