| company amplification of estalpha2/estbeta2 and correlation between esterase gene copy number and resistance to insecticides in the field culex pipiens pallens strains collected from beijing, china. | seven field strains of culex pipiens pallens were evaluated in the summer of 2004 for their susceptibility to three insecticides. larval bioassays were carried out in accordance with who mosquito susceptibility tests. field samples showed resistance to dichlorvos and propoxur. low levels of resistance to phoxim were detected compared with the laboratory-susceptible strain. quantitative analysis showed that co-amplification of estalpha2 and estbeta2 occurred in the seven field cx. pipiens pallens ... | 2009 | 19496425 |