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Field selection for esfenvalerate resistance by the Colorado potato beetle

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Abstract

Five insecticide application regimes were evaluated for two years to determine their influence on the development of esfenvalerate resistance by the Colorado potato beetle (CPB),Leptinotarsa decemlineata (Say). These included sequential applications of esfenvalerate; two alternated uses of esfenvalerate, azinphosmethyl, endosulfan, oxamyl, andBacillus thuringiensis or cryolite; an IPM program; and one early season esfenvalerate application. Both CPB adults and first instars were tested for esfenvalerate resistance before and after insecticide applications. The LC50’s in the early 1992 season were correlated with values in the late 1991 season. However, over the winter, esfenvalerate resistance of CPB adults decreased, but was relatively stable for first instars. Esfenvalerate LC50’s late in the season were generally higher than values early in the season. Increases in esfenvalerate LC50’s were correlated with the number of esfenvalerate applications made in these fields during the growing season, with the greatest increase found in the sequential esfenvalerate treatment.

Compendio

Se evaluaron cinco regímenes de aplicación de insecticidas, durante dos años, para determinar su influencia en el desarrollo de la resistencia al esfenvalerato en el Escarabajo de la Papa de Colorado (CPB), Leptinotarsa decemlineata (Say). Los regímenes incluyeron aplicaciones secuenciales de esfenvalerato; dos usos alternados de esfenvalerato, azinfosmetil, endosul-fan, oxamil y Bacillus thurigiensis o crioliota; un programa de manejo integrado de plagas (IPM); y una aplicación de esfenvalerato al comienzo de temporada. Se probaron tanto los adultos como los primeros estadios del CPB, para resistencia al esfenvalerato antes y después de las aplicaciones de insecticidas. Las LC50’s al comienzo de la temporada de 1992 estuvieron correlacionadas con los valores al final de la temporada de 1991. Sin em-bargo, durante el invierno, la resistencia de los adultos de CPB al esfenvalerato disminuyó, pero fue relativamente estable para los primeros estadios. Las LC50’s al esfenvalerato al final de la temporada fueron por lo general más altas que los valores registrados al comienzo de la temporada. Los incrementos en las LC50’s al esfenvalerato estuvieron correlacionados con el número de aplicaciones del producto hechas en estos campos durante la temporada de cultivo, con los mayores incrementos registrados para el tratamiento secuencial de esfenvalerato.

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Authors
  1. Hanwen Huang
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  2. Zane Smilowitz
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  3. Michael C. Saunders
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  4. Randall Weisz
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Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania, 16802.

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Huang, H., Smilowitz, Z., Saunders, M.C. et al. Field selection for esfenvalerate resistance by the Colorado potato beetle. American Potato Journal 72, 1–12 (1995). https://doi.org/10.1007/BF02874374

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