Abstract
Glyphosate-resistant (GR) weeds are most challenging for growers to control in cotton in the midsouth region of the United States. As a result, growers in these states are transitioning from a glyphosate-based system to a glufosinate-based system. A field study was conducted in 2010 and 2011 in Georgia, North Carolina, and Tennessee to determine the effect of repeated glufosinate applications to WideStrike cotton applied at various application timings. One to three glufosinate applications at 594 g ai ha −1 were applied to cotton at the two-leaf, seven-leaf, bloom, or 2 wk after bloom stages. Visual estimates of crop injury were evaluated after each application, in addition to crop height, development, and yield. Crop injury after each glufosinate application typically ranged from 3 to 11%, with higher injury observed where multiple glufosinate applications were made. Crop height differences were noted after the bloom and 2 wk after bloom applications. Treatments that had one, two, or three glufosinate applications had reduced crop height when compared with the weed-free control. Node above cracked boll ratings also indicated that glufosinate treatments may have stressed the cotton. Ultimately, yield was reduced where three glufosinate treatments were applied to WideStrike cotton. In addition, one glufosinate application at the bloom stage or two glufosinate applications at the bloom and 2 wk after bloom stages reduced yield when compared with the weed-free control. Although it is a legal application, growers should use caution when applying glufosinate to WideStrike cotton because the manufacturer of glufosinate and the manufacturer of WideStrike cotton do not recommend this application. However, where GR Palmer amaranth is present, these applications may be necessary.
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Claims 12
Claim · model-written summary
Glufosinate applications caused 3 to 11% crop injury.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- glufosinate applicatione0
- Outcome
- Crop injurye0
- Direction
- highere0
- Value
- 3 to 11%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop injury after each glufosinate application typically ranged from 3 to 11%, with higher injury observed where multiple glufosinate applications were made.”
t0“WideStrike Cotton”
Claim · model-written summary
Multiple glufosinate applications caused higher injury.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- multiple glufosinate applicationse0
- Outcome
- injurye0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher injury observed where multiple glufosinate applications were made.”
t0“WideStrike Cotton”
Claim · model-written summary
Applications at bloom and two weeks later produced crop height differences.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- bloom and 2 wk after bloom applicationse0
- Outcome
- Crop height differencese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop height differences were noted after the bloom and 2 wk after bloom applications.”
t0“WideStrike Cotton”
Claim · model-written summary
One glufosinate application reduced crop height against weed-free control.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- onee0
- Outcome
- crop heighte0
- Direction
- reducede0
- Comparator
- weed-free controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments that had one, two, or three glufosinate applications had reduced crop height when compared with the weed-free control.”
t0“WideStrike Cotton”
Claim · model-written summary
Two glufosinate applications reduced crop height against weed-free control.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- twoe0
- Outcome
- crop heighte0
- Direction
- reducede0
- Comparator
- weed-free controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments that had one, two, or three glufosinate applications had reduced crop height when compared with the weed-free control.”
t0“WideStrike Cotton”
Claim · model-written summary
Three glufosinate applications reduced crop height against weed-free control.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- three glufosinate applicationse0
- Outcome
- crop heighte0
- Direction
- reducede0
- Comparator
- weed-free controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments that had one, two, or three glufosinate applications had reduced crop height when compared with the weed-free control.”
t0“WideStrike Cotton”
Claim · model-written summary
Node above cracked boll ratings suggested glufosinate stress.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- glufosinate treatmentse0
- Outcome
- stressed the cottone0
- Qualifier
- may havee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Node above cracked boll ratings also indicated that glufosinate treatments may have stressed the cotton.”
Claim · model-written summary
Three glufosinate treatments reduced WideStrike cotton yield.
Not reportedComparator
Verbatim
e0“yield was reduced where three glufosinate treatments were applied to WideStrike cotton.”
Claim · model-written summary
One bloom-stage glufosinate application reduced yield against weed-free control.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- one glufosinate application at the bloom stagee0
- Outcome
- yielde0
- Direction
- reducede0
- Comparator
- weed-free controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one glufosinate application at the bloom stage or two glufosinate applications at the bloom and 2 wk after bloom stages reduced yield when compared with the weed-free control.”
t0“WideStrike Cotton”
Claim · model-written summary
Two glufosinate applications at bloom and two weeks afterward reduced yield against weed-free control.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- two glufosinate applications at the bloom and 2 wk after bloom stagese0
- Outcome
- yielde0
- Direction
- reducede0
- Comparator
- weed-free controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two glufosinate applications at the bloom and 2 wk after bloom stages reduced yield when compared with the weed-free control.”
t0“WideStrike Cotton”
Claim · model-written summary
The authors recommend caution applying glufosinate to WideStrike cotton.
Verbatim
e0“growers should use caution when applying glufosinate to WideStrike cotton”
Claim · model-written summary
Applications may be needed where glyphosate-resistant Palmer amaranth occurs.
- Taxon
- CottonGossypium hirsutumt0
- Interactor
- GR Palmer amaranthe0weed
- Outcome
- these applications may be necessarye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“where GR Palmer amaranth is present, these applications may be necessary.”
t0“WideStrike Cotton”
The same questions in other papers
glufosinate · growth · Gossypium hirsutum (cotton)Results differ
5 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
4 papers more in this group
See all 8 papers →glufosinate · crop injury · Gossypium hirsutum (cotton)Results differ
13 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- negative
12 papers more in this group
See all 16 papers →glufosinate · yield · Gossypium hirsutum (cotton)Results differ
9 papers in the same direction as this paper · 8 in the opposite direction
- no effect
- no effect
- positive
14 papers more in this group
See all 18 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.