| continuous, mixed, and alternating exposure to deltamethrin and fenthion affect development of resistance in culex pipiens pallens in china. | a field population of culex pipiens pallens was collected from nanjing, china on july in 2000 and reared in an insectarium. larvae were subjected to single, mixed, and alternating exposure to deltamethrin and/or fenthion, and the surviving early 4th instars were reared for establishment of adult colonies. larvae from the colonies were then subjected to the same selection pressures over the subsequent 15 generations. resistance rates and ratios were measured as lc50 values derived from larval bio ... | 2007 | 17939515 |