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[目的]蝗虫对草原危害很严重,多年的化学防治对常规药剂产生了抗性,寻找高效低毒药剂很有必要。[方法]采用浸渍叶片法测定了16种药剂对毛足棒角蝗和亚洲小车蝗的3龄若虫的室内毒力。[结果]联苯菊酯、吡虫啉、氟虫腈、高效氯氰菊酯对毛足棒角蝗和亚洲小车蝗都表现出很高的毒力作用,其中氟虫腈对这2种蝗虫的毒力最高,72 h的LC50值分别为0.1868、0.2313 mg/L,马拉硫磷对这2种蝗虫的毒力最低,72 h的LC50值分别为422.982 1、317.853 8 mg/L。[结论]16种药剂对这2种蝗虫毒力的差异,可用于草原蝗虫高效低毒药剂的筛选。
[Objective] Grasshoppers are very dangerous to grasslands. For many years, chemical control has become resistant to conventional chemicals. It is necessary to find efficient and low toxic agents. [Method] The indoor toxicity of 16 kinds of medicament to the 3rd instar nymphs of A. fulvarius and A. xylostella were determined by immersion leaf method. [Result] Bifenthrin, imidacloprid, fipronil and beta - cypermethrin all showed high virulence to A. tabacidi and A. asiatica, and fipronil had the highest toxicity to these two locusts. The LC50 values at 72 h were 0.1868 and 0.2313 mg / L respectively, and the malathion had the lowest toxicity to these two locusts. The LC50 values at 72 h were 422.982 and 1,317.853 8 mg / L, respectively. [Conclusion] The differences of the virulence of 16 kinds of locusts against these two locusts could be used to screen the locusts with high efficiency and low toxicity.