Managing resistance to Bt crops in a genetically variable insect herbivore, Ostrinia nubilalis

Megan E. O'Rourke, Thomas W. Sappington And, Shelby J. Fleischer

Research output: Contribution to journalArticle

24 Citations (Scopus)

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 noncorn 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.

Original languageEnglish (US)
Pages (from-to)1228-1236
Number of pages9
JournalEcological Applications
Volume20
Issue number5
DOIs
StatePublished - Jul 1 2010

Fingerprint

herbivore
insect
maize
resistance management
crop
refuge
fecundity
host use
integrated pest management
sympatry
pheromone
body mass
vegetable
carbon isotope
cotton
environmental protection
protein
habitat

All Science Journal Classification (ASJC) codes

  • Ecology

Cite this

O'Rourke, Megan E. ; Sappington And, Thomas W. ; Fleischer, Shelby J. / Managing resistance to Bt crops in a genetically variable insect herbivore, Ostrinia nubilalis. In: Ecological Applications. 2010 ; Vol. 20, No. 5. pp. 1228-1236.
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Managing resistance to Bt crops in a genetically variable insect herbivore, Ostrinia nubilalis. / O'Rourke, Megan E.; Sappington And, Thomas W.; Fleischer, Shelby J.

In: Ecological Applications, Vol. 20, No. 5, 01.07.2010, p. 1228-1236.

Research output: Contribution to journalArticle

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