论文部分内容阅读
本研究应用昆虫生命表及种群趋势控制指数方法,探讨几种药剂对揭稻虱种群数量的控制作。同时研究这几种药剂对稻田天敌密度的作用,并通过杀虫剂的毒力测定,验证主要的两种天敌对几种杀虫剂的反应。 试验结果表明:喹硫磷由于严重杀伤稻田天敌,因而增大了下代的种群趋势,控制指数(14.36)甚低于对照区(28.43)。叶蝉散区的控制指数(29.40)仅略高于对照区,在天敌作用比较明显的环境下(对照区的种群趋势指数为1.8793),防治效果不明显。优乐得(App-laud)区的控制指数最高(65.96),种群趋势指数最低(0.7523),这种药剂属于主要对同翅目昆虫起作用的生长调节剂,不但抑制褐稻虱的种群数量,同时也相对地助长其天敌的作用,因而防治效果较好。 在昆虫生命表的基础上,通过种群趋势控制指数的分析,有助于杀虫剂和天敌协调作用的综合评价。
In this study, insect life table and population trend control index method to explore the number of pesticides on the amount of pest control planthopper made. At the same time, the effects of these agents on the density of natural enemies in paddy fields were also studied. The toxicity of the two main natural enemies to several insecticides was also verified by the toxicity determination of insecticides. The results showed that the population of quetiapine increased the next generation population due to the serious killing of natural enemies in paddy fields. The control index (14.36) was much lower than that of the control (28.43). The control index (29.40) of the leafhopper area was only slightly higher than that of the control area. In the environment with obvious natural enemies (the population trend index in the control area was 1.8793), the control effect was not obvious. The highest control index (65.96) and the lowest population trend index (0.7523) were found in App-laud area, which belongs to the growth regulator mainly acting on Homoptera insects and not only inhibited the populations of the brown planthopper, But also relatively contribute to the role of its natural enemies, so the prevention and treatment effect is better. Based on the Insect Life Table, the analysis of the trend control index helps to make a comprehensive assessment of the coordinating role of insecticides and natural enemies.