噻虫嗪等杀虫剂对紫花苜蓿叶蝉田间药效分析

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。

Evaluation on the Field Control Effects of Some Pesticides Such as Thiamethoxam for Control of Leafhoppers on Alfalfa

Several pesticides?and their effective and economic dosages were screened?out with highly efficiency,low toxicity and?low residue to control leafhoppers on alfalfa.Methods] the contrast tests among four pesticides such as thiamethoxam were carried out with three doses per pesticide.Results] The?field trial results showed that three pesticides thiamethoxam,acetamiprid and deltarmethrin exhibited sustainable and highly efficiency against leafhoppers on alfalfa.Conclusions] The recommended usage in fields of thiamethoxam was 62.5-83.3 mg/L,acetamiprid was 50-66.7 mg/L and deltarmethrin was 8.3-12.5 mg/L.