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[目的]筛选出几种防治苜蓿叶蝉高效、低毒、低残留的杀虫剂及经济有效的使用剂量。[方法]以噻虫嗪等4种药剂,每药剂3个剂量进行田间药效对比试验。[结果]噻虫嗪、啶虫脒、溴氰菊酯等3种杀虫剂对苜蓿叶蝉初始防效高,持效好。[结论]噻虫嗪田间推荐使用剂量为62.5~83.3 mg/L,啶虫脒田间推荐使用剂量为50~66.7 mg/L,溴氰菊酯田间推荐使用剂量为8.3~12.5 mg/L。
[Objective] The research aimed to screen out several kinds of pesticides with high efficiency, low toxicity and low residue to control alfalfa leafhoppers and its economical and effective dosage. [Method] With thiamethoxam and other 4 kinds of medicaments, each dose of 3 doses of field efficacy comparison test. [Result] The three insecticides, thiamethoxam, acetamiprid and deltamethrin, had good initial control effect on alfalfa leafhopper and had good effect. [Conclusion] The recommended dosage of thiamethoxam was 62.5-83.3 mg / L, the recommended dosage of acetamiprid was 50-66.7 mg / L, and the recommended dosage of deltamethrin was 8.3-12.5 mg / L in the field.