Niveles de resistencia en poblaciones de Tetranychus urticae en el cultivo de la fresa

Abstract

Two field populations of Tetranychus urticae were collected from commercial strawberry fields in the state of Guanajuato, Mexico to be compared against a susceptible laboratory strain. The population called line L1 was collected from fields with miticide rotations; the line L2 was obtained from fields without miticide rotations. Both lines were taken to the acarology lab of Antonio Narro University where a series of bioassays were conducted using the leaf dipping technique in order to determine resistance levels in relation to the susceptible laboratory line N-s (susceptible line Antonio Narro University). The results indicate that line L1 shows a resistance ratio of 106.4, 3.7, 5.0, 1.4, and 3.5X for the products Abamectin, Bifenthrin, Dichophol, Fenbutaine oxide and Naled, respectively. Line L2 showed a resistance ratio of 57.4, 8.0, 11.2, 11.3, and 9X against the same acaricides.