Baseline data of four insecticides with different modes of action for Anastrepha fraterculus (Wiedemann) and Ceratitis capitata (Wiedemann)

CARRIZO, B.; PÁEZ JEREZ, P.; RUIZ, M. J.; JUÁREZ, M.L.; MÉNDEZ, D.; TOLABA, G.; MILLA, F.; TAPIA, S.; VERA, M.T.; DE LA VEGA, M. H.

Congreso; 9th Meeting of the Tephritid Workers of the Western Hemisphere; 2016

The Mediterranean fruit fly, Ceratitis capitata (Wiedemann) and the South American fruit fly, Anastrepha fraterculus (Wiedemann) are major economic importance pests in Argentina and worldwide. One method to control them is the use of insecticide in sprays or baits. The repeated use of a particular product exerts a strong selection pressure and can lead to the development of resistance. The aim of this study was to determine baseline data of four insecticides with different action mechanisms through laboratory bioassays. The products used were commercial formulations of cyantraniliprole, chlorpyrifos, lambdacyalothrin and spinosad. The lethal concentration which kills 50% of the individuals (LC50) was estimated with a dose-response curve analysis. Between six and seven concentrations were evaluated for each product. In each replicate 10 individuals of each sex were evaluated for each concentration and between three to four replicates for each product were performed. Cyantraniliprole and chlorpyrifos were equally susceptible for males and females of both species. For lambdacyalothrin differences between the two species were detected. For this product, the LC50 of A. fraterculus was significantly lower than that of C. capitata indicating that A. fraterculus is more sensitive to this compound than C. capitata. These results generate reference values for Argentina that will contribute as baseline for field surveys of natural populations on which chemical control is exercised. It also provides valuable information at the time of choosing active ingredients and rotation schemes.