-In two fi eld-collected populations of de Bemisia tabaci (Gennadius) B biotype previously selected with the neonicotinoid insecticide thiamethoxam (NEO-R, NEO-N), and a population susceptible to insecticides (SUSC), the level of response to the insecticide thiametoxam, as well as the life and fertility tables were determined. At LC 95 , the NEO-R population showed a resistance ratio (RR 95 ) value of 8.8-fold, an intrinsic rate of increase (r m ) of 0.72. The fi tness of the NEO-R and NEO-N populations in relation to the SUSC was 1.5 and 2.0, respectively. The RR 95 value for NEO-N was 1.9-fold; it´s r m value was 0.082, while in the SUSC population was 0.041. The developmental time of egg and adult were longer in NEO-R population, while the nymph and pupa lasted longer in the NEO-N and SUSC populations. The developmental time was different in the three NEO-R, NEO-N, and SUSC populations with 19.7 d (315.84 degree days or dd), 15.7 d (250.4 dd) and 18.5 d (296.6 d), respectively. The populations previously selected with thiamethoxam did not reproduce faster than their susceptible counterpart.
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