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 insecticide-treated 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.
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Claims 8
Claim · model-written summary
Repeated chlorantraniliprole applications reduced corn kernel injury by 80-93% in Florence.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- insecticide applications (chlorantraniliprole) every 3-4 d from R1e0
- Interactor
- H. zea
.jpg?width=60)
Helicoverpa zeae0pest - Outcome
- injurye0
- Direction
- reducede0
- Value
- 80-93%e0
- Setting
- Florencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“insecticide applications (chlorantraniliprole) every 3-4 d from R1 until H. zea had cycled out of corn reduced injury by 80-93% in Florence”
t0“Corn Earworm Injury on Yield of Transgenic Corn”
Claim · model-written summary
Repeated chlorantraniliprole applications reduced corn kernel injury by 94-95% in Plymouth.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- insecticide applications (chlorantraniliprole) every 3-4 d from R1e0
- Interactor
- H. zeaHelicoverpa zeae0pest
- Outcome
- injurye0
- Direction
- reducede0
- Value
- 94-95%e0
- Setting
- Plymouthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Corn Earworm Injury on Yield of Transgenic Corn”
Claim · model-written summary
In 2012, limited injury remained in nearly all insecticide-treated plots except DKC 68-03.
Not reportedTaxon
Verbatim
e0“limited injury still occurred in all treated plots in 2012, except in DKC 68-03 (Genuity VT Double PRO)”
Claim · model-written summary
In Plymouth in 2013, no kernel injury occurred in insecticide-treated plots except P1498R and P1498YHR.
Not reportedTaxon
Verbatim
e0“In 2013, ear injury was low in Plymouth, with no kernel injury in any insecticide-treated plots, except P1498R (non-Bt) and P1498YHR (Optimum Intrasect)”
Claim · model-written summary
In Florence in 2013, treated plots of DKC 68-04, DKC 68-03 and N785-3111 had no injury.
Not reportedTaxon
Verbatim
e0“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)”
Claim · model-written summary
Corn yield did not differ significantly with insecticide treatment.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- insecticide treatmente0
- Outcome
- Yieldse0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were not significantly affected by insecticide treatment”
t0“Transgenic Corn”
Claim · model-written summary
Corn yield was not statistically different among near-isolines with and without Bt traits.
- Taxon
- CornZea mays subsp. mayst0
- Material
- near-isolinese0
- Outcome
- Yieldse0
- Direction
- not statistically differente0
- Comparator
- with and without Bt traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were not significantly affected by insecticide treatment and were not statistically different among near-isolines with and without Bt traits”
t0“Transgenic Corn”
Claim · model-written summary
Corn yield was not significantly associated with kernel injury.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Yieldse0
- Direction
- not significantly associatede0
- Comparator
- kernel injurye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were not significantly associated with kernel injury based on regression analyses”
t0“Transgenic Corn”
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