Toxicity and metabolism of z-cypermethrin in field-collected and laboratory strains of the Neotropical generalist predator Chrysoperla externa

SMAGGHE G; SPANOGHE P; NIU J; ALZOGARAY RA; HARAMBOURE M; CHRISTIAENS O

NEOTROPICAL ENTOMOLOGY

ENTOMOLOGICAL SOC BRASIL

Lugar: BRASIL; Año: 2017 vol. 46 p. 310 - 315

1519-566X

Resistance to pesticides has been studied in several insect pests, butinformation on the natural enemies of pests?including the Neotropicalpredator Chrysoperla externa Hagen (Neuroptera: Chrysopidae), a majorbiological control agent in South America?is lacking. We report here acomparative study between a field-collected strain of C. externa subjectedto monthly sprayings of pyrethroids and neonicotinoids and a laboratorystrain without exposure to pesticides. The tolerance of both strains againstzeta-cypermethrin was similar, and addition of the synergist piperonylbutoxide increased the toxicity by 30% in both strains. Gas-chromatographyanalyses and mixed-function-oxidase measurements indicated similar valuesin both strains and also confirmed the key role of oxidative metabolism in thisspecies. Because C. externa has maintained a tolerance to zeta-cypermethrinwithout previous pesticide exposure, this species could potentially be massrearedand released in fields in the presence of pesticide pressure.