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[目的]筛选防治斜纹夜蛾的高效药剂,为其防治提供可靠的技术支撑。[方法]采用浸虫和浸叶饲喂的方法,测定10种药剂对重庆巫山甘薯田斜纹夜蛾种群的触杀和胃毒毒力,并筛选高效复配药剂组合。[结果]对斜纹夜蛾具有高效触杀和胃毒作用的药剂有乙基多杀菌素、溴氰虫酰胺、甲氨基阿维菌素苯甲酸盐,其触杀毒力的LC50值分别为2.6540、3.1166、6.9146 mg/L,胃毒毒力的LC50值分别为6.7751、2.9687、0.3668 mg/L。氯虫苯甲酰胺对斜纹夜蛾幼虫胃毒毒力较好,LC50值分别为1.6658 mg/L,但触杀毒力稍差。毒死蜱与氯虫苯甲酰胺或甲氨基阿维菌素苯甲酸盐配比在质量比(1~14)∶1范围,均有不同程度的增效作用,其中以4∶1配比增效作用最高。[结论]乙基多杀菌素、溴氰虫酰胺、甲氨基阿维菌素苯甲酸盐对斜纹夜蛾具有高效的触杀和胃毒作用,毒死蜱与氯虫苯甲酰胺或甲氨基阿维菌素苯甲酸盐以4∶1配比防治斜纹夜蛾增效作用最强。
[Objective] The study aimed to screen efficient agents for controlling Spodoptera litura and provide reliable technical support for its prevention and treatment. [Method] With the methods of immersion and immersion leaf feeding, the contact toxicity and stomach toxicity of 10 agents on the population of Spodoptera litura in Wushan, Chongqing were determined and the combination of high efficiency compounding agents was screened. [Result] The spikedatives and stomach poisoning agents against Spodoptera litura had ethyl spinosad, bromothiramide and emamectin benzoate, and the LC50 values of their contact toxicity were 2.6540, 3.1166 and 6.9146 mg / L respectively. The LC50 values of gastric toxicity were 6.7751, 2.9687 and 0.3668 mg / L, respectively. Chlorantraniliprolein larvae of Spodoptera litura stomach poisoning toxicity, LC50 values were 1.6658 mg / L, but the contact toxicity slightly less. The ratios of chlorpyrifos and chlorantraniliprole or emamectin benzoate in the range of mass ratio (1 ~ 14): 1 all have different degrees of synergism, among which, the ratio of 4: 1 Most effective. [Conclusion] Ethyl spinosad, bromoxetine and emamectin benzoate had high contact and stomach toxicity to Spodoptera litura. Chlorpyrifos and chlorambucil or A. methicillin Superoxide benzoate to 4: 1 ratio control Symptoms of Spodoptera maximum synergistic effect.