5种杀虫剂对小麦蚜虫的毒力测定及田间药效试验

Toxicities and Field Trials of 5 Insecticides to Wheat Aphids

[目的]筛选出防治小麦蚜虫的药剂。[方法]采用玻片浸渍法和喷雾法测定5种药剂对麦蚜的毒力和田间防效。[结果]10%氯氰菊酯EC、10%吡虫啉WP、3.6%烟碱·苦参碱CS、22%氟啶虫胺腈SC和25%噻虫嗪SG对麦长管蚜的LC50值分别为30.34、19.30、3.93、11.22、21.63 mg/L。田间药效试验表明：25%噻虫嗪SG和10%吡虫啉WP速效性好,药后1 d的防效均大于80%;22%氟啶虫胺腈SC、25%噻虫嗪SG和3.6%烟碱·苦参碱CS持效性好,药后7 d的防效达87.6%～92.8%。[结论]3.6%烟碱·苦参碱CS、22%氟啶虫胺腈SC、25%噻虫嗪SG和10%吡虫啉WP可用于防治小麦蚜虫。

[Aims] The study aims to screen out suitable insecticides to control wheat aphides. [Methods] Toxicities and field efficacy of 5 insecticides were determined by slide dip method and foliar spray, respectively. [Results] LCso Values of cypermethrin 10% EC, imidacloprid 10% WP, nicotine .matrine 3.6% CS, sulfoxaflor 22% SC and thiamethoxam 25% SG to Sitobion avenae were 30.34, 19.30, 3.93, 11.22 and 21.63 mg/L, respectively. The control of thiamethoxam 25% SG and imidacloprid 10% WP against wheat aphid were more than 80% after 1 d after treatment, showing good readily availability. The control of sulfoxaflor 22% SC, thiamethoxam 25% SG and nicotine .matrine 3.6% EC were 87.6-92.8% after 7 d after treatment, showing long persistence effect. [Conclusions] Nicotine -matrine 3.6% EC, sulfoxaflor 22% SC, thiamethoxam 25% SG and imidacloprid 10% WP can be used to control wheat aphids.