Abstract
Glyphosate-resistant (GR) waterhemp was first discovered in Ontario, Canada, in 2014. In Ontario, GR waterhemp interference in previous studies reduced soybean yield up to 73%. Tank-mixes of herbicides with multiple modes-of-action are important for delaying the evolution of herbicide resistance. The objective of this study was to evaluate the efficacy of pyroxasulfone (150 g a.i. ha −1 ), S-metolachlor/metribuzin (1943 g a.i. ha −1 ), pyroxasulfone/sulfentrazone (300 g a.i. ha −1 ), and pyroxasulfone/flumioxazin (240 g a.i. ha −1 ) applied preemergence (PRE) with and without the addition of glyphosate/dicamba (1800 g a.e. ha −1 ) for the control of GR waterhemp in soybean. At 8 wk after treatment application (WAA), glyphosate/dicamba applied PRE controlled GR waterhemp 45%. Pyroxasulfone, S-metolachlor/metribuzin, pyroxasulfone/sulfentrazone, and pyroxasulfone/flumioxazin applied PRE controlled GR waterhemp 79%, 87%, 91%, and 95%, respectively. At 2, 4, 8, and 12 WAA, the addition of glyphosate/dicamba to the aforementioned PRE herbicides did not improve GR waterhemp control. There was no increase in GR waterhemp control with the addition glyphosate/dicamba; however, multiple herbicide modes-of-action should be utilized to reduce the selection intensity for herbicide-resistant weeds.
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Claims 7
Claim · model-written summary
Preemergence glyphosate/dicamba controlled resistant waterhemp 45% at 8 weeks.
- Taxon
- soybean
Glycine maxt0 - Treatment
- glyphosate/dicamba applied PREe0
- Interactor
- GR waterhempe0weed
- Outcome
- GR waterhempe0
- Direction
- controllede0
- Value
- 45%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 8 wk after treatment application (WAA), glyphosate/dicamba applied PRE controlled GR waterhemp 45%”
t0“soybean”
Claim · model-written summary
Preemergence pyroxasulfone controlled resistant waterhemp 79% at 8 weeks.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Pyroxasulfonee0
- Interactor
- GR waterhempe0weed
- Outcome
- GR waterhempe0
- Direction
- controllede0
- Value
- 79%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pyroxasulfone, S-metolachlor/metribuzin, pyroxasulfone/sulfentrazone, and pyroxasulfone/flumioxazin applied PRE controlled GR waterhemp 79%, 87%, 91%, and 95%, respectively”
t0“soybean”
Claim · model-written summary
Preemergence S-metolachlor/metribuzin controlled resistant waterhemp 87% at 8 weeks.
- Taxon
- soybeanGlycine maxt0
- Treatment
- S-metolachlor/metribuzine0
- Interactor
- GR waterhempe0weed
- Outcome
- GR waterhempe0
- Direction
- controllede0
- Value
- 87%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pyroxasulfone, S-metolachlor/metribuzin, pyroxasulfone/sulfentrazone, and pyroxasulfone/flumioxazin applied PRE controlled GR waterhemp 79%, 87%, 91%, and 95%, respectively”
t0“soybean”
Claim · model-written summary
Preemergence pyroxasulfone/sulfentrazone controlled resistant waterhemp 91% at 8 weeks.
- Taxon
- soybeanGlycine maxt0
- Treatment
- pyroxasulfone/sulfentrazonee0
- Interactor
- GR waterhempe0weed
- Outcome
- GR waterhempe0
- Direction
- controllede0
- Value
- 91%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pyroxasulfone, S-metolachlor/metribuzin, pyroxasulfone/sulfentrazone, and pyroxasulfone/flumioxazin applied PRE controlled GR waterhemp 79%, 87%, 91%, and 95%, respectively”
t0“soybean”
Claim · model-written summary
Preemergence pyroxasulfone/flumioxazin controlled resistant waterhemp 95% at 8 weeks.
- Taxon
- soybeanGlycine maxt0
- Treatment
- pyroxasulfone/flumioxazine0
- Interactor
- GR waterhempe0weed
- Outcome
- GR waterhempe0
- Direction
- controllede0
- Value
- 95%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pyroxasulfone, S-metolachlor/metribuzin, pyroxasulfone/sulfentrazone, and pyroxasulfone/flumioxazin applied PRE controlled GR waterhemp 79%, 87%, 91%, and 95%, respectively”
t0“soybean”
Claim · model-written summary
Adding glyphosate/dicamba to the preemergence herbicides did not improve waterhemp control at 2, 4, 8 or 12 weeks.
- Taxon
- soybeanGlycine maxt0
- Treatment
- addition of glyphosate/dicambae0
- Interactor
- GR waterhempe0weed
- Outcome
- GR waterhemp controle0
- Direction
- did not improvee0
- Comparator
- aforementioned PRE herbicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 2, 4, 8, and 12 WAA, the addition of glyphosate/dicamba to the aforementioned PRE herbicides did not improve GR waterhemp control”
t0“soybean”
Claim · model-written summary
The authors recommend multiple herbicide modes of action to reduce selection for resistant weeds.
- Taxon
- soybeanGlycine maxt0
- Interactor
- herbicide-resistant weedse0weed
- Outcome
- multiple herbicide modes-of-action should be utilizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“multiple herbicide modes-of-action should be utilized to reduce the selection intensity for herbicide-resistant weeds”
t0“soybean”
The same questions in other papers
dicamba · control · Glycine max (soybean)Positive and negative results
3 papers in the same direction as this paper · 27 reporting no difference from an alternative
- positive
- no effect
- positive
27 papers more in this group
See all 31 papers →glyphosate · control · Glycine max (soybean)Positive and negative results
5 papers in the same direction as this paper · 70 reporting no difference from an alternative
- positive
- positive
- negative
72 papers more in this group
See all 76 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.