增效吡虫啉对豆蚜的室内毒力测定

目的]测定增效吡虫啉对豆蚜的毒力。方法]采用浸渍法测定了2种增效吡虫啉对豆蚜的24 h致死作用,同时以市售的35%吡虫啉悬浮剂为对照。结果]31%增效吡虫啉悬浮剂SE-6-4防治豆蚜的效果最佳,其LC50值为5.2673 mg/L;其次为31%增效吡虫啉悬浮剂SE-1,LC50值为7.7441 mg/L;35%吡虫啉悬浮剂的LC50值为10.5630 mg/L,豆蚜对其的敏感性相对较低。结论]31%增效吡虫啉悬浮剂SE-6-4和SE-1是2个良好的制剂产品,具有减量同效的应用价值,可将其进一步用于田间试验。

Toxicity of Synergistic Imidacloprid to Aphis craccivora Koch

Aims] Toxicity of synergistic imidacloprid to Aphis craccivora Koch was studied.Methods] The 24 h-lethal effect of synergistic imidacloprid were determined by impregnation method,and the commercial imidacloprid 35% sc as control.Results] The results showed that synergistic imidacloprid SE-6-4 31% SC had the highest control efficacy with lc50 of 5.267 3 mg/l,followed by synergistic imidacloprid se-1 31% sc with lc50 of 7.744 1 mg/l.The lc50of imidacloprid 35% sc was 10.563 0 mg/l,and had low toxicity to Aphis craccivora Koch.Conclusions] The control efficacy of low-dose synergistic imidacloprid SE-6-4 and SE-1 31% SC were similar to that of high-dose imidacloprid 35% SC.They were good formulations and could be used in field trials.