Resistance to amitraz and flumethrin in Varroa destructor populations from Veracruz, Mexico
Sóstenes R Rodríguez-Dehaibes, Gabriel Otero-Colina, Violeta Pardio Sedas and Juan A Villanueva Jiménez
Dose response curves were determined for amitraz and flumethrin for Varroa destructor collected near Veracruz city, Mexico. Both pesticides were sprayed at known concentrations on female mites using a Burgerjon’s tower. Probit analysis was performed to calculate mean lethal concentrations (LC50). We estimated the LC50 for amitraz to be 0.526 mg/litre; this estimate is 2.3-times higher than the LC50 baseline established nine years earlier in Mexico. The LC50 for flumethrin was estimated as 0.286 mg/litre, 327-times higher than the LC50 baseline, suggesting the development of resistance.