防治草原蝗虫有效药剂的室内筛选

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。

Pharmaceutical Screening of Grassland Locusts in Lab

Locust has often caused serious damage to grasslands.Since it has developed insecticide resistance to some conventional pesticides,it is urgent and necessary to search for new high-efficient and low-toxic insecticides.Methods] Using the immersion method,the toxicities of sixteen insecticides to the third-instar larare of Dasyhippus baybipes and Oedaleus asiaticus were tested in the laboratory.Results] The results showed that after the treatment of 72 h,bifenthrin,imidacloprid,fipronic and β-cypermethrin had high toxicity to D.baybipes and O.asiaticus.Especially,fipronic had the highest toxicity to the two locusts among the sixteen insecticides with LC50 values to the two locusts’ third-instar larvae of 0.186 8,0.231 3 mg/L respectively.Malathion had the lowest toxicity,its values of LC50 to the two locusts’ third-instar larvae were 422.982 1,317.853 8 mg/L respectively.Conclusions] The toxicitie difference of sixteen insecticides between the two locusts can be used for screening of high-efficient and low-toxic insecticides to control grassland locusts.