Allele frequency of resistance to Cry2Ab2 corn in field populations of fall armyworm in the south region of the United States

Monday, November 17, 2014: 11:24 AM
E146 (Oregon Convention Center)
Ying Niu , Department of Entomology, Louisiana State University, Baton Rouge, LA
Robert L. Meagher , CMAVE, Behavioral and Biological Control Unit, USDA - ARS, Gainesville, FL
Jawwad A. Qureshi , Department of Entomology and Nematology, University of Florida, Immokalee, FL
Xinzhi Ni , Crop Genetics and Breeding Research Unit, USDA - ARS, Tifton, GA
Xiangbing Yang , Texas A&M University, Weslaco, TX
Graham P. Head , Scientific Affairs, Monsanto Company, St. Louis, MO
David L. Kerns , Department of Entomology, Louisiana State University, Winnsboro, LA
D. Henne , Department of Entomology, Texas A&M University, Weslaco, TX
R. Levy , Entomology, Louisiana State University, Baton Rouge, LA
Fei Yang , Entomology, Louisiana State University, Baton Rouge, LA
Vikash Dangal , Department of Entomology, Louisiana State University, Baton Rouge, LA
Fangneng Huang , Department of Entomology, Louisiana State University, Baton Rouge, LA
Fall armyworm (FAW), Spodoptera  frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is a target species of transgenic corn expressing Bacillus thuringiensis (Bt) proteins in both North and South America. From 2013 to 2014, a total of 212 F2 two-parent FAW families were established using single-pair matings of feral individuals collected from seven locations in Texas, Louisiana, Georgia, and Florida. The objective of this study was to determine the frequency of resistance alleles in these populations to Cry2Ab2, a common Bt protein in Bt corn and Bt cotton products. For each F2 family, 128 F2 neonates were screened on leaf tissue of Cry2Ab2 corn plants in the laboratory. Six of the 212 families will be likely positively to possess Cry2Ab2 resistance alleles. Thus, the estimated frequency of Cry2Ab2 resistance alleles in the FAW populations was 0.007 with a 95% credibility interval of 0.0026 to 0.0138.  The results suggest that resistance allele frequency to Cry2Ab2 in FAW populations is likely low in the U.S. southeast region.
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