【作者】 田明义； 庞雄飞； 梁广文；

【Author】 Ming-yi Tian Xiong-fei Pang Guang-wen Liang (Laboratory of Insect Ecology,South China Agricultural University,Guangzhou 510642)

【机构】 华南农业大学昆虫生态研究室；

【摘要】 对贵州省清镇柑园桔全爪螨自然种群生命表的分析结果表明:种群趋势指数I=5.1794,说明下代种群数量将上升5倍;捕食性天敌(主要有食螨瓢虫,食螨隐翅鱼和捕食螨等)是影响桔全爪螨种群数量发展趋势的重要因子,捕食性天敌的控制指数(IPC值)为17.4368,即如果没有天敌的作用,该螨种群数量将上升17倍。更多还原

【Abstract】 In this paper,the establishment and analysis of the life table for the natural population of the citrus red mite(Panonychus cirri McG.) in citrus orchards in Guizhou Province were discussed.Based on the data of systematic investigation in the orchards,the initial numbers and matalities of every stages(egg,larva,nymph and adult) and every active factor were estimated respectively.By combining with the reproduction parameters(i.e.sexual ratio,F,and Fb) gained from the laboratory,the life table was established.The analysis of the life table showed that:(1) the I-value is 5.1794,the population of the next generation of the mite would be 5 times as that of the present generation;(2) the important factor which affected the I-value was the action of natural enemies(including Stethorus spp.,Quasimus sp.,Amblyseius nichosi Ehara and Agistemus sterminalis etc.).The total IPC of predators was 17.4368,it means that,without the action of the predators in the orchards,the I-value would increase as more as 17 times.更多还原