论文部分内容阅读
从1980年至1985年,在广州市郊的柑桔园研究了柑桔潜叶蛾[Phyllocnistis citrella(Staint.)]自然种群生命表。用Manly的关键因子分析法对五个同次世代的生命表材料进行分析,结果表明,影响关键世代种群变动的关键因子是一龄幼虫自然死亡和二龄幼虫捕食。各发育阶段的天敌因子对关键世代种群变动的影响力达64.6％。据此制定了保护天敌的防治策略,经实践证明,采用此措施可推迟下一代峰期的出现时间,有利于柑桔秋梢在最合适的时间抽放。
From 1980 to 1985, the natural population life table of Phyllocnistis citrella (Staint.) Was studied at citrus orchards in the suburbs of Guangzhou. Manly’s key factor analysis was used to analyze the life-table materials of the same generation. The results showed that the key factors affecting the population changes in the key generation were the natural death of the first instar larvae and the predation by the second instar larvae. The effect of natural enemies at each developmental stage on the population changes of key generations was 64.6%. Accordingly, the prevention and control strategy for the protection of natural enemies has been formulated. Proved by practice, the adoption of this measure can delay the appearance time of the next generation of peak periods and is conducive to the drainage of citrus autumn shoots at the most suitable time.