（江苏省农业科学院植物保护研究所南京210014）摘要为高效和合理利用化学药剂防治褐飞虱Nilaparvata lugens (Stl)，采用浸苗法和喷雾法测定了噻虫嗪、烯啶虫胺、甲氨基阿维菌素苯甲酸盐、氯噻啉和乙虫腈5种药剂对褐飞虱的作用活性和速度，同时还比较了噻虫嗪和烯啶虫胺对褐飞虱不同龄期若虫的作用活性。结果表明，在5种供试药剂中，从作用活性来看，无论是用浸苗法还是喷雾法处理，烯啶虫胺活性均最高，对褐飞虱3龄若虫的LC50分别为041和026 mg/L，氯噻啉的活性则最低。甲氨基阿维菌素苯甲酸盐、氯噻啉和噻虫嗪用喷雾法处理时的活性均显著高于用浸苗法处理时的活性；烯啶虫胺和乙虫腈在2种处理方式下的活性没有明显差异。从作用速度来看，喷雾法处理时，甲氨基阿维菌素苯甲酸盐、乙虫腈和氯噻啉杀虫速度均快于烯啶虫胺和噻虫嗪。噻虫嗪和烯啶虫胺对褐飞虱各个龄期若虫都表现出较理想的活性，对5龄若虫的LC50值分别是1龄若虫的74和97倍。
关键词褐飞虱， 烯啶虫胺， 噻虫嗪， 杀虫活性， 杀虫速度

Comparison of the effectiveness of different insecticides against
Nilaparvata lugens GUO HuiFang**FANG JiChaoLIU BaoShengWANG LiHua
(Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing210014, China )

AbstractThe effectiveness of different insecticides, including thiamethoxam, nitenpyram, methylaminoavermectin, imidaclothiz and ethiprole, against the brown planthopper, Nilaparvata lugens (Stl), was investigated. Lethal concentration and time were determined after seedlingdipping and spraying treatments. Based on dosemortality responses, nitenpyram showed the highest insecticidical activity against 3rd instar nymphs of all the insecticides tested with LC50 values for seedlingdipping and spray treatments of 0.41 mg/L and 0.26 mg/L, respectively. Imidaclothiz was the least effective insecticide tested. Differences in the performance of the same insecticides between seedlingdipping and spraying treatments were found in methylaminoavermectin, imidaclothiz and thiamethoxam. The killing speed of sprayed methylaminoavermectin, ethiprole and imidaclothiz was significantly higher than that of thiamethoxam and nitenpyram.All instars of the brown planthopper were sensitive to thiamethoxam and nitenpyram, the insecticidical activity ratio of the LC50s of 1st and 5th instar nymphs were 7.4 and 9.7, respectively.
Key wordsNilaparvata lugens, nitenpyram, thiamethoxam, insecticidal activity, killing speed