论文部分内容阅读
田间试验研究了连晚前期施药种类和时间对褐飞虱种群动态的影响。结果表明施药后褐飞虱种群数量均有不同程度下降，但对褐飞虱主害代的控制作用与使用的农药种类和时间有密切的关系，而农药对褐飞虱的控制作用随种群的发展而下降。施药区褐飞虱种群增长倍数较对照区显著提高，其主要原因是农药对天敌尤其是对微蛛和黑肩绿盲蝽的杀伤作用。引起褐飞虱种群增长倍数提高的主要时期在四代成、若虫高峰期至五代卵高峰期，即施药后２～３周内。在各种供试药剂中，施用三唑磷的小区明显出现再增猖獗现象．根据以上结果，讨论了改善褐飞虱化学防治的途径。
Field experiments were conducted to study the effects of the type and timing of even late prophase application on the population dynamics of BPH. The results showed that the populations of BPPH all decreased to different extents, but the controlling effects on BPH were closely related to the type and time of pesticides used. However, the control effect of pesticides on BPH decreased with the population development. The multiplication rate of BPH population in the application area was significantly higher than that in the control area, mainly due to the killing effect of pesticides on the natural enemies, especially the micro-spider and Apodemus agrarius. The main period of increasing population multiplication of BPH population was in four generations, and the nymphs peaked to the peak of fifth generation eggs, that is, within 2-3 weeks after application. In a variety of test agents, triazophos community apparently re-rampant phenomenon. Based on the above results, the ways to improve the chemical control of BPH were discussed.