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10-Minute Presentation

Plant-Insect Ecosystems

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

Long-term evaluation of the yield benefits of Bt corn in the southeastern United States

Tuesday, November 12, 2024
4:24 PM – 4:36 PM MST
Location: Phoenix Convention Center, 127 C, PCC
Oral Presentation
Field trials were conducted from 2009-2023 to evaluate transgenic corn, Zea mays L., hybrids expressing insecticidal Cry proteins from Bacillus thuringiensis (Bt) in Georgia, North Carolina, and South Carolina. Trials included near-isolines of non-Bt and Bt hybrids expressing either Cry1A.105 + Cry2Ab2 or Cry1Ab + Cry1F. Overall, the yields of both Bt and non-Bt corn generally declined as trials were planted later in the season relative to earlier planting dates. Parallel to declining yields with planting date, the yield benefit of Bt corn compared to non-Bt corn generally increased with planting date, although the data show considerable spatial and temporal variability. Implications of the data on the value of planting Bt corn in the southeastern U.S. will be discussed as it relates to management of corn earworm, Helicoverpa zea, and fall armyworm, Spodoptera frugiperda.