Control of Glyphosate-Resistant Horseweed (<i>Conyza canadensis</i>) with Dicamba Applied Preplant and Postemergence in Dicamba-Resistant Soybean

Byker, Holly P.; Soltani, Nader; Robinson, Darren E.; Tardif, François J.; Lawton, Mark B.; Sikkema, Peter H.

doi:10.1614/wt-d-13-00023.1

Cited by 63 publications

(80 citation statements)

References 22 publications

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“…These results were generally consistent with previous studies from our research group which demonstrated that GR Canada fleabane control can vary. For example, Byker et al (2013b) reported control 4 WAT as low as 62% with glyphosate + 2,4-D (900 + 560 g ai ha −1 ); but in a related study, Byker et al (2013a) found that control with glyphosate + 2,4-D (900 + 500 g ai ha −1 ) ranged from 78% to 92% at 4 WAT. Ford et al (2014), recently reported that Canada fleabane demonstrated varying levels of 2,4-D tolerance, which could explain this range in control.…”

Section: Resultsmentioning

confidence: 97%

Herbicide tank mixtures to control co-existing glyphosate-resistant Canada fleabane and giant ragweed in soybean

Mahoney¹,

McNaughton²,

Sikkema³

2016

Can. J. Plant Sci.

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Populations of glyphosate-resistant (GR) Canada fleabane and GR giant ragweed can be found in several locations in southwestern Ontario. While these species can be managed individually, a scenario has developed where both species are present in GR soybean. Ten separate field experiments (five with Canada fleabane and five with giant ragweed) were conducted over a 2-yr period (2013)(2014) in soybean to evaluate preplant (PP) herbicide tank mixtures that could control both weed species if they were present in the same field. Herbicides were rated for soybean injury, weed control, population density, and aboveground biomass. Two-and three-way tank mixtures containing amitrole (i.e., glyphosate + amitrole, glyphosate + amitrole + saflufenacil, and glyphosate + amitrole + 2,4-D) were among the most effective treatments. For example, control of GR Canada fleabane and GR giant ragweed was at least 92% at 4 wk after treatment (WAT) and weed density and biomass were generally similar to the weed-free control. However, without amitrole, the best PP herbicide option was a three-way tank mixture of glyphosate + saflufenacil + 2,4-D which provided improved control and greater reductions in density and biomass compared with the two-way glyphosate tank mixtures containing saflufenacil or 2,4-D.Key words: glyphosate resistance, soybean [Glycine max (L.) Merr.], weed control.Résumé : On trouve des peuplements de vergerette du Canada et de grande herbe à poux résistants au glyphosate (RG) à plusieurs endroits dans le sud-ouest de l'Ontario. Bien que l'on puisse combattre ces espèces séparément, il arrive que les deux se retrouvent dans des champs de soja RG. Les auteurs ont entrepris dix expériences sur le terrain (cinq avec la vergerette du Canada et autant avec la grande herbe à poux) au cours d'une période de deux ans (2013, 2014), dans des cultures de soja, afin d'évaluer des mélanges d'herbicides de présemis susceptibles de lutter contre les deux adventices quand elles infestent le même champ. Les herbicides ont été cotés d'après les dommages causés à la culture, la destruction des mauvaises herbes, la densité du peuplement et la biomasse aérienne. Les mélanges à deux et à trois voies contenant de l'amitrole (à savoir, glyphosate + amitrole, glyphosate + amitrole + saflufénacil et glyphosate + amitrole + 2,4-D) figurent parmi les plus efficaces. Ainsi, au moins 92 % de la vergerette du Canada RG et de la grande herbe à poux RG avaient été détruites, quatre semaines après le traitement, et la densité du peuplement de même que la biomasse aérienne des adventices étaient généralement semblables à celles observées sur les parcelles témoin désherbées. Sans amitrole cependant, le meilleur herbicide de présemis est un mélange à trois voies composé de glyphosate + saflufénacil + 2,4-D. Il permet une meilleure lutte et une plus grande réduction de la densité de peuplement et de la biomasse aérienne des adventices que les mélanges de glyphosate à deux voies renfermant du saflufénacil ou du 2,4-D. [Traduit par la Rédaction] M...

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Section: Resultsmentioning

confidence: 97%

Herbicide tank mixtures to control co-existing glyphosate-resistant Canada fleabane and giant ragweed in soybean

Mahoney¹,

McNaughton²,

Sikkema³

2016

Can. J. Plant Sci.

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“…As a result, GR Canada fleabane must now be controlled in the major field crops of southern Ontario: corn (Zea mays L.), soybean [Glycine max (L.) Merr. ], and winter wheat (Triticum aestivum L.) (Byker et al 2013a;Ford et al 2014;Mahoney et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Postemergence herbicides for control of glyphosate-resistant Canada fleabane in corn

Mahoney¹,

Shropshire²,

Sikkema³

2016

Can. J. Plant Sci.

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Post-emergence herbicides were evaluated for glyphosate-resistant Canada fleabane control in corn (Zea mays L.) from 2013 to 2015. By 8 wk after treatment, dicamba/atrazine (96% control), dicamba (95% control), bromoxynil + atrazine (93% control), dicamba/diflufenzopyr (90% control), and tembotrione/thiencarbazonemethyl + dicamba (85% control) reduced population density and aboveground biomass to levels equivalent to the weed-free control.

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“…Additionally, biotypes resistant to ALS‐inhibiting and other herbicide modes of action as well as cases of multiple‐herbicide resistance have also been reported (Davis et al, 2009; Heap, 2018; Kruger et al, 2008; Trainer et al, 2005). Researchers have evaluated preplant horseweed control with herbicides (Byker et al, 2013; Chahal and Johnson, 2012; Eubank et al, 2008; Everitt and Keeling, 2007; Flessner et al, 2015; Johnson et al, 2010; Keeling et al, 1989; Kruger et al, 2008, 2010a, 2010b; Moseley and Hagood, 1990; Owen et al, 2009; Steckel et al, 2006) and the results suggest herbicides are most effective when applied to horseweed at the rosette growth stage rather than more mature growth stages. Research also indicated herbicide efficacy is maximized when multiple effective herbicide sites of action are applied, although some antagonism has been observed from paraquat (1,1’‐dimethyl‐4,4’‐bipyridinium ion) + 2,4‐D (2,4‐dichlorophenoxyacetic acid) (Moseley and Hagood, 1990).…”

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Horseweed Control with Preplant Herbicides after Mechanical Injury from Small Grain Harvest

Flessner

Pittman

2019

Agronomy Journal

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Horseweed [Conyza canadensis (L.) Cronquist] plants present during small grains harvest are variable in size, but tall plants are mechanically cut (“topped”) by the combine. Horseweed is best controlled prior to planting double‐cropped soybeans, which must be planted quickly after harvest to preserve yield potential. This urgency eliminates an opportunity for horseweed regrowth, leaving topped plants with reduced leaf area for herbicide spray interception, likely impacting herbicidal control, but little information has been reported in this regard. Horseweed control is further complicated by the prevalence of multiple herbicide‐resistant biotypes. Therefore, field research was conducted to evaluate herbicidal control of glyphosate‐susceptible horseweed that was topped (cut to 46 cm tall) prior to treatment. Additional greenhouse experiments evaluated glyphosate‐resistant horseweed at the rosette and bolt growth stages as well as topped plants prior to treatment. Paraquat alone or in combination with 2,4‐D or dicamba, resulted in 80 to 100% control of topped horseweed across field and greenhouse experiments. In greenhouse experiments, the rosette growth stage was most effectively controlled, followed by the bolt growth stage, which was similar or more effectively controlled, compared with topped horseweed. The authors recommend paraquat with 2,4‐D or dicamba for control of topped horseweed plants, due to efficacy and mixing of multiple effective herbicides. Core Ideas Small grains harvest equipment can cut horseweed, reducing herbicide efficacy. Paraquat containing treatments controlled rosette, bolt, and topped horseweed ≥80%. Dicamba and 2,4‐D controlled rosette stage glyphosate‐resistant horseweed >90%. Authors recommend paraquat with 2,4‐D or dicamba to control topped horseweed.

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Control of Glyphosate-Resistant Horseweed (Conyza canadensis) with Dicamba Applied Preplant and Postemergence in Dicamba-Resistant Soybean

Cited by 63 publications

References 22 publications

Herbicide tank mixtures to control co-existing glyphosate-resistant Canada fleabane and giant ragweed in soybean

Herbicide tank mixtures to control co-existing glyphosate-resistant Canada fleabane and giant ragweed in soybean

Postemergence herbicides for control of glyphosate-resistant Canada fleabane in corn

Horseweed Control with Preplant Herbicides after Mechanical Injury from Small Grain Harvest

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