Aptitud Biologica de Poblaciones de Bemisia tabaci (Gennadius) Biotipo B (Hemiptera: Aleyrodidae) con Diferente Susceptibilidad al InsecticidaThiametoxam

摘要

In two field-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 , the NEO-R population showed a resistance ratio (RRgj) value of 8.8-fold, an intrinsic rate of increase (r_n) of 0.72. The fitness 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 aduh were longer in NEO-R population, while the nymph and pupalasted 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 previouslyselected with thiamethoxam did not reproduce faster than their susceptible counterpart.