参照FAO推荐的浸渍法，研究了吡虫啉与联苯菊酯的5种配比对麦长管蚜的防治效果。结果表明，吡虫啉和联苯菊酯混配后，表现增效作用的配比为1∶1，2∶1，共毒系数(CTC)分别为273.22，126.17；表现相加作用的配比为1∶2，5∶1，共毒系数(CTC)为95.28，104.65；表现拮抗作用的配比为1∶5，共毒系数(CTC)为60.46。5种配比中以1∶1的配比增效作用最强。

Five kinds ratio of imidacloprid and bifenthrin are reaseached on Macrosiphum avenae (Fabricius) for synergistic effect refered to FAO recommended immersion method. The result shows that mixed ratio of synergistic effect are 1∶1， 2∶1， co-toxicity coefficient(CTC) are 273.22， 126.17， additive effect are 1∶2， 5∶1， CTC are 95.28， 104.65； antagonism effect is 1∶5， CTC is 60.46. The better ratio of synergistic effect was 1∶1， which can provide the reasonable mixed basis for imidacloprid and bifenthrin.

S435.122