SUDIES ON RESISTANCE OF MYZUS PERSICAE(SULZER)IN THE MIDDLE TOBACCO REGIONS

The Myzus persicae(Sulzer)was collected from six main areas of planting tobacco of Henan prov- ince and Hubei province.The resistance to fenvalerate,imidacloprid,omethoate,and methomyl was tested by topical application of cappillary tube.The results showed that the resistance ratios of YZ-opoulation the Myzus persicae(Sulzer)collected from Yuzhou area to fenvalerate was 14.68 times ces comperead to that of susceptuble populatron.That of resistance rations were 5.50、2.18and 2.20 folds to omethoate,methomyl and imidacloprid comared with YZ-population.The resistance ratio of XX-population(collected from Xiangxian area).BY-pop- ulation(collected from Biyang area).ZG-population(collected from Zigui zrea).XE-population(collected from Xun'en area)and CY-population(collected from Changyang area)was 12.78,12.04,11.24,9.36,and 7.93 folds to fenvalerate respectinely.