祥云新松叶蜂种群动态研究

Study on Population Dynamics of Neodiprion xiangyunensis

１９９２～１９９５年对祥云新松叶蜂的种群动态进行了研究，结果分析表明，影响种群动态的主导因子是茧期死亡率，茧期死亡主要由天敌引起。由于祥云新松叶蜂幼虫具有驱赶天敌的利己激素，捕食性天敌昆虫对幼虫不能产生明显的控制作用。影响幼虫期死亡率的主要因子是温度。通常死亡率低海拔大于高海拔，同一海拔阴坡大于阳坡。由于祥云新松叶蜂危害云南松老叶，且对天敌抵抗力强。

Studies in 1992～1995 show that the key factor influencing the population dynamics of Neodiprion xiangyunensis is its mortality in pupal stage,i.e.the function of natural enemies. The larvae can give off a substance called “altruism hormone” to prevent themselves from preying by predators,so there is scarcely any influence of predation on its population. The main factor influence the motality of larvae is temperature. Usually the higher the altitude,the higher the mortality,but when at the same altitude,the motality in sunny orientation is greater than that in shady orientation. Due to its feeding habits and high resistance to the natural enemies,the pest can cause great damages within several years once occurred.