论文部分内容阅读
为探讨蚜虫报警信息素反-β-法尼烯(E-β-farnesene,EβF)对菜蚜的控制作用,用地统计学方法分析了大白菜田释放EβF后,菜蚜及其主要天敌瓢虫的空间分布格局的变化。不同调查时期菜蚜种群半方差函数拟合模型表明,菜蚜在EβF释放田和对照田均呈聚集分布。释放EβF 42 d后,对照田菜蚜种群高密度聚集区在对照田中部出现,而EβF释放田在距离中心释放点约6 m范围内没有菜蚜种群高密度聚集区出现。在对照田和EβF释放田,瓢虫在空间范围和数量上均表现出对菜蚜的跟随作用,在EβF释放田离释放点5~6 m范围内瓢虫出现的频率高。说明EβF释放后尽管不能改变菜蚜的聚集分布模式,但可以通过吸引天敌瓢虫来抑制6 m范围内菜蚜的种群增长。
In order to investigate the control effect of E-β-farnesene (EβF) on aphid in the cabbage field, aphid analysis was carried out by using geostatistics method. After the EβF was released from the Chinese cabbage field, The spatial distribution pattern changes. The semivariance fitting model of aphids in different periods showed that the aphids distributed in EβF releasing field and control field. After the release of EβF for 42 d, the high-density accumulation zone of the control Aphis gossypii appeared in the middle part of the control field, whereas the EβF release field appeared in the high-density accumulation zone of the aphid population within about 6 m from the central point of release. In the control field and EβF release field, the ladybug showed the following effect on the vegetable aphid in space and quantity, and the frequency of ladybug appeared within 5 ~ 6 m from the release site of EβF. The results showed that although the pattern of aggregation and distribution of aphids could not be changed after the release of EβF, the population growth of aphids in the 6-m range could be suppressed by attracting the ladybugs.