西蓝花田桃蚜的室内药剂筛选及田间药效评价

【目的】筛选防治西蓝花田桃蚜的有效药剂。【方法】采用浸虫浸叶法及田间喷雾法进行室内毒力及田间药效试验。【结果】17%氟吡呋喃酮SL对桃蚜最为敏感，而5%高效氯氟氰菊酯ME的敏感性最差，48 h的LC₅₀分别为7.67和1 011.03 mg/L。供试药剂毒力大小低依次为氟吡呋喃酮>氟啶虫胺腈>阿维菌素>双丙环虫酯>噻虫嗪>虫螨腈>藜芦碱>吡虫啉>甲氨基阿维菌素苯甲酸盐>噻虫胺>啶虫脒>溴氰虫酰胺>苦参碱>螺虫乙酯>氟啶虫酰胺>唑虫酰胺>乙基多杀菌素>高效氯氟氰菊酯。5种药剂不同浓度处理对西蓝花桃蚜均具有较好的防治效果。施药后7 d,各处理对西蓝花桃蚜的防效达70.10%～90.11%;药后14 d,各处理对西蓝花桃蚜防效为56.93%～82.55%。【结论】生产中可轮换使用氟啶虫胺腈和氟吡呋喃酮，以保证害虫对药剂的敏感性，减缓害虫的抗药性。

Laboratory Insecticides Screening and Field Efficacy Evaluation against Myzus persicae on Broccoli Field

【Objective】 To screen the effective insecticides against Myzus persicae on Broccoli field.【Methods】 The toxicity bioassay and field efficacy tests were carried out by dipping method and spraying. 【Results】 The laboratory toxicity test results showed that the LC₅₀ of flupyradifurone had the highest toxicity, which was 7.67 mg/L at 48 h. The LC₅₀ of ambda-cyhalothrin showed the lowest toxicity, which was 1,011.03 mg/L at 48 h. The order of the toxicity of the eighteen insecticides from high to low was as follows: flupyradifurone﹥ sulfoxaflor ﹥ abamectin ﹥ciprofloxacin﹥ thiamethoxam ﹥chlorfenapyr﹥ veratrine﹥ imidacloprid ﹥emamectinbencoate ﹥ clothianidin ﹥acetamiprid ﹥cyantraniliprole﹥ matrine ﹥spirotetramat ﹥flonicamid﹥ tolfenpyrad ﹥spinetoram﹥ ambda-cyhalothrin. Five highly toxicity insecticides were selected for field trials on this basis. The results showed that treatment of five kinds of insecticides at different concentrations had a higher control effect on Myzus persicae. The field control efficacies of five kinds of insecticides were 70.10% 90.11% after seven days of application; The field control efficacies of five kinds insecticides were 56.93% 82.55% after fourteen days of application. 【Conclusion】 Therefore, it was suggested sulfoxaflor and flupyradifurone should be used in the production to ensure the sensitivity of pests to insecticides so as to delay the resistance of pests.