瓢虫和杀虫剂对矢尖蚧种群系统的控制作用

CONTROL EFFECTS OF THE LADYBEETLE AND PESTC1DE ON POPULATION SYSTEM OF ARROWHEAD SCALE, UNASPIS YANONENSIS KUWANA

以生命表为基础,应用状态空间分析法,评价了瓢虫和杀虫剂对矢尖蚧种群系统的控制作用。结果表明,在生防区,当瓢虫的数量减半和没有瓢虫的作用时,矢尖蚧第二代的数量将分别为第一代的7.4110和8.9395倍;分别为对照的1.9861和2.3957倍。在农药处理区,用40％氧化乐果喷雾(1:1000)和涂枝(1:2),矢尖蚧第二代的数量将分别为第一代的1.6278和1.5209倍;分别为对照的3.1162和0.4076。

The experiments were conducted during 1986 - 1987 in the citrus groves of Huaxi, Guizh-ou province. The life tables and state-space method were applied to evaluate the control effects of ladybeetle and pesticide on population system of arrowhead scale, Unaspis yan-onensis Kuwana. In the plot of biological control, if the ladybeetles decrease 50% the population size of the 2nd generation of Unaspis yanonensis will be 7.4110 times as that of its 1st generation and 1.9861 times as that of the control, respectiveley; if there is no lady-beetle, the population size of the 2nd generation of Unaspis yanonensis will be 8.9395 times as that of 1st generation and 2.3957 times as that of the control,respectively.In the chemical control plot, on the citrus had been spraying with 40% Omethoate (1:10000) , the population size of the 2nd generation of Unaspis yanonensis was 11.6278 times as that of 1st generation and 3.1162 times as that of the control, respectively, on the citrus smearing the branch with 40% Omethoate (1:2), the population size of 2nd generation of Unaspis yanonensis was 1.5209 time as that of the 1st generation 0.4076 times as that of the control, respectively.