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Stability of spinosad resistance in Frankliniella occidentalis (Pergande) under laboratory conditions

Published online by Cambridge University Press:  18 February 2008

P. Bielza*
Affiliation:
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203Cartagena, Spain
V. Quinto
Affiliation:
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203Cartagena, Spain
C. Grávalos
Affiliation:
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203Cartagena, Spain
E. Fernández
Affiliation:
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203Cartagena, Spain
J. Abellán
Affiliation:
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203Cartagena, Spain
J. Contreras
Affiliation:
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203Cartagena, Spain
*
*Author for correspondence Fax: +34968325435 E-mail: pablo.bielza@upct.es

Abstract

The stability of spinosad resistance in western flower thrips (WFT), Frankliniella occidentalis (Pergande), populations with differing initial frequencies of resistance was studied in laboratory conditions. The stability of resistance was assessed in bimonthly residual bioassays in five populations with initial frequencies of 100, 75, 50, 25 and 0% of resistant individuals. There were no consistent changes in susceptibility of the susceptible strain after eight months without insecticide pressure. In the resistant strain, very highly resistant to spinosad (RF50>23,000-fold), resistance was maintained up to eight months without further exposure to spinosad. In the absence of any immigration of susceptible genes into the population, resistance was stable. In the case of the population with different initial frequency of resistant thrips, spinosad resistance declined significantly two months later in the absence of selection pressure. With successive generations, these strains did not change significantly in sensitivity. Spinosad resistance in F. occidentalis declined significantly in the absence of selection pressure and the presence of susceptible WFT. These results suggest that spinosad resistance probably is unstable under field conditions, primarily due to the immigration of susceptible WFT. Factors influencing stability or reversion of spinosad resistance are discussed.

Type
Research Paper
Copyright
Copyright © 2008 Cambridge University Press

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