Insecticide-resistance ratios of three populations of Bactericera cockerelli (Hemiptera: Psylloidea: Triozidae) in regions of northern Mexico
Keywords:
resistance, psyllid, solanumAbstract
Bactericera cockerelli Šulc (Hemiptera: Psylloidea: Triozidae), also known as the potato psyllid, is a pest of pepper and potato crops in northern Mexico. Growers control it by applying insecticides, without knowing the tolerance or resistance levels to these pesticides. The goal of this study was to determine the resistance ratios of several populations of B. cockerelli from regions of northern Mexico. Three populations of B. cockerelli were collected from sample sites at Coahuila–Nuevo León, San Luis Potosí, and Aguascalientes and compared with a laboratory susceptible line. Results indicated that populations from Aguascalientes had resistance ratios of 1.69-, 1.26-, and 1.00-fold for the insecticides abamectin, endosulfan, and imidacloprid, respectively. The corresponding ratios were 10.72-, 2.52-, and 3.75-fold for the San Luis Potosí population and 2.57-, 3.75-, and 4.22-fold for the Coahuila–Nuevo León population. We conclude that the B. cockerelli population of only San Luis Potosí was resistant to abamectin, but that the other 2 populations were susceptible to it. All 3 populations were fairly susceptible to endosulfan and imidacloprid.
Resumen
El pulgón saltador, Bactericera cockerelli Šulc (Hemiptera: Psylloidea: Triozidae), es una plaga importante afectando las regiones paperas y productoras de chile del Norte de México por los daños directos e indirectos que ocasiona. Su control está basado en la aplicación de insecticidas, sin tener conocimiento de la tolerancia o resistencia para el manejo eficiente de esta plaga. Por lo que, esta investigación tiene como objetivo determinar la proporción de resistencia de diferentes poblaciones B. cockerelli provenientes de regiones productoras del Norte de México. Se recolectaron tres poblaciones de campo de B. cockerelli (Coahuila–Nuevo León, San Luis Potosí, y Aguascalientes) y se compararon con una línea susceptible de laboratorio. Los resultados indicaron que la población de Aguascalientes presentaron una proporción de resistencia de: 1.69, 1.26 y 1.00 veces para los insecticidas abamectina, endosulfan, e imidacloprid respectivamente, para la población San Luis Potosí los valores fueron de: 10.72, 2.52 y 3.75 veces y para la población Coahuila–Nuevo León: 2.57, 3.75 y 4.22 para los mismos insecticidas respectivamente. Por lo que se concluye que la población de San Luis potosí, presentó problemas de resistencia al insecticida abamectina, al igual que la de Coahuila–Nuevo-León; el resto de los insecticidas mostraron susceptibilidad.
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