Single and sequential applications of dicamba for the control of glyphosate-resistant common ragweed in glyphosate- and dicamba-resistant soybean

Byker, Holly P.; Wely, Annemarie C. Van; Soltani, Nader; Lawton, Mark B.; Robinson, Darren E.; Sikkema, Peter H.

doi:10.1139/cjps-2017-0118

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…Dicamba-resistant soybean and cotton (Gossypium hirsutum L.) were commercialized in 2017 for effectively managing herbicide-resistant broadleaf weeds, especially glyphosate-resistant broadleaf weeds, which became widespread due to repeated use of glyphosate in glyphosate-resistant crops (Dodson et al 2021;Peterson et al 2018). Dicamba is an effective option for controlling glyphosate-resistant broadleaf weeds such as common ragweed (Ambrosia artemisiifolia L.) (Byker et al 2017), waterhemp (Johnson et al 2010;Spaunhorst et al 2014), giant ragweed (Ambrosia trifida L.) (Johnson et al 2010;Spaunhorst et al 2014;Vink et al 2012), horseweed (Erigeron canadensis L.) (Johnson et al 2010), and Palmer amaranth (de Sanctis and Jhala 2021; Johnson et al 2010;McDonald et al 2021). Due to dicamba's effectiveness in managing glyphosate-resistant weeds, dicamba-resistant crops were rapidly adopted by growers, as evidenced by a 69% increase in the adoption of dicamba-resistant cotton from 2016 to 2019 (Dodson et al 2021) and a 43% increase in adoption of dicambaresistant soybean from 2016 to 2018 (Wechsler et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of dicamba and dicamba/tembotrione with and without ammonium sulfate for broadleaf weed control

Singh,

Barnes,

Dintelmann

et al. 2024

Weed Technol

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Mixing ammonium sulfate (AMS) can increase dicamba volatility. Therefore, AMS cannot be used with dicamba products in dicamba-resistant soybean. However, most dicamba products applied in corn are labeled to mix with AMS. The objectives of this study were to evaluate broadleaf weed control with dicamba (DiFlexx®) and dicamba/tembotrione (DiFlexx® DUO) applied alone or with AMS or AMS substitute and their effect on broadleaf weed density and biomass. Field experiments were conducted in Illinois, Missouri, and Nebraska in 2018 and 2019. In Illinois and Nebraska, mixing AMS + crop oil concentrate (COC) with dicamba applied at 1,120 g ae ha−1 increased the control of Palmer amaranth and waterhemp (Amaranthus species) from 78% to 92% and velvetleaf from 73% to 96% compared with dicamba applied alone 14 d after application (DAA); however, Missouri data showed no difference. Mixing AMS + COC with dicamba/tembotrione at 597 and 746 g ai ha−1 did not improve broadleaf weed control 14 DAA at any site compared with dicamba/tembotrione applied alone. Control of Amaranthus species was increased from 82% with dicamba applied at 840 g ae ha−1 to 96% when mixed with AMS + COC 28 DAA in Illinois; however, control was similar to dicamba applied at 1,120 g ae ha−1. Broadleaf weed control did not differ among dicamba or dicamba/tembotrione 28 and 56 DAA in Missouri and Nebraska. Broadleaf weed density decreased from 64 plants m−2 to 24 plants m−2 with dicamba at 1,120 g ae ha−1 with AMS + COC 14 DAA in Nebraska; however, no differences were observed in broadleaf weed density or biomass 56 DAA in any state. The results suggest that dicamba or dicamba/tembotrione can be applied without AMS or AMS substitute, especially at higher rates, without losing broadleaf weed control efficacy.

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Section: Introductionmentioning

confidence: 99%

Efficacy of dicamba and dicamba/tembotrione with and without ammonium sulfate for broadleaf weed control

Singh,

Barnes,

Dintelmann

et al. 2024

Weed Technol

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“…[16][17][18] The use of herbicides targeting multiple sites-of-action for managing herbicide-resistant weeds is among the best recommended management practices. 19 These herbicides are used either sequentially, 20,21 in pre-mixtures, 22,23 or as tank-mixtures. 21,24 Glyphosate is often used in combination with dicamba not only to manage glyphosate-resistant weeds but also to broaden the weed control spectrum.…”

Section: Introductionmentioning

confidence: 99%

Impact of volatility reduction agents on dicamba and glyphosate spray solutionpH, droplet dynamics, and weed control

Kouame

Butts

Werle

et al. 2022

Pest Management Science

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BACKGROUND: Regulations in 2021 required the addition of a volatility reduction agent (VRA) to dicamba spray mixtures for postemergence weed control. Understanding the impact of VRAs on weed control, droplet dynamics, and spray pH is essential. RESULTS: Adding glyphosate to dicamba decreased the solution pH by 0.63 to 1.85 units. Across locations, potassium carbonate increased the tank-mixture pH by 0.85 to 1.65 units while potassium acetate raised the pH by 0.46 to 0.53 units. Glyphosate and dicamba in tank-mixture reduced Palmer amaranth control by 14 percentage points compared to dicamba alone and decreased barnyardgrass control by 12 percentage points compared to glyphosate alone 4 weeks after application (WAA). VRAs resulted in a 5-percentage point reduction in barnyardgrass control 4 WAA. Common ragweed, common lambsquarters, and giant ragweed control were unaffected by herbicide solution 4 WAA. Dicamba alone produced a larger average droplet size and had the fewest driftable fines (% volume < 200 ∼m). Potassium acetate produced a larger droplet size than potassium carbonate for D v0.1 and D v0.5 . The addition of glyphosate to dicamba decreased droplet size from the entire spray droplet spectrum (D v0.1 , D v0.5 , D v0.9 ). CONCLUSION: A reduction in spray pH, droplet size, and weed control was observed from mixing dicamba and glyphosate. It may be advisable to avoid tank-mixtures of these herbicides and instead, apply them sequentially to maximize effectiveness. VRAs differed in their impacts on spray solution pH and droplet dynamics, but resulted in a minimal negative to no impact on weed control.

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“…Corn yields do not seem to differ between weed management practices using one vs. sequential GBH applications whereas the combination with other herbicides is unclear (Caleb et al., 2004; Craven et al., 2021; Smedbol et al., 2020; Walter et al., 2004). On the other hand, soybean yields seem to be higher with sequential GBH application in comparison to a single application (Byker et al., 2018; Smedbol et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Glyphosate and aminomethylphosphonic acid contents in field crops soils under various weed management practices

Samson‐Brais

Lucotte

Moingt

et al. 2022

Agrosystems Geosci & Env

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To avoid yield loss in field crops associated with glyphosate‐resistant weed and changes in their population dynamics, repeated applications of glyphosate‐based herbicides (GBH) and combination with other herbicides are weed management practices (WMP) increasingly used worldwide, and particularly so in southern Quebec (Canada). These practices affect soil biological activity as well as soil functions but could also influence glyphosate and its main degradation product, the aminomethylphosphonic acid (AMPA), persistence. This study was conducted in corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] field crops to evaluate the effects of single vs. repeated GBH applications, with or without the addition of other herbicides, on glyphosate and AMPA persistence in soils throughout a growing season. In corn plots, the highest glyphosate content (0.11 mg kg–1) was observed following two GBH applications combined with other herbicides (i.a. S‐metolachlor and mesotrione). In soybean plots, the highest glyphosate content (0.18 mg kg–1) was also measured following two GBH applications combined with other herbicides (i.a. imazethapyr and chlorimuron). AMPA contents in corn plots soils were similar whatever WMP employed, whereas differences were observed in soybean plots according to the WMP. Soybean plots thus seemed more responsive to variation in weed management practices than corn plots. This study highlights the persistence of glyphosate and AMPA in agricultural soils at least 8 wk after the last GBH application.

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Single and sequential applications of dicamba for the control of glyphosate-resistant common ragweed in glyphosate- and dicamba-resistant soybean

Cited by 5 publications

References 12 publications

Efficacy of dicamba and dicamba/tembotrione with and without ammonium sulfate for broadleaf weed control

Efficacy of dicamba and dicamba/tembotrione with and without ammonium sulfate for broadleaf weed control

Impact of volatility reduction agents on dicamba and glyphosate spray solutionpH, droplet dynamics, and weed control

Glyphosate and aminomethylphosphonic acid contents in field crops soils under various weed management practices

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