阿维菌素与印楝油对柑桔红蜘蛛的增效作用

室内测定阿维菌素与印楝油对柑桔红蜘蛛的毒力及其复配组合的联合作用。毒力测定结果表明，阿维菌素与印楝油对柑桔红蜘蛛雌成螨处理后24 h的LC50分别为0.01 μg/mL 和6 579.87 μg/mL。以共毒因子法评价阿维菌素与印楝油6种复配组合的联合作用，结果显示，二者以1 ∶ 100和1 ∶ 125两种比例复配对柑桔红蜘蛛雌成螨的共毒因子分别为24.50和31.08，具增效作用；进一步以共毒系数法确定阿维菌素与印楝油以1 ∶ 125的比例复配增效作用最为显著，共毒系数为160.76。

Synergistic Effect of Abamectin and Neem Oil Against Panonychus citri Me Gregor

Toxicity of abamectin and neem oil against Panonychus citri and the synergistic effect of their mixture were evaluated in the lab.It was showed that,for the contact toxicity of abamectin and neem oil to adult famales of Panonychus citri,the LC50 value was 0.01 μg/mL and 6 579.87 μg/mL,respectively,after 24 h treatment.The optimal mixture ratio of abamectin with neem oil was determined by co-toxicity factor and co-toxicity coefficient method.The results indicated that,among the 6 combinations of theses two active ingredients,the co-toxicity factor of combination at the ratios of 1 ∶ 100 and 1 ∶ 125 for abamectin vs neem oil was 24.50 and 31.08,respectively.Furthermore,combination at the ratio of 1 ∶ 125 showed the highest synergism with a co-toxicity coefficient of 160.76.