Resumo

VEGA-GUTIERREZ, Marco T. et al. Susceptibility to insecticides in two mexican populations of tomato-potato psyllid, Bactericera cockerelli (Sulc.) (Hemiptera: Triozidae). Agrociencia [online]. 2008, vol.42, n.4, pp. 463-471. ISSN 1405-3195.

The tomato-potato psyllid, Bactericera cockerelli (Sulc.), is one of the most important pests of chili pepper (Capsicum spp.), tomato (Lycopersicon esculentum Mill.), and potato (Solanum tuberosum L.) in México. Insecticides are used for its control, and the farmers perceive that their biological effectiveness is not satisfactory. In nymphs, LC₅₀, LC₉₅, confidence limits at 95%, values of resistance ratio at a level of LC₅₀ (RR₅₀) and LC₉₅ (RR₉₅) to six insecticides were determined in one susceptible and two field-collected populations (El Huizache, State of San Luis Potosí, and Arteaga-Galeana of Coahuila and Nuevo León). All the populations were susceptible to fenpropathrin, abamectin, cyfluthrin, dimetoate, esfenvalerate, and pyriproxyfen. It is documented that the lack of biological effectiveness in field is not due to resistance to insecticides.

Palavras-chave : resistance to insecticides; tomato-potato psyllid; Paratrioza.