纵坑切梢小蠹大发生原因探讨

本文从种群系统出发,全面分析了纵坑切梢小蠹与云南松的相互作用.及环境多种因素对该虫大发生的综合影响.认为在虫害发生初期,云南松树势衰弱是纵坑切梢小蠹大发生的基本条件,当虫害猖獗漫延时,该虫可以攻击并致死健康树.纵坑切梢小蠹种群数量便成为虫害进一步加剧的主要因素.气候、寄主抗性、林地条件、森林管理对害虫种群消长有重要影响.昆明地区气候条件对于纵坑切梢小蠹生长繁殖都非常有利,是该虫得以在短期内爆发成灾的主要原因.

Approach to the Reasons of Tomicus Piniperda (L. ) population Epidemic

Form view of the population system point, the relationship between Tomicus piniperda and Yunnan.pine, and the comprehensive influence of a few factors on the population outbreaking were analysized systematically in this paper. It is suggested that, a number of Yunnan pines declining severely is one of the essential conditions for the pine shoot beetle population to increase strongly before the epidemic. As the pine shoot beetle get into epidemic phase, the pine shoot beetle is able to attack and kill the healthy trees, the populstion size thus become a major factor promoting the greater damage. climate, the host resistsnce, forest conditions and forest management play an important role in the population fluctuating. Especially, the climate in Kunming is quite advantage of the developing and breeding of the pine shoot beetle, so suggested, to be a main reason for the insect epidemics in short term.