Lack of fitness costs associated with pyriproxyfen resistance in the B biotype of Bemisia tabaci

David W. Crowder, Christa Ellers-Kirk, Bruce E. Tabashnik, Yves Carrière

Research output: Contribution to journalArticle

16 Scopus citations


BACKGROUND: The insect growth regulator pyriproxyfen has provide deffective control of the whitefly Bemisiatabaci Gennadius in many countries. Here, whether or not fitness costs were associated with pyriproxyfen resistance in a laboratory-selected resistant strain (QC02-R) of the B biotype was determined. RESULTS: Mortality caused by pyriproxyfen and fitness traits over time were measured in unselected and selected hybrid strains, which were created by crossing individuals of the resistant strain with individuals of a susceptible strain. Fitness costs were not associated with resistance in QC02-R, as mortality caused by pyriproxyfen did not increase over time in unselected hybrid strains and fitness traitswere similar in unselected and selected hybrid strains. Using a new method to examine the inheritance of resistance, based on data from fitness cost experiments, it was estimated that pyriproxyfen resistance is controlled by two loci in the QC02-R strain. CONCLUSION: The lack of fitness costs associated with pyriproxyfen resistance could promote the evolution of resistance in field populations with similar traits to QC02-R.

Original languageEnglish (US)
Pages (from-to)235-240
Number of pages6
JournalPest management science
Issue number3
StatePublished - Mar 1 2009



  • Bemisia tabaci
  • Biotype
  • Fitness cost
  • Insecticide resistance
  • Number of loci
  • Pyriproxyfen

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Insect Science

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