Journal of Economic Entomology (2014) 107, 1101-1109

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Francis P.F. Reay-Jones and Dominic D. Reisig (2014)
Impact of corn earworm injury on yield of transgenic corn producing Bt toxins in the Carolinas
Journal of Economic Entomology 107 (3), 1101-1109
Abstract: Transgenic corn, Zea mays L., hybrids expressing insecticidal Cry proteins from Bacillus thuringiensis (Bt) and insecticide applications to suppress injury from Helicoverpa zea (Boddie) were evaluated in Florence, SC, and in Plymouth, NC, in 2012 and 2013. Based on kernel area injured, insecticide applications (chlorantraniliprole) every 3-4 d from R1 until H. zea had cycled out of corn reduced injury by 80-93% in Florence and 94-95% in Plymouth. Despite intensive applications of insecticide (13-18 per trial), limited injury still occurred in all treated plots in 2012, except in DKC 68-03 (Genuity VT Double PRO), based on kernels injured (both locations) and proportion of injured ears (Florence only). In 2013, ear injury was low in Plymouth, with no kernel injury in any insecticidetreated plots, except P1498R (non-Bt) and P1498YHR (Optimum Intrasect). Injury in Florence in 2013 did not occur in treated plots of DKC 68-04 (non-Bt), DKC 68-03 (Genuity VT Double PRO), and N785-3111 (Agrisure Viptera). Yields were not significantly affected by insecticide treatment and were not statistically different among near-isolines with and without Bt traits. Yields were not significantly associated with kernel injury based on regression analyses. The value of using Bt corn hybrids to manage H. zea is discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Francis P.F. Reay-Jones, Dominic Reisig

Research topic(s) for pests/diseases/weeds:
damage/losses/economics
control - general
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Helicoverpa zea Maize/corn (Zea mays) U.S.A. (SE)
Bacillus thuringiensis (entomopathogen) Helicoverpa zea Maize/corn (Zea mays)
Bacillus thuringiensis genes in crops (entomopathogen) Helicoverpa zea Maize/corn (Zea mays)
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