Susceptibility of a Mexican Field-Collected Wild Population of <i>Diaphorina citri</i> (Hemiptera: Liviidae) to Selected Insecticides

Abstract The Asian citrus psyllid, Diaphorina citri (Kuwayama) (Hemiptera: Liviidae), is a severe pest of orchards worldwide. Its control based mainly on the use conventional insecticides, and resistance to many those compounds widespread. Phenotypic bioassays detect compare response field-collected population with laboratory-reared that susceptible insecticides. This comparison usually does not involve counterpart since its existence currently rare. We found an isolated field D. living wild host, orange jasmine (Murraya paniculata [L.] Jack). Considering lifetime fly capacity, gene flow any insecticide-treated was nonexistent or negligible. Thus, we determined in fourth-instar nymphs unsexed 2- 5-d-old adults commercial formulations commonly used insecticides chlorpyrifos, malathion, imidacloprid, spinosad. In bioassays, insects were placed leaf discs previously immersed for 10 s respective insecticide concentrations. For adults, lowest concentration–mortality chlorpyrifos (lethal concentration 50 [LC50] 0.72 mg L-1 lethal 95 [LC95] 1.02 L-1). highest toxicity malathion (LC95 0.05 observed spinosad (LC50 0.007, LC95 0.021 estimated LC50 values lower than documented worldwide these populations citri.