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本文以田间试验数据全面反映不同时间施用甲胺磷＋溴氰菊酯对褐飞虱及其捕食性天敌蜘蛛、黑肩绿盲蝽等种群动态的影响。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时间有密切关系，且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，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。其主要原因是甲胺磷＋溴氰菊酯对捕食性天敌尤其是对黑肩绿盲蝽的杀伤作用。因此建议限制甚至禁止在水稻田单独或混合使用这两种农药。
In this paper, the field test data comprehensively reflect the effects of applying methamidophos and deltamethrin on the population dynamics of the BPH and its predatory natural enemies Spider and Apodemus agrarius at different times. The results showed that the population of BPH population declined to different extents, but the controlling effect on the BPH population was closely related to the duration of use, and decreased with the population development. The population growth of BPH population was significantly higher than that of the control area. The main period of increasing population multiplication of BPH population was from the fourth generation to the fifth generation egg peak, which was 2 to 3 weeks after application. The main reason is the killing effect of methamidophos + deltamethrin on predatory natural enemies, especially against Apodemus agrarius. Therefore, it is recommended to restrict or even prohibit the use of these two kinds of pesticides alone or in combination in paddy fields.