【摘要】 通过分析用药后低龄若虫、高龄若虫和成虫的数量消长情况,对毒死蜱和噻嗪酮2种药剂防治褐飞虱的效果进行了研究。结果表明,使用这2种杀虫剂后,虽然田间褐飞虱卵能持续孵化,从而使总体防效降低,但这2种药剂均能有效减少高龄若虫数量,其中噻嗪酮在长达1个多月的时间内能阻止褐飞虱由低龄向高龄转化,毒死蜱的抑制有效期大约为10d。这2种药剂主要是通过在稻株上的残留来杀死低龄若虫,从而发挥其药效作用。通过本研究,有助于正确评价药剂对褐飞虱的防效,从而为防治决策提供可靠依据。更多还原

【Abstract】 By analyzing dynamic in quantity on low instar nymphs,high instar nymphs and adults,control effects of chlorpyrifos and imidacloprid on brown planthopper were studied.The results showed that most eggs of brown planthopper could incessantly hatch after applying the two insecticides thereby lowering the control effects.However,both the insecticides could effectively reduce the number of high instar nymphs and among them,imidacloprid could restrain brown planthopper from developing to high instar from low instar for more than 30 days and restraining period of chlorpyrifos was about 10 days.The two insecticides took effect by killing low instar nymphs with their residue left on rice plants.This study could help to evaluate the control effects of insecticides on brown planthopper correctly and consequently providing credibility basis for control decision-making.更多还原