湿地松粉蚧夏季数量凋落的原因分析

利用生命表技术及其相应的控制指数分析方法，对新侵入害虫湿地松粉蚧Ｏｒａｏｅｌｌａａ－ｃｕｔａ（Ｌｏｂｄｅｌｌ）夏季数量凋落的某些因子进行了量化分析。结果表明：在广东南部的新侵入区，夏季高温引起的松梢迅速老化，上代为害以后引起的营养质量的变化、拥挤以及煤污病的严重发生等，均对湿地松粉蚧夏季种群数量的凋落有着明显的影响，其总的排除作用控制指数ＥＩＰＣ为４６．８９，如果排除这几个因子的作用，下代种群的数量将为当代的４６．８９倍。

A Analysis of the Causes of Oracella acuta Population Decreases in Summer

By means of the life table techniques and its analysis methods, some factors affectingon Oracella acuta loblloly pine mealybug population decrease in Summer were quantified.The re-sults showed that the factors influencing the natural population decreases of O.acuta were pineshoots cuticularizing,fecundity decrease caused by nutrient and previous generation damage etal.the total EIPC was 46.89 which indicate that the next population will increase 46.89 timesif the factors were excluded.