Abstract
Kochia, common lambsquarters, and wild buckwheat are major problem weeds in glyphosate-resistant corn production in the northern Great Plains of the United States. Field research was conducted in 2011 and 2012 near Huntley, MT to investigate effective PRE herbicides applied alone or in premixes with or without tank-mixed pendimethalin for extended in-season residual control of the selected broadleaf weeds in glyphosate-resistant corn. Control of kochia, common lambsquarters, and wild buckwheat with recently registered herbicide premixes, including saflufenacil + dimethenamid-P and S -metolachlor + mesotrione, was as high as 95 and 90% at 21 and 63 d after treatment (DAT), and mostly similar to the standard atrazine treatment. Residual control of common lambsquarters and wild buckwheat from pyroxasulfone was higher at 298 compared with 149 g ai ha −1 rate. Pyroxasulfone and other chloroacetamide herbicides (acetochlor or dimethenamid-P) applied alone failed to provide greater than 79, 70, and 54% residual control at 21, 35, and 63 DAT, respectively, of the weed species investigated. Residual weed control throughout the growing season was significantly improved with the addition of pendimethalin to pyroxasulfone (149 g ha −1 ), acetochlor, or dimethenamid-P when compared with any of the three herbicides applied alone. Kochia control by pyroxasulfone, acetochlor, or dimethenamid-P tank mixed with pendimethalin was as high as 94, 92, and 81% at 21, 35, and 63 DAT, respectively. Control of common lambsquarters with the addition of pendimethalin to pyroxasulfone or acetochlor was improved to 94, 89, and 81% at 21, 35, and 63 DAT, respectively. Similarly, wild buckwheat control with acetochlor plus pendimethalin was improved to 87, 85, and 82% at 21, 35, and 63 DAT, respectively. Consistent with the extended in-season (up to 9 wk) residual weed control, pyroxasulfone, acetochlor, or dimethenamid-P treatments when tank mixed with pendimethalin had higher corn yields compared with the herbicides applied alone. The investigation on residual herbicides that provide extended in-season weed control should be continued as an important aspect of glyphosate stewardship and to mitigate the occurrence of glyphosate-resistant weed populations in grower fields.
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Claims 8
Claim · model-written summary
Recently registered herbicide premixes controlled kochia, common lambsquarters and wild buckwheat as high as 95 and 90%, mostly similar to atrazine.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- recently registered herbicide premixese1
- Second interactor
- common lambsquarters
Chenopodium albume1weed - Outcome
- Control of kochia, common lambsquarters, and wild buckwheate1
- Direction
- mostly similare2
- Value
- 95 and 90%e2
- Comparator
- standard atrazine treatmente2
BassiaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major problem weeds in glyphosate-resistant corn production”
e1“Control of kochia, common lambsquarters, and wild buckwheat with recently registered herbicide premixes”
e2“was as high as 95 and 90% at 21 and 63 d after treatment (DAT), and mostly similar to the standard atrazine treatment”
Claim · model-written summary
Pyroxasulfone residual control of common lambsquarters and wild buckwheat was higher at 298 than at 149 g ai ha −1.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- pyroxasulfonee1
- Interactor
- common lambsquartersChenopodium albume1weed
- Second interactor
- wild buckwheat
Fallopia convolvuluse1weed - Outcome
- Residual controle1
- Direction
- highere1
- Comparator
- 149 g ai ha −1 ratee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major problem weeds in glyphosate-resistant corn production”
e1“Residual control of common lambsquarters and wild buckwheat from pyroxasulfone was higher at 298 compared with 149 g ai ha −1 rate”
Claim · model-written summary
Pyroxasulfone and other chloroacetamide herbicides applied alone failed to provide residual control greater than 79, 70 and 54%.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Pyroxasulfone and other chloroacetamide herbicidese2
- Interactor
- weed speciese2weed
- Outcome
- residual controle2
- Direction
- failed to provide greater thane2
- Value
- 79, 70, and 54%e2
- Qualifier
- applied alonee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major problem weeds in glyphosate-resistant corn production”
e2“Pyroxasulfone and other chloroacetamide herbicides (acetochlor or dimethenamid-P) applied alone failed to provide greater than 79, 70, and 54% residual control at 21, 35, and 63 DAT, respectively, of the weed species investigated”
Claim · model-written summary
Adding pendimethalin to pyroxasulfone, acetochlor or dimethenamid-P significantly improved residual weed control compared with those herbicides alone.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- addition of pendimethaline3
- Outcome
- Residual weed controle3
- Direction
- improvede3
- Qualifier
- throughout the growing seasone3
- Comparator
- any of the three herbicides applied alonee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major problem weeds in glyphosate-resistant corn production”
e3“Residual weed control throughout the growing season was significantly improved with the addition of pendimethalin to pyroxasulfone (149 g ha −1 ), acetochlor, or dimethenamid-P when compared with any of the three herbicides applied alone”
Claim · model-written summary
Kochia control by pyroxasulfone, acetochlor or dimethenamid-P tank mixed with pendimethalin was as high as 94, 92 and 81% at 21, 35 and 63 DAT.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- tank mixed with pendimethaline4
- Outcome
- Kochia controle4
- Direction
- higherinferrede4
- Value
- 94, 92, and 81%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major problem weeds in glyphosate-resistant corn production”
e4“Kochia control by pyroxasulfone, acetochlor, or dimethenamid-P tank mixed with pendimethalin was as high as 94, 92, and 81% at 21, 35, and 63 DAT”
Claim · model-written summary
Adding pendimethalin to pyroxasulfone or acetochlor improved common lambsquarters control to 94, 89 and 81%.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- addition of pendimethalin to pyroxasulfone or acetochlore5
- Interactor
- common lambsquartersChenopodium albume5weed
- Outcome
- Control of common lambsquarterse5
- Direction
- improvede5
- Value
- 94, 89, and 81%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major problem weeds in glyphosate-resistant corn production”
e5“Control of common lambsquarters with the addition of pendimethalin to pyroxasulfone or acetochlor was improved to 94, 89, and 81% at 21, 35, and 63 DAT”
Claim · model-written summary
Acetochlor plus pendimethalin improved wild buckwheat control to 87, 85 and 82%.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- acetochlor plus pendimethaline6
- Interactor
- wild buckwheatFallopia convolvuluse6weed
- Outcome
- wild buckwheat controle6
- Direction
- improvede6
- Value
- 87, 85, and 82%e6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major problem weeds in glyphosate-resistant corn production”
e6“wild buckwheat control with acetochlor plus pendimethalin was improved to 87, 85, and 82% at 21, 35, and 63 DAT”
Claim · model-written summary
Herbicides tank mixed with pendimethalin had higher corn yields than herbicides applied alone.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- tank mixed with pendimethaline0
- Outcome
- corn yieldse0
- Direction
- highere0
- Comparator
- the herbicides applied alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pyroxasulfone, acetochlor, or dimethenamid-P treatments when tank mixed with pendimethalin had higher corn yields compared with the herbicides applied alone”
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