苯甲酰基脲类杀虫剂对黑粪蚊生长发育和繁殖的影响

Effects of Benzoylphenylurea Insecticides on Growth,Development and Reproduction of Scatopse sp.

为明确苯甲酰基脲类杀虫剂(Benzoylphenylurea insecticides,BPUs)对黑粪蚊(Scatopse sp.)的毒力以及致毒作用,采用浸渍法测定了虱螨脲、氟啶脲、氟虫脲、氟铃脲4种BPUs对黑粪蚊幼虫的毒力作用、生长发育和繁殖的影响。结果表明,虱螨脲和氟啶脲对2龄幼虫的毒力相对较高,LC50分别为2.627、3.791 mg/L。4种药剂的亚致死浓度均引起2龄幼虫发育历期和蛹期延长。在LC40处理下氟啶脲、虱螨脲4龄幼虫期较对照(以无菌水代替药液)分别延长了2.31、2.11 d。在LC40处理下氟啶脲对2龄幼虫的抑制作用最强,化蛹率、羽化率分别为60.56%、72.56%,虱螨脲的化蛹率、羽化率分别为65.21%、76.45%。氟啶脲、虱螨脲对单雌产卵量也有明显的抑制作用,较对照分别下降41.78%、37.53%。表明氟啶脲和虱螨脲是防治黑粪蚊的理想药剂,低龄幼虫期(2龄幼虫期前)是使用这2种BPUs的最佳时期,能充分发挥该药剂对黑粪蚊的生长发育和繁殖的抑制作用。

To determine the toxicity and toxic effects of benzoylphenylurea insecticides(BPUs)against Scatopse sp.,impregnation method was used to determine the effects of four BPUs,lufenuron,chlorfluazuron,flufenoxuron and hexaflumuron,on the toxicity,growth,development and reproduction of larvae stage.The results showed that the toxicity of lufenuron and chlorfluazuron to the 2nd instar larvae was relatively high,with LC50 of 2.627 mg/L and 3.791 mg/L,respectively.The developmental duration of 2nd instar larvae and pupal stage were prolonged under the sublethal concentration of four BPUs.The 4th larva stage of chlorfluazuron and lufenuron under LC40 treatment were extended by 2.31 d and 2.11 d respectively,compared with the control(use sterile water instead of liquid medicine).Under LC40 treatment,chlorfluazuron had the strongest inhibition effect on the pupation rate and eclosion rate of 2nd instar larvae,which were 60.56%and 72.56%respectively,and pupation rate and eclosion rate of lufenuron were 65.21%and 76.45%respectively.Chlorfluazuron and lufenuron had significant inhibition effect on the eggs laid per female,which decreased by 41.78%and 37.53%respectively,compared with the control.These results indicate that chlorfluazuron and lufenuron are ideal pesticides against Scatopse sp.,the young larvae stage(before 2nd instar larvae)is the best time to use two kinds of BPUs,the inhibition effect of BPUs on the growth,development and fecundity of Scatopse sp can be gave full play.