Journal
PEST MANAGEMENT SCIENCE
Volume 65, Issue 3, Pages 235-240Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.1674
Keywords
Bemisia tabaci; fitness cost; pyriproxyfen; biotype; number of loci; insecticide resistance
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Funding
- United States Environmental Protection Agency under the Science to Achieve Results Graduate Fellowship Program [FP-916489010]
- Achievement Rewards for College Scientists scholarship
- NRICGP [2005-00925]
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BACKGROUND: The insect growth regulator pyriproxyfen has provided effective control of the whitefly Bemisia tabaci 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 overtime 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 traits were 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. (C) 2008 Society of Chemical Industry
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