六种常见杀虫剂对西花蓟马和花蓟马的毒力测定

摘要

为了明确常用杀虫剂对入侵害虫西花蓟马和本地近缘优势种花蓟马的毒力作用,在室内采用菜豆浸渍饲喂法,分别测定了6种常用杀虫剂对云南昆明地区两种蓟马2龄若虫、雌虫及雄虫的毒力.结果表明:6种杀虫剂对西花蓟马和花蓟马2龄若虫和成虫的LC50以6％乙基多杀菌素的最低,对西花蓟马和花蓟马2龄若虫和成虫LC50值分别为:0.611、0.333 mg/L和1.731、1.202 mg/L;LC50值以10％吡丙醚最高,对西花蓟马和花蓟马2龄若虫和成虫LC50值分别为1238.005、845.819 mg/L和9037.110、4766.376 mg/L.6种杀虫剂对西花蓟马和花蓟马各虫态的毒力作用依次为:乙基多杀菌素＞阿维菌素＞溴氰菊酯＞啶虫脒＞吡虫啉＞吡丙醚,且所有供试杀虫剂对西花蓟马LC50均大于花蓟马,对雌虫LC50大于雄虫.说明了蓟马雌虫对杀虫剂的敏感度低于雄虫,且生物源杀虫剂的室内杀虫效果强于化学杀虫剂,是西花蓟马防治中优先选择的杀虫剂.%To identify the toxicity of current commonly used pesticides to invasive pests,Western flower thrips Frankliniella occidentalis and native closely dominant species flower thrips F.intonsa.The toxicity of six pesticides on this two pests 2nd instar nymphs,female and male in laboratory were conducted use of bean dipping feeding method.The results showed that 6％ Spinetoram was holds the lowest LC50valueon the 2nd instar nymphs and adults,which was 0.611、0.333 mg/L and 1.731、1.202 mg/L for F.occidentalis and F.intonsa,respectively;10％ Pyriproxyfen holds the highest LC50 value on the 2nd instar nymphs and adults,which was 1238.005、845.819 mg/L and 9037.110、4766.376 mg/L for F.occidentalis and F.intonsa,respectively.The toxicity of six pesticides on this two pests state of F.occidentalis and F.intonsa were as follows:Spinetoram ＞ Avermectin ＞ Deltamethrin ＞ Acetamiprid ＞ Imidacloprid ＞ Pyriproxyfen,the role of LC50 for six tested pesticides on F.occidentalis were larger than that on F.intonsa,and females were larger than that on males on both thrips.The sensitivity to pesticides of thrips females than that on males,and the biogenic pesticides hold the better indoor insecticidal efficacy than chemical pesticides,it should be the first choice insecticide in thrips control.