摘要
本文对杨十斑吉丁虫(Melanophila decastigma Fabricius)损失量和防治对策进行了探讨。根据虫口密度和危害后所造成的材损率大小和树高、胸径生长量的影响程度,将危害情况以株均虫口密度分为五个水平的防治指标:0级(2头/株以下);Ⅰ级(3～lO头/株);Ⅱ级(11～20头/株),Ⅲ级(21～30头/株);Ⅳ级(30头/株以上)。针对不同危害情况提出了相应的控制危害的防治策略和方法。
This paper is concerned with the loss caused by melanophila decastigma fabricius and the measures for its control. Based on the influence on timber loss rate, tree height and diameter breasthigh, the larva density was divided into five classes 0: less than 2/ind Ⅰ: 3～10/ind Ⅱ: 11～20/ind Ⅲ: 21～30/ind Ⅳ: over 30/ind The prevention tactics and different control methods Were taken in the light of the harm of this insect.
出处
《甘肃农业大学学报》
CAS
CSCD
1991年第4期402-408,共7页
Journal of Gansu Agricultural University
关键词
杨十斑吉丁虫
危害
损失
防治
melaophila decastigma fabricius
loss quantities
grade of harmfulness
timber lss rate
