摘要
通过研究榆童锤角叶蜂幼虫期的食量 ,叶量损失对直径 0 .4～ 0 .6 cm、长 50 cm标准枝生长量的影响 ,建立标准枝叶损失率与标准枝生长量损失率的关系曲线 ,分析确定出明显影响标准枝材积生长量的叶损失临界值 ,即叶损失率达 45%时 ,为防治指标所允许的叶损失阈值。
Through studying the appetite of Agenocimbex elmina Worm and the influence of leaves lose of standard branch growth (Diameter:0.4～0.6 cm,Lingth:50 cm),establishing the relationship line between standard branch leave lose and standard branch growth lose,this article analyses and decides that forty five percent of the leave lose is the permitted preventing number.
出处
《甘肃林业科技》
2001年第4期16-18,共3页
Journal of Gansu Forestry Science and Technology
