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Managing resistance to Bt crops in a genetically variable insect herbivore, Ostrinia nubilalis
Ecological Applications
  • Megan E. O'Rourke, Cornell University
  • Thomas W. Sappington, Iowa State University
  • Shelby J. Fleischer, Pennsylvania State University
Document Type
Article
Publication Date
7-1-2010
DOI
10.1890/09-0067.1
Abstract

To slow the resistance evolution of the European corn borer (ECB) to Cry proteins expressed in transgenic Bacillus thuringensis (Bt) corn, the United States Environmental Protection Agency (EPA) has adopted an insect resistance management (IRM) plan that relies on a “high dose/refuge” strategy. However, this IRM plan does not consider possible ecological differences between the two ECB pheromone races (E and Z). Using carbon isotope analysis, we found that unstructured (non-corn) refuges contribute more to E race (18%) than to Z race (4%) populations of ECB in upstate New York (USA). Furthermore, feeding on non-corn hosts is associated with decreased body mass and reduced fecundity. We also show that the geographic range of E-race ECB is restricted within the range of the Z race and that E-race ECB are increasingly dominant in regions with increasing non-corn habitat. While the proportion of E-race ECB developing in unstructured refuges is higher than previously assumed, low rates of unstructured refuge use by the Z race, evidence for reduced fecundity when reared on non-corn hosts, and complete sympatry within the E race range all argue against a relaxation of current IRM refuge standards in corn based on alternative-host use. We also discuss implications of this research for integrated pest management in vegetables and IRM in Bt cotton.

Comments

This article is from Ecological Apllications 20 (2010): 1228, doi:10.1890/09-0067.1

Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
Date Available
2014-10-02
File Format
application/pdf
Citation Information
Megan E. O'Rourke, Thomas W. Sappington and Shelby J. Fleischer. "Managing resistance to Bt crops in a genetically variable insect herbivore, Ostrinia nubilalis" Ecological Applications Vol. 20 Iss. 5 (2010) p. 1228 - 1236
Available at: http://works.bepress.com/thomas_sappington/12/