Abstract
Abstract Waterhemp control in Ontario has increased in complexity due to the evolution of biotypes that are resistant to five herbicide modes of action (Groups 2, 5, 9, 14, and 27 as categorized by the Weed Science Society of America). Four field trials were carried out over a 2-yr period in 2021 and 2022 to assess the control of multiple-herbicide-resistant (MHR) waterhemp biotypes in glyphosate/glufosinate/2,4-D-resistant (GG2R) soybean using one- and two-pass herbicide programs. S -metolachlor/metribuzin, pyroxasulfone/sulfentrazone, pyroxasulfone/flumioxazin, and pyroxasulfone + metribuzin applied preemergence (PRE) controlled MHR waterhemp similarly by 46%, 63%, 60%, and 69%, respectively, at 8 wk after postemergence (POST) application (WAA-B). A one-pass application of 2,4-D choline/glyphosate DMA POST provided greater control of MHR waterhemp than glufosinate. Two-pass herbicide programs of a PRE herbicide followed by (fb) a POST-applied herbicide resulted in greater MHR waterhemp control compared to a single PRE or POST herbicide application. PRE herbicides fb glufosinate or 2,4-D choline/glyphosate DMA POST controlled MHR waterhemp by 74% to 91% and by 84% to 96%, respectively, at 8 WAA-B. Two-pass herbicide applications of an effective PRE residual herbicide fb 2,4-D choline/glyphosate DMA POST in GG2R soybean can effectively manage waterhemp that is resistant to herbicides in Groups 2, 5, 9, 14, and 27.
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Claims 9
Claim · model-written summary
Preemergence S-metolachlor/metribuzin controlled MHR waterhemp by 46%.
- Taxon
- soybean
Glycine maxt0 - Treatment
- S -metolachlor/metribuzine0
- Interactor
- waterhempe0weed
- Outcome
- MHR waterhempe0
- Direction
- controllede0
- Value
- 46%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S -metolachlor/metribuzin, pyroxasulfone/sulfentrazone, pyroxasulfone/flumioxazin, and pyroxasulfone + metribuzin applied preemergence (PRE) controlled MHR waterhemp similarly by 46%, 63%, 60%, and 69%, respectively, at 8 wk after postemergence (POST) application (WAA-B).”
t0“soybean”
Claim · model-written summary
Preemergence pyroxasulfone/sulfentrazone controlled MHR waterhemp by 63%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- pyroxasulfone/sulfentrazonee0
- Interactor
- waterhempe0weed
- Outcome
- MHR waterhempe0
- Direction
- controllede0
- Value
- 63%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S -metolachlor/metribuzin, pyroxasulfone/sulfentrazone, pyroxasulfone/flumioxazin, and pyroxasulfone + metribuzin applied preemergence (PRE) controlled MHR waterhemp similarly by 46%, 63%, 60%, and 69%, respectively, at 8 wk after postemergence (POST) application (WAA-B).”
t0“soybean”
Claim · model-written summary
Preemergence pyroxasulfone/flumioxazin controlled MHR waterhemp by 60%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- pyroxasulfone/flumioxazine0
- Interactor
- waterhempe0weed
- Outcome
- MHR waterhempe0
- Direction
- controllede0
- Value
- 60%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S -metolachlor/metribuzin, pyroxasulfone/sulfentrazone, pyroxasulfone/flumioxazin, and pyroxasulfone + metribuzin applied preemergence (PRE) controlled MHR waterhemp similarly by 46%, 63%, 60%, and 69%, respectively, at 8 wk after postemergence (POST) application (WAA-B).”
t0“soybean”
Claim · model-written summary
Preemergence pyroxasulfone plus metribuzin controlled MHR waterhemp by 69%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- pyroxasulfone + metribuzine0
- Interactor
- waterhempe0weed
- Outcome
- MHR waterhempe0
- Direction
- controllede0
- Value
- 69%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S -metolachlor/metribuzin, pyroxasulfone/sulfentrazone, pyroxasulfone/flumioxazin, and pyroxasulfone + metribuzin applied preemergence (PRE) controlled MHR waterhemp similarly by 46%, 63%, 60%, and 69%, respectively, at 8 wk after postemergence (POST) application (WAA-B).”
t0“soybean”
Claim · model-written summary
Postemergence 2,4-D choline/glyphosate DMA controlled MHR waterhemp better than glufosinate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 2,4-D choline/glyphosate DMA POSTe0
- Interactor
- waterhempe0weed
- Outcome
- control of MHR waterhempe0
- Direction
- greatere0
- Comparator
- glufosinatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A one-pass application of 2,4-D choline/glyphosate DMA POST provided greater control of MHR waterhemp than glufosinate.”
t0“soybean”
Claim · model-written summary
Two-pass programs controlled MHR waterhemp better than a single PRE or POST application.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Two-pass herbicide programse0
- Interactor
- waterhempe0weed
- Outcome
- MHR waterhemp controle0
- Direction
- greatere0
- Comparator
- a single PRE or POST herbicide applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two-pass herbicide programs of a PRE herbicide followed by (fb) a POST-applied herbicide resulted in greater MHR waterhemp control compared to a single PRE or POST herbicide application.”
t0“soybean”
Claim · model-written summary
PRE followed by glufosinate controlled MHR waterhemp by 74% to 91%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- PRE herbicides fb glufosinatee0
- Interactor
- waterhempe0weed
- Outcome
- MHR waterhempe0
- Direction
- controllede0
- Value
- 74% to 91%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRE herbicides fb glufosinate or 2,4-D choline/glyphosate DMA POST controlled MHR waterhemp by 74% to 91% and by 84% to 96%, respectively, at 8 WAA-B.”
t0“soybean”
Claim · model-written summary
PRE followed by 2,4-D choline/glyphosate DMA controlled MHR waterhemp by 84% to 96%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 2,4-D choline/glyphosate DMA POSTe0
- Interactor
- waterhempe0weed
- Outcome
- MHR waterhempe0
- Direction
- controllede0
- Value
- 84% to 96%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRE herbicides fb glufosinate or 2,4-D choline/glyphosate DMA POST controlled MHR waterhemp by 74% to 91% and by 84% to 96%, respectively, at 8 WAA-B.”
t0“soybean”
Claim · model-written summary
The authors recommend effective PRE residual herbicide followed by 2,4-D choline/glyphosate DMA POST for resistant waterhemp.
- Taxon
- soybeanGlycine maxe0
- Interactor
- waterhempe0weed
- Outcome
- effectively manage waterhempe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two-pass herbicide applications of an effective PRE residual herbicide fb 2,4-D choline/glyphosate DMA POST in GG2R soybean can effectively manage waterhemp that is resistant to herbicides in Groups 2, 5, 9, 14, and 27.”
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See all 123 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.