Preplant and Postemergence Control of Glyphosate-Resistant Giant Ragweed in Corn

Belfry, Kimberly D.; Sikkema, Peter H.

doi:10.4236/as.2015.62026

Cited by 7 publications

(13 citation statements)

References 20 publications

(28 reference statements)

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“…PRE treatments with multiple site‐of‐action herbicides including saflufenacil plus dimethenamid‐ P with or without atrazine were effective for control of A. trifida . Previous studies also reported ≥87% control of glyphosate‐resistant A. trifida with a tank‐mixture of glyphosate, saflufenacil and dimethenamid‐ P (Belfry & Sikkema, ) and 63% control with saflufenacil plus dimethenamid‐ P (Soltani et al ., ) at 28 DAPRE. Recently, Ganie et al .…”

Section: Discussionmentioning

confidence: 80%

An integrated approach to control glyphosate‐resistant Ambrosia trifida with tillage and herbicides in glyphosate‐resistant maize

et al. 2017

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Glyphosate-resistant Ambrosia trifida is a competitive and difficult-to-control annual broad-leaved weed in several agronomic crops in the Midwestern United States and Ontario, Canada. The objectives of this study were to compare treatments for control of glyphosate-resistant A. trifida with tillage followed by pre-emergence (PRE) and/or post-emergence (POST) herbicides in glyphosate-resistant maize and to determine the impact of A. trifida escapes on maize yield. Field experiments were conducted in 2013 and 2014 in grower fields infested with glyphosate-resistant A. trifida. Tillage prior to maize sowing resulted in 80-85% control compared with no tillage. Tillage followed by PRE application of saflufenacil plus dimethenamid-P with or without atrazine resulted in 99% control compared with ≤86 and 96% control with PRE herbicides alone at 7 and 21 days after application respectively. Tillage or POST-only herbicides resulted in 4-14 A. trifida plants m À2 , whereas a PRE and POST programme had <3 plants m À2 . Maize yield was greatest (13.1-14.2 tonnes ha À1 ) with tillage followed by PRE and POST herbicide programme. The relationship between maize yield and late-season density of A. trifida escapes showed a 50% maize yield reduction irrespective of control measures when A. trifida density was 8.4 plants m À2 . It was concluded that the combination of tillage with PRE and/or POST herbicides reduced A. trifida density and biomass accumulation early in the season and provided an integrated approach for effective management.

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Section: Discussionmentioning

confidence: 80%

An integrated approach to control glyphosate‐resistant Ambrosia trifida with tillage and herbicides in glyphosate‐resistant maize

et al. 2017

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“…Dicamba applied alone or tank-mixed with iodosulfuron /thiencarbazone in the fall and early spring resulted in ≥ 81 and ≥ 98% control at 14 and 28 DAEST, respectively (Table 2). Belfry and Sikkema (2015) reported dicamba applied alone or tank-mixed with atrazine applied before corn planting provided > 92% control of glyphosate-resistant giant ragweed. Fall and early spring application of 2,4-D was not effective (73% control); however, tank-mixing 2,4-D with iodosulfuron /thiencarbazone provided 84 and 92% giant ragweed control at 14 and 28 DAEST, respectively (Table 2).…”

Section: Resultsmentioning

confidence: 99%

Control of glyphosate-resistant giant ragweed (Ambrosia trifida L.) with premix of iodosulfuron/thiencarbazone applied alone or in tank mixtures in no-till corn (Zea mays L.)

Kaur

Jhala

2018

Can. J. Plant Sci.

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The objectives of this study were to evaluate the efficacy of a new premix of iodosulfuron (6%)/thiencarbazone (45%) applied alone or tank-mixed with 2,4-D, dicamba, glyphosate, or metribuzin in the fall and (or) early spring followed by preemergence (PRE) and postemergence (POST) herbicide applications for control of glyphosate-resistant giant ragweed and their effect on corn yield. Field experiments were conducted in no-till corn fields infested with glyphosate-resistant giant ragweed (20–30 plants m−2) near Clay Center and McCool Junction, NE, in 2013 and 2014, respectively. A premix of iodosulfuron/thiencarbazone applied alone or in split applications in the fall and early spring controlled glyphosate-resistant giant ragweed <60% and resulted in a density of 14 giant ragweed plants m−2, which was comparable to the untreated control at 28 d after early spring treatment (DAEST). Metribuzin or 2,4-D applied alone resulted in <75% giant ragweed control at 28 DAEST; however, 2,4-D or dicamba tank-mixed with iodosulfuron/thiencarbazone provided ≥92% control. Treatments including 2,4-D or dicamba led to 85%–98% reduction in giant ragweed biomass at 28 DAEST. A follow-up application of a premix of isoxaflutole/thiencarbazone tank-mixed with atrazine applied PRE was not effective, although a POST application of tembotrione + atrazine resulted in >91% control at 28 d after postemergence treatment. The premix applied alone did not provide effective control of giant ragweed in corn primarily because lack of residual activity.

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“…Atrazine has been reported to provide only 25–43% control of weedy sunflower 47 . Likewise, glyphosate tank‐mixed with atrazine provided only 27% control of GR giant ragweed, a weed species belonging to the same family 48 . Therefore, atrazine is not a suitable tank‐mix partner to control GR weedy sunflower.…”

Section: Resultsmentioning

confidence: 99%

First case of glyphosate resistance in weedy sunflower (Helianthus annuus)

Singh

Etheredge

McGinty

et al. 2020

Pest Management Science

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BACKGROUND: Weedy sunflower (Helianthus annuus L.) is a troublesome weed in row-crop production fields in South Texas. Populations with suspected resistance to glyphosate were evaluated with 1X and 4X rates (X = 868 g ae ha −1) of the herbicide, followed by a dose-response assay of the most resistant population. Molecular studies were conducted to determine if targetsite mechanisms were responsible for resistance in these populations. Additionally, field experiments were conducted at two locations (Somerville and Granger, TX) to evaluate the effectiveness of different tank-mix combinations in controlling naturally infesting glyphosate-resistant (GR) weedy sunflower populations in GR corn. RESULTS: In a study conducted in the growth chamber, seven of the 11 tested populations survived up to the 4X rate of glyphosate. The most-resistant population (TX15-11) was 29-fold more resistant to glyphosate, compared to the susceptible standard. In resistant populations, 5-21 more copies of the EPSPS gene were observed compared to the susceptible standard. In the field studies, tank-mix applications of glyphosate + halosulfuron-methyl, glyphosate + prosulfuron, glyphosate + a premix of halosulfuron-methyl and dicamba or glyphosate + a premix of diflufenzopyr and dicamba effectively controlled GR weedy sunflower populations. CONCLUSION: Glyphosate-resistance was observed in 81% of the putative resistant weedy sunflower populations tested in this study. Resistance in these populations was conferred primarily by amplification of the EPSPS gene. Effective control of GR weedy sunflower can be achieved by tank-mixes tested in the current study, which provides acceptable levels of crop safety.

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Preplant and Postemergence Control of Glyphosate-Resistant Giant Ragweed in Corn

Cited by 7 publications

References 20 publications

An integrated approach to control glyphosate‐resistant Ambrosia trifida with tillage and herbicides in glyphosate‐resistant maize

An integrated approach to control glyphosate‐resistant Ambrosia trifida with tillage and herbicides in glyphosate‐resistant maize

Control of glyphosate-resistant giant ragweed (Ambrosia trifida L.) with premix of iodosulfuron/thiencarbazone applied alone or in tank mixtures in no-till corn (Zea mays L.)

First case of glyphosate resistance in weedy sunflower (Helianthus annuus)

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