Document Detail

Modeling evolution of resistance to pyriproxyfen by the sweetpotato whitefly (Homoptera: Aleyrodidae).
MedLine Citation:
PMID:  16937698     Owner:  NLM     Status:  MEDLINE    
We used computer simulations to examine evolution of resistance to the insect growth regulator (IGR) pyriproxyfen by the sweetpotato whitefly, Bemisia tabaci (Gennadius), biotype B [=Bemisia argentifolii (Bellows & Perring)]. Consistent with trends seen in cotton (Gossipyium spp.) fields in Arizona and Israel, results suggest that evolution of resistance to pyriproxyfen may occur rapidly in this haplodiploid insect. Similar to results from models of diploid insects, resistance evolved faster with increases in toxin concentration, dominance of resistance in females, the initial frequency of the resistance allele, and the proportion of the region treated with pyriproxyfen. Resistance was delayed by fitness costs associated with resistance. Movement between treated and untreated cotton fields had little effect, probably because untreated cotton leaves provided internal refuges in treated fields and whiteflies were controlled with other insecticides in external refuges. Resistance evolved faster when susceptibility to pyriproxyfen was greater in susceptible males than susceptible females. In contrast, resistance evolved slower when susceptibility to pyriproxyfen was greater in resistant males than resistant females. Results suggest that growers may be able to prolong the usefulness of pyriproxyfen by applying lower toxin concentrations and promoting susceptible populations in refuges.
David W Crowder; Yves Carrière; Bruce E Tabashnik; Peter C Ellsworth; Timothy J Dennehy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of economic entomology     Volume:  99     ISSN:  0022-0493     ISO Abbreviation:  J. Econ. Entomol.     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-08-29     Completed Date:  2006-10-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985127R     Medline TA:  J Econ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1396-406     Citation Subset:  IM    
Department of Entomology, University of Arizona, Tucson, AZ 85721, USA.
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MeSH Terms
Gene Frequency
Genes, Dominant
Gossypium / parasitology
Hemiptera / genetics*
Insecticide Resistance / genetics
Juvenile Hormones*
Models, Genetic
Sex Ratio
Reg. No./Substance:
0/Insecticides; 0/Juvenile Hormones; 0/Pyridines; 95737-68-1/pyriproxyfen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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