20%虫螨腈·唑虫酰胺微乳剂对豇豆蓟马的杀虫活性

Insecticidal Activity of Chlorfenapyr + Tolfenpyrad 20% Microemulsion against Thrips on Cowpea

通过室内叶管药膜法和田间喷雾法测定20%虫螨腈·唑虫酰胺微乳剂对豇豆蓟马的杀虫活性。结果表明, 20%虫螨腈·唑虫酰胺微乳剂对豇豆蓟马成虫具有很强的协同增效作用,其毒力回归方程为3. 943 5+1. 5285x, LC50值为4. 91 mg/L,共毒系数(CTC)为196;田间防治试验显示, 20%虫螨腈·唑虫酰胺微乳剂对豇豆蓟马具有明显的控制作用,在处理剂量为50 g/667m2时,药后7 d的防治效果仍可达65. 55%,与对照药剂乙基多杀菌素(62. 03%)无显著性差异。20%虫螨腈·唑虫酰胺微乳剂可作为防治豇豆蓟马的专用药剂。

Insecticidal activity of chlorfenapyr+tolfenpyrad 20%microemulsion against thrips on cowpea was determined by the leaf-tube residual bioassay in the laboratory and spraying in the field.The results showed that this preparation had a high contact toxicity against the adults of thrips on cowpea with a linear regression equation of 3.943 5+1.528 5 x and LC50 value of 4.91 mg/L,which displayed that tolfenpyrad exhibited a strong synergistic effect on chlorfenapyr,with a co-toxicity coefficient(CTC)being as high as 196.The field spraying trials showed that chlorfenapyr+tolfenpyrad 20%microemulsion had significant control effects on thrips infesting cowpea.This preparation still had a control effect of65.55%on the thrips 7 days after sprayed at a rate of 50 g/ha,which was not significantly different from the control treatment spinetoram(62.0%).It is concluded that chlorfenapyr+tolfenpyrad 20%microemulsion can be used as a special insecticide to control thrips infesting cowpea.