Journal of Economic Entomology (2010) 103, 2187-2196

Bruce E. Hibbard, Thomas L. Clark, Mark R. Ellersieck, Lisa N. Meihls, Ahmed A. El Khishen, Von Kaster, Henry-York Steiner and Ryan Kurtz (2010)
Mortality of Western corn rootworm larvae on MIR604 transgenic maize roots: field survivorship has no significant impact on survivorship of F1 progeny on MIR604
Journal of Economic Entomology 103 (6), 2187-2196
Abstract: Mortality of western corn rootworm, Diabrotica virgifera virgifera LeConte, larvae due to MIR604 transgenic corn, Zea mays L., expressing the modified Cry3A (mCry3A) protein relative to survivorship on corn with the same genetic background without the gene (isoline corn) was evaluated at three Missouri sites in both 2005 and 2006. We made these comparisons by using wild-type western corn rootworm at three different egg densities (6,000, 3,000, and 1,500 eggs per m) so that the role of density-dependent mortality would be known. The mortality due to the mCry3A protein was 94.88% when averaged across all environments and both years. Fifty percent emergence of beetles was delayed ~5.5 d. Beetles were kept alive and their progeny evaluated on MIR604 and isoline corn in the greenhouse to determine whether survivorship on MIR604 in the field for one generation increased survivorship on MIR604 in the greenhouse in the subsequent generation. There was no significant difference in survivorship on MIR604 in greenhouse assays between larvae whose parents survived isoline and larvae whose parents survived MIR604 in the field the previous generation, indicating that many susceptible beetles survived MIR604 in the field the previous season along with any potentially resistant beetles. The data are discussed in terms of rootworm insect resistance management.
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Link to article at publishers website
Database assignments for author(s): Bruce E. Hibbard, Thomas L. Clark, Ryan W. Kurtz

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diabrotica virgifera	Maize/corn (Zea mays)	U.S.A. (mid N)
Bacillus thuringiensis Cry3A-toxin (entomopathogen)	Diabrotica virgifera	Maize/corn (Zea mays)	U.S.A. (mid N)