摘要
本文描述了疣纹蝙蝠蛾的生物学特性,通过对水曲柳解析木分析,研究了该虫的危害对水曲柳材积、树高和胸径的影响,以此确定了防治值。经统计,该虫幼虫为6龄,各虫期的 T 与 V 之间的一元回归方程为:卵期 T=7.65+126.47V;幼虫越冬前期 T=13.77+641.51V;幼虫越冬后期 T=17.38+84.95V;蛹期 T=17.57+91.53V。
This paper concerns that the biological characteristics of Phassus excrescens and effect of injourous insect on volume,hight growth and diameter growth through analytic sample tree of Fraxinus mandshurica,control threshold is es- tiblished according to the effect.The value is that there is the insect rate 1.9%.
出处
《林业科技》
北大核心
1997年第2期22-24,共3页
Forestry Science & Technology
关键词
疣纹蝙蝠蛾
预测
防治阈值
Phassus excrescens
Forecast
Control threshold
