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1987～1991年选用有机磷、有机氮和拟除虫菊酯类十三种杀虫剂对白背飞虱和褐飞虱用国际统一标准毒力测定点滴法进行抗药性监测。结果表明:1)白背飞虱和褐飞虱对呋喃丹最为敏感,对马拉硫磷敏感度最低。LD_(50)值相差上百倍。因两种飞虱均属迁飞性害虫,年度间的测定结果稍有波动。2)白背飞虱抗药性发展比褐飞虱快,在测定方法和供试昆虫条件基本相同的情况下,将1990年所测几种药剂的LD_(50)与日本Nagata(1967)测定数据进行比较,浙江省白背飞虱种群对马拉硫磷的抗性差异高达110.56倍,对杀螟松为48.90倍;褐飞虱种群对马拉硫磷、杀螟松的抗性分别相差11.61倍和6.11倍。3)褐飞虱种群对药剂的敏感度与当地用药水平呈负相关。4)有机磷类不同品种杀虫剂对两种飞虱的毒力差异较大,毒力较高的久效磷的LD_(50)值与毒力较低的马拉硫磷的LD_(50)相差数十倍。
From 1987 to 1991, 13 pesticides such as organophosphorus, organic nitrogen and pyrethroids were used to monitor the drug resistance of whitebacked planthopper and brown planthopper using the standard international standard titration method. The results showed that: 1) White-backed planthopper and brown planthopper were the most sensitive to carbofuran and the lowest susceptible to malathion. LD_ (50) value difference of a hundred times. Due to the two types of planthoppers are migratory pests, the annual measurement results fluctuate slightly. 2) The development of resistance of white-backed planthoppers to BPH was faster than that of BPH. Comparing the measured data of LD 50 with those of Nagata (1967) in Japan in the same method and test insect conditions , Zhejiang Province whitebacked planthopper population resistance to malathion up to 110.56 times, fenitrothion 48.90 times; BPH population on malathion and fenitrothion resistance difference of 11.61 times and 6.11 times . 3) The sensitivity of the Nilaparvata lugens population to the drug is negatively correlated with the level of local drug use. 4) The toxicity of different organic phosphorus insecticides to the two planthoppers was significantly different. The LD 50 value of monocrotophos with higher virulence was lower than that of malathion LD 50 with lower virulence ) A difference of several times.