4种化学药剂对红火蚁的室内毒力测定

Indoor Toxicity Determination of Four Chemical Agents Against Solenopsis invicta

【目的】筛选对红火蚁(Solenopsis invicta Buren)防治药效好且致死率高的药剂,为红火蚁的科学防控提供理论依据。【方法】通过室内毒力测定,研究4种化学药剂(40%呋虫胺、10%多杀霉素、15%茚虫威和70%吡虫啉)对红火蚁的毒杀效果,分析时间、剂量和死亡率之间的关系。【结果】4种化学药剂对红火蚁工蚁的毒杀作用随时间变化呈升高趋势,随浓度下降呈降低趋势,其中,40%呋虫胺在各稀释倍数下对红火蚁均具有较强的毒杀效果,其对红火蚁的致死率大部分显著高于其余药剂。室内毒力测定显示,4种化学药剂的毒力大小排序为40%呋虫胺>10%多杀霉素>15%茚虫威>70%吡虫咻,其LC_(50)值分别为2.652 mg/L、25.987 mg/L、33.980 mg/L和358.474 mg/L。40%呋虫胺、70%吡虫啉、10%多杀霉素在工蚁致死作用最强的时间段为喷施药剂后3~12 h。【结论】40%呋虫胺对红火蚁具有较高毒力,在红火蚁防治中具有较高的开发利用潜力。

【Objective】The pesticides that has good control efficacy and high lethality towards Solenopsis invicta were screened to provide theoretical basis for the scientific prevention and control of S.invicta.【Method】The toxicity of four chemical pesticides(40% dinotefuran,10% spinosad,15% indoxacarb and 70% imidacloprid) on S.invicta was determined by indoor toxicity testing,and the relationship among time,dose and mortality was analyzed.【Result】The toxic effects of the four chemical pesticides on S.invicta workers increased with time and decreased with concentration decreasing.Among them,40% dinotefuran showed strong toxic effects on S.invicta at various dilution levels,and its mortality rate was significantly higher than the other pesticides.The indoor toxicity determination revealed that the toxicity ranking of four chemical pesticides was 40% dinotefuran >10% spinosad >15% indoxacarb >70% imidacloprid,with LC_(50) values of 2.652 mg/L,25.987 mg/L,33.980 mg/L and 358.474 mg/L,respectively.The strongest period for the mortality effects of 40% dinotefuran,70% imidacloprid and 10% spinosad on S.invicta workers were 3 to 12 hours after applying pesticides.【Conclusion】40% dinotefuran has high toxicity against S.invicta and has great potential of development and utilization in control of S.invicta.