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P-IE

Student Competition 10-Minute Paper

Grad 10-min: P-IE, IPM Field Crops 2

Resistance allele frequency to Cry1Ab and Vip3A proteins in the corn earworm, Helicoverpa zea (Boddle), in the southeastern region of United States

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Presenting Author(s)

Shucong Lin

Louisiana State University AgCenter
Banton Rouge, Louisiana

Co-Author(s)

Wenbo Yu

Louisiana State University
Baton Rouge, Louisiana
Ying Niu

Louisiana State University Agricultural Center
Baton Rouge, Louisiana
Oi

Oyediran O. isaac

Syngenta Crop Protection LLC
Research Triangle Park, North Carolina
MD

Marcelo Dimase

University of Alberta
Baton Rouge, Louisiana
FR

Francis P.F. Reay-Jones

Clemson University
Florence, South Carolina
SB

Sebe Brown

University of Tennessee
Jackson, Tennessee
DC

Donald Cook

Mississippi State University
Stoneville, Mississippi
Xn

Xinzhi ni, n/a

2Crop Genetics and Breeding Research Unit, USDA-ARS
Tifton, Georgia
YZ

Yan Zhang

Syngenta Crop Protection LLC
Ardmore, Oklahoma

The corn earworm, Helicoverpa zea (Boddie), is a target pest of Bt corn in the United States. Cry1Ab and Vip3A are two common Bacillus thuringiensis (Bt) proteins expressed in transgenic corn plants. The objective of this study was to determine the resistance allele frequency to Cry1Ab and Vip3A in H. zea in the southeastern region of the United States. By using a F₂ screen with diet-overlay bioassay, F₂ progeny produced from 206 and 216 field-collected individuals of H. zea in Louisiana, Mississippi, Georgia, and South Caroline during 2017-2019 were examined for resistance alleles to Cry1Ab and Vip3A, respectively. A high (0.453) Cry1Ab resistance allele frequency was detected in the collections, while none of the individuals possessed major resistance alleles to Vip3A. The results showed that resistance to Cry1Ab in H. zea has occurred in the field, but Vip3A resistance alleles are likely rare. Information generated from this study should be useful in resistance monitoring and development management strategies to preserve the Vip3A susceptibility in H. zea.