摘要
研究印楝素和银杏酚酸复配对甜菜夜蛾幼虫的协同增效作用,为开发植物源农药提供理论依据。用印楝素和银杏酚酸及其复配混剂对甜菜夜蛾2龄幼虫进行室内毒力和拒食活性测定,筛选对甜菜夜蛾高效低毒的药剂。结果表明,印楝素和银杏酚酸复配质量比为6∶2,对甜菜夜蛾2龄幼虫具有明显的协同增效作用,2d后的致死中质量浓度(LC_(50))为20.31mg/L,共毒系数为295.36;当印楝素和银杏酚酸复配质量比为3∶5时,拒食活性测定共毒系数为225.22,AFC_(50)为27.03mg/L,增效作用最强。
The research aimed to determine the common-toxicity of the mixture of azadirachtin and ginkgolic acids and provide theoretical basis for developing natural pesticides.The toxicity and antifeeding of azadirachtin and ginkgolic acids and their admixture against the 2nd-instar larvae of Spodoptera exigua(Hübner)were conducted in laboratory.The results showed that azadirachtin and ginkgolic acids enhanced their toxicity with each other.The results showed that a mass ratio 6∶2 mixture of azadirachtin and ginkgolic acids was the most synergetic stomach poison with a co-toxicity coefficient of 295.36 two days later.Under this condition,the admixture had the most synergistic effect.The LC_(50) was 20.31 mg/L for up to 2d.The admixture produced amaximum anti-feeding effect and the AFC_(50) was 27.03mg/L when the admixture was blended with ginkgolic acids and azadirachtin at the mass ratio of 3∶5,and the most synergetic effect was detected with a co-toxicity coefficient of 225.22.
引文
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