Abstract
Field studies were conducted in 2008 in Ontario, OR and Paterson, WA to determine the effect of simulated glyphosate drift on ‘Ranger Russet’ potato, including visual injury, shikimic acid accumulation, and tuber yield. Glyphosate was applied at 8.5, 54, 107, 215, and 423 g ae ha −1 ; which corresponds to 0.01, 0.064, 0.126, 0.254, and 0.5 of the lowest recommended (846 g ha −1 ) single application dose for glyphosate-resistant corn and sugar beet. Glyphosate was applied when potato plants were at 10-cm height, stolon hooking, tuber initiation, or bulking stage. The greatest visual foliar injury was observed when glyphosate was applied at a dose of 54 g ha −1 or greater and potato plants were at the hooking stage. The lowest foliar injury was observed when glyphosate was applied to potato plants at the bulking stage. The I 50 glyphosate dose at 42 d after treatment (DAT) was estimated to be 167 g ha −1 for potatoes sprayed at the hooking stage. The corresponding glyphosate dose to result in 50% injury for potatoes sprayed at tuber initiation, 10-cm height, and bulking stages were 129%, 338%, and 438%, respectively, greater than hooking stage. The U.S. No.1 potato yield was inversely related to vine injury and shikimic acid accumulation. Shikimic acid accumulation increased when glyphosate was applied at 107 g ha −1 or greater. U.S. No.1 potato yield was reduced by 46% and 84% relative to the untreated control (55 and 76 T/ha) when glyphosate was applied at 107 g ha −1 to plants in the hooking stage at Ontario and Paterson, respectively. Tuber yields at both sites were lowest when glyphosate was applied at hooking and tuber initiation stages.
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Claims 12
Claim · model-written summary
Foliar injury was greatest at hooking after doses of at least 54 g ha −1.
- Taxon
- Potato
Solanum tuberosumt0 - Organ / stage
- hooking stagee0
- Treatment
- glyphosatee0
- Outcome
- visual foliar injurye0
- Direction
- greateste0
- Value
- 54 g ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greatest visual foliar injury was observed when glyphosate was applied at a dose of 54 g ha −1 or greater and potato plants were at the hooking stage.”
t0“Potato”
Claim · model-written summary
Foliar injury was lowest when glyphosate was applied during bulking.
- Taxon
- potato plantsSolanum tuberosume0
- Organ / stage
- bulking stagee0
- Treatment
- glyphosatee0
- Outcome
- foliar injurye0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest foliar injury was observed when glyphosate was applied to potato plants at the bulking stage.”
Claim · model-written summary
The glyphosate I 50 dose at 42 DAT was 167 g ha −1 for hooking-stage potatoes.
- Taxon
- potatoesSolanum tuberosume0
- Organ / stage
- hooking stagee0
- Outcome
- I 50 glyphosate dosee0
- Value
- 167 g ha −1e0
- Qualifier
- 42 d after treatment (DAT)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The I 50 glyphosate dose at 42 d after treatment (DAT) was estimated to be 167 g ha −1 for potatoes sprayed at the hooking stage.”
Claim · model-written summary
The 50% injury dose at tuber initiation was 129% greater than at hooking.
- Taxon
- potatoesSolanum tuberosume0
- Organ / stage
- tuber initiatione0
- Outcome
- glyphosate dose to result in 50% injurye0
- Direction
- greatere0
- Value
- 129%e0
- Comparator
- hooking stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The corresponding glyphosate dose to result in 50% injury for potatoes sprayed at tuber initiation, 10-cm height, and bulking stages were 129%, 338%, and 438%, respectively, greater than hooking stage.”
Claim · model-written summary
The 50% injury dose at 10-cm height was 338% greater than at hooking.
- Taxon
- potatoesSolanum tuberosume0
- Organ / stage
- 10-cm heighte0
- Outcome
- glyphosate dose to result in 50% injurye0
- Direction
- greatere0
- Value
- 338%e0
- Comparator
- hooking stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The corresponding glyphosate dose to result in 50% injury for potatoes sprayed at tuber initiation, 10-cm height, and bulking stages were 129%, 338%, and 438%, respectively, greater than hooking stage.”
Claim · model-written summary
The 50% injury dose at bulking stages was 438% greater than at hooking.
- Taxon
- potatoesSolanum tuberosume0
- Organ / stage
- bulking stagese0
- Outcome
- glyphosate dose to result in 50% injurye0
- Direction
- greatere0
- Value
- 438%e0
- Comparator
- hooking stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The corresponding glyphosate dose to result in 50% injury for potatoes sprayed at tuber initiation, 10-cm height, and bulking stages were 129%, 338%, and 438%, respectively, greater than hooking stage.”
Claim · model-written summary
U.S. No.1 yield declined as vine injury increased.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- vinee0
- Outcome
- U.S. No.1 potato yielde0
- Direction
- inverselye0
- Qualifier
- vine injurye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The U.S. No.1 potato yield was inversely related to vine injury and shikimic acid accumulation.”
Claim · model-written summary
U.S. No.1 yield declined as shikimic acid accumulated.
- Taxon
- potatoSolanum tuberosume0
- Compound
- shikimic acide0
- Outcome
- U.S. No.1 potato yielde0
- Direction
- inverselye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The U.S. No.1 potato yield was inversely related to vine injury and shikimic acid accumulation.”
Claim · model-written summary
Shikimic acid accumulation rose at glyphosate doses of at least 107 g ha −1.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- glyphosatee0
- Outcome
- Shikimic acid accumulatione0
- Direction
- increasede0
- Value
- 107 g ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shikimic acid accumulation increased when glyphosate was applied at 107 g ha −1 or greater.”
t0“Potato”
Claim · model-written summary
Hooking-stage treatment at 107 g ha −1 reduced U.S. No.1 yield by 46% at Ontario.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- hooking stagee0
- Treatment
- glyphosate was applied at 107 g ha −1e0
- Outcome
- U.S. No.1 potato yielde0
- Direction
- reducede0
- Value
- 46%e0
- Comparator
- untreated controle0
- Setting
- Ontarioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“U.S. No.1 potato yield was reduced by 46% and 84% relative to the untreated control (55 and 76 T/ha) when glyphosate was applied at 107 g ha −1 to plants in the hooking stage at Ontario and Paterson, respectively.”
Claim · model-written summary
Hooking-stage treatment at 107 g ha −1 reduced U.S. No.1 yield by 84% at Paterson.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- hooking stagee0
- Treatment
- glyphosate was applied at 107 g ha −1e0
- Outcome
- U.S. No.1 potato yielde0
- Direction
- reducede0
- Value
- 84%e0
- Comparator
- untreated controle0
- Setting
- Patersone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“U.S. No.1 potato yield was reduced by 46% and 84% relative to the untreated control (55 and 76 T/ha) when glyphosate was applied at 107 g ha −1 to plants in the hooking stage at Ontario and Paterson, respectively.”
Claim · model-written summary
Tuber yields were lowest after glyphosate treatment at hooking and tuber initiation.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- hooking and tuber initiation stagese0
- Treatment
- glyphosatee0
- Outcome
- Tuber yieldse0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber yields at both sites were lowest when glyphosate was applied at hooking and tuber initiation stages.”
t0“Potato”
The same questions in other papers
glyphosate · yield · Solanum tuberosum (potato)Results differ
7 papers in the same direction as this paper · 4 in the opposite direction
- negative
- no effect
- negative
8 papers more in this group
See all 12 papers →glyphosate · crop injury · Solanum tuberosum (potato)Positive and negative results
2 in the opposite direction
- negative
- no effect
glyphosate · molecular: metabolites · Solanum tuberosum (potato)Results agree
2 papers in the same direction as this paper
- no effect
- no effect
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.