Abstract
The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a major pest of corn in North and South America. It is managed primarily with transgenic corn-producing insecticidal proteins of Bacillus thuringiensis (Bt), but the development of resistance threatens their durability and necessitates the use of alternative management strategies. We conducted late-planted field trials during 2016 and 2017 in South Carolina using natural infestations. We evaluated the use of Bt and non-Bt corn hybrids in combination with foliar applications of chlorantraniliprole at varying infestation thresholds to protect field corn from infestation and damage and determine effects on grain yield. All Bt hybrids were more effective at reducing fall armyworm infestation rates and leaf injury than multiple insecticide sprays, and no Bt hybrid reached the lowest infestation threshold (20%) to require supplemental insecticide treatments, despite infestations in non-Bt corn reaching >68% in each year. The only Bt and/or insecticide treatment to significantly reduce ear feeding or the proportion of ears injured (mainly by Helicoverpa zea [Boddie]) was the Bt hybrid pyramid producing Vip3A. However, significant protection of yield was detected only in the Bt hybrids producing Cry1A.105 + Cry2Ab2. All Bt traits tested in this study were effective in reducing infestation and feeding damage from fall armyworm, although this did not always result in significant protection of yield. Our results demonstrate the potential and limitations of using chlorantraniliprole with Bt (when resistance is present) and non-Bt corn to manage this pest.
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Claims 7
Claim · model-written summary
All Bt corn hybrids reduced fall armyworm infestation more effectively than multiple sprays.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Bt hybridse0
- Interactor
- fall armyworm
.jpg?width=60)
Spodoptera frugiperdae0pest - Outcome
- fall armyworm infestation ratese0
- Direction
- reducinge0
- Comparator
- multiple insecticide sprayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“All Bt hybrids were more effective at reducing fall armyworm infestation rates and leaf injury than multiple insecticide sprays, and no Bt hybrid reached the lowest infestation threshold (20%) to require supplemental insecticide treatments, despite infestations in non-Bt corn reaching >68% in each year.”
t0“corn”
Claim · model-written summary
All Bt corn hybrids reduced leaf injury more effectively than multiple sprays.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Bt hybridse0
- Interactor
- fall armywormSpodoptera frugiperdae0pest
- Outcome
- leaf injurye0
- Direction
- reducinge0
- Comparator
- multiple insecticide sprayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All Bt hybrids were more effective at reducing fall armyworm infestation rates and leaf injury than multiple insecticide sprays, and no Bt hybrid reached the lowest infestation threshold (20%) to require supplemental insecticide treatments, despite infestations in non-Bt corn reaching >68% in each year.”
t0“corn”
Claim · model-written summary
No Bt hybrid reached the 20% infestation threshold for supplemental insecticide.
- Taxon
- cornZea mays subsp. mayse0
- Material
- Bt hybride0
- Interactor
- fall armywormSpodoptera frugiperdat0pest
- Outcome
- infestation thresholde0
- Value
- 20%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no Bt hybrid reached the lowest infestation threshold (20%) to require supplemental insecticide treatments, despite infestations in non-Bt corn reaching >68% in each year.”
t0“fall armyworm”
Claim · model-written summary
Non-Bt corn infestations exceeded 68% in each year.
- Taxon
- cornZea mays subsp. mayse0
- Material
- non-Bt corne0
- Interactor
- fall armywormSpodoptera frugiperdat0pest
- Outcome
- infestationse0
- Value
- >68%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infestations in non-Bt corn reaching >68% in each year.”
t0“fall armyworm”
Claim · model-written summary
The Vip3A Bt hybrid alone significantly reduced ear feeding.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Bt hybrid pyramid producing Vip3Ae0
- Interactor
- Helicoverpa zea
.jpg?width=60)
Helicoverpa zeae0pest - Outcome
- ear feedinge0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The only Bt and/or insecticide treatment to significantly reduce ear feeding or the proportion of ears injured (mainly by Helicoverpa zea [Boddie]) was the Bt hybrid pyramid producing Vip3A.”
t0“corn”
Claim · model-written summary
The Vip3A Bt hybrid alone significantly reduced the proportion of injured ears.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Bt hybrid pyramid producing Vip3Ae0
- Interactor
- Helicoverpa zeaHelicoverpa zeae0pest
- Outcome
- proportion of ears injurede0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The only Bt and/or insecticide treatment to significantly reduce ear feeding or the proportion of ears injured (mainly by Helicoverpa zea [Boddie]) was the Bt hybrid pyramid producing Vip3A.”
t0“corn”
Claim · model-written summary
Only corn Bt hybrids producing Cry1A.105 plus Cry2Ab2 significantly protected yield.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Bt hybrids producing Cry1A.105 + Cry2Ab2e0
- Interactor
- fall armywormSpodoptera frugiperdat0pest
- Outcome
- yielde0
- Direction
- protectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, significant protection of yield was detected only in the Bt hybrids producing Cry1A.105 + Cry2Ab2.”
t0“Corn for Management of Fall Armyworm”
The same questions in other papers
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- negative
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17 papers in the same direction as this paper · 1 in the opposite direction · 3 reporting no difference from an alternative
- positive
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See all 22 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.