Susceptibilidad y mecanismos de resistencia de Tetranychus urticae (Acariformes: Tetranychidae) en rosal de invernaderos

the degree of resistance of a tetranychus urticae population, from production greenhouse roses, was determined for five miticides from different toxicological groups in comparison to a laboratory line. the presence of enzymes related to that resistance was also evaluated. several bioassays were conducted on the laboratory line to establish the slope of the concentration /mortality relationship. afterwards, the value of lc90 was selected and doubled to obtain a diagnostic concentration, in such a way that applying it to the field line would determine the degree of resistance. lastly, biochemical tests were conducted to detect enzymes related to the resistance. the highest levels of α and β-esterase and oxidases were presented in the field population. these results suggest that α and β-esterase and oxidases are involved in the resistance of the population studied.