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ViewAttendees 2

10-Minute Paper

Plant-Insect Ecosystems

P-IE: IPM - Field Crops 1

Longitudinal studies illustrate the declining efficacy of Bt corn in reducing injury from Helicoverpa zea in the southeastern United States

Wednesday, November 8, 2023
8:36 AM – 8:48 AM ET
Location: Gaylord National Resort & Convention Center, Maryland 5-6
In-Person
Field trials were conducted from 2009-2022 to evaluate transgenic corn, Zea mays L., hybrids expressing insecticidal Cry proteins from Bacillus thuringiensis (Bt) in Georgia, North Carolina, and South Carolina to suppress injury from Helicoverpa zea (Boddie). Trials included near-isolines of non-Bt and Bt hybrids expressing either Cry1A.105 + Cry2Ab2 or Cry1Ab + Cry1F. Overall, the data show a declining efficacy over time of Bt hybrids in reducing kernel injury from H. zea feeding due to the development of widespread resistance. The data also reveal spatial and temporal variability in H. zea injury in the southeastern U.S., including trends in increasing H. zea injury in later planting dates. Implications of the data on the value of planting Bt corn in the southeastern U.S. and on IRM will be discussed.