【摘要】 通过研究落叶松叶蜂自然种群存活率、幼虫期的食量、落叶松针叶的重量生长量、叶量损失强度对标准枝(直径0.4～0.8cm)生长量的影响,建立了落叶松叶蜂的防治指标动态模型:并且证明整个幼虫期的取食及消耗的叶量,达落叶松立木针叶蓄积量的44.34％时,为防治指标所允许的叶量损失阈限。更多还原

【Abstract】 Describes the establishment of a dynamic model of control threshold of Pristiphora erichsonii ( Hartig ) based research on survival rate of natural population, larvae diet-quantity, leaf-increment, and related growth of standard branch ( diameter 0.40.8cm ) to leaf losing rate. Leaf losing rate and diet consumed at larvae stage reached 44.34% of total volume of needles were control threshold value for allowble limit of leaf losing.更多还原