Benefit of tank-mixing dicamba with glyphosate applied post-emergence for weed control in dicamba plus glyphosate resistant soybean

Underwood, Matthew G.; Soltani, Nader; Hooker, David C.; Robinson, Darren E.; Vink, Joseph P.; Swanton, Clarence J.; Sikkema, Peter H.

doi:10.1139/cjps-2016-0292

Cited by 9 publications

(12 citation statements)

References 21 publications

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“…In contrast to percent control, glyphosate + dicamba applied alone POST provided greater Palmer amaranth biomass reduction of 97% compared to 76% reduction with glyphosate at 28 d after POST (Table 4). However, Underwood et al (2017) reported similar redroot pigweed biomass reduction of 90 to 94% with glyphosate applied alone or tank-mixed with dicamba. Pre-emergence herbicides followed by glyphosate + dicamba or glyphosate had similar biomass reduction of 76 to 98%, except acetochlor + clopyralid + flumetsulam applied (v/v).…”

Section: Monthmentioning

confidence: 89%

“…However, Crow et al (2016) reported greater (89%) control of >20-cm tall Palmer amaranth with glyphosate + dicamba compared to glyphosate (69%) at 28 d after POST. Underwood et al (2017) reported greater redroot pigweed (Amaranthus retroflexus L.) control of 99% with glyphosate + dicamba compared to 94% control with glyphosate at 14 d after POST. In contrast to percent control, glyphosate + dicamba applied alone POST provided greater Palmer amaranth biomass reduction of 97% compared to 76% reduction with glyphosate at 28 d after POST (Table 4).…”

Section: Monthmentioning

confidence: 99%

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Economics of Management of Photosystem II‐ and HPPD‐inhibitor‐Resistant Palmer amaranth in Corn

Chahal

Jhala

2018

Agronomy Journal

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P almer amaranth (Amaranthus palmeri S. Wats.) is the most problematic and difficult to control weed among crops in the United States (Chahal et al., 2015, 2017; Kohrt and Sprague, 2017). Palmer amaranth biotypes resistant to microtubule-, acetolactate synthase (ALS)-, photosystem (PS) II-, 5-enol-pyruvylshikimate-3-phosphate synthase (EPSPS)-, hydroxyphenylpyruvate dioxygenase (HPPD)-, and protoporphyrinogen oxidase (PPO)-inhibitor herbicides have been reported in the United States (Heap, 2017a). Photosystem IIand HPPD-inhibitors are commonly used herbicides for weed control in sweet corn (Zea mays L.), seed corn, popcorn, and field corn due to their pre-emergence (PRE) and post-emergence (POST) activity, broad-spectrum of weed control, and crop safety (Bollman et al., 2008; Fleming et al., 1988; Swanton et al., 2007). The evolution of PS II-and HPPD-inhibitor-resistant Palmer amaranth in Nebraska has become a management challenge for corn growers because it reduces the number of herbicide options for Palmer amaranth control (Jhala et al., 2014). Growers require alternate herbicide programs focusing on the use of herbicides with different sites of action applied PRE and POST, herbicide rotation, rotation of herbicide-resistant (HR) crop traits, and rotation with conventional cultivars for the management of HR Palmer amaranth (Norsworthy et al., 2012; Oliveira et al., 2017). The majority of corn acreage in Nebraska is planted to glyphosate [N-(phosphonomethyl)glcine]-resistant corn hybrids, utilizing either single or sequential glyphosate applications for POST weed control (Chahal et al., 2017; Jhala et al., 2014). Glyphosate is a systemic herbicide and has a broadspectrum of weed control (Anonymous, 2017a). Glyphosate could be considered as an effective herbicide option for the management of PS II-and HPPD-inhibitor-resistant Palmer amaranth in glyphosate-resistant corn; however, the continuous use of glyphosate for weed control in glyphosate-resistant cornsoybean [Glycine max (L.) Merr.] cropping systems over the last two decades has resulted in the evolution of glyphosate-resistant weeds (Heap, 2017a). In Nebraska, glyphosate-resistant weeds, including common ragweed (Ambrosia artemisiifolia L.), common waterhemp (Amaranthus rudis Sauer), horseweed [Conyza canadensis (L.) Cronq.], giant ragweed (Ambrosia trifida L.), kochia [Kochia scoparia (L.

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Section: Monthmentioning

confidence: 89%

Section: Monthmentioning

confidence: 99%

Economics of Management of Photosystem II‐ and HPPD‐inhibitor‐Resistant Palmer amaranth in Corn

Chahal

Jhala

2018

Agronomy Journal

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“…Dicamba is typically tank mixed with other components (e.g., water conditioner, other herbicides with different SOAs, drift reduction agent [DRA], adjuvant) to broaden the spectrum of weed control and improve performance (Anonymous 2019b;Anonymous 2019a;Roskamp et al 2013;Spaunhorst et al 2014). Glyphosate is a common tank-mix partner used to broaden the spectrum of weed control (e.g., grass species) (Underwood et al 2017). Glyphosate is a weak acid (Shaner et al 2014) that is formulated as various salts (e.g., isopropylamine, potassium) with low formulation pH.…”

Section: Introductionmentioning

confidence: 99%

Spray solution pH and soybean injury as influenced by synthetic auxin formulation and spray additives

et al. 2020

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Use of synthetic auxin herbicides has increased across the United States Midwest following adoption of synthetic auxin-resistant soybean traits in addition to extensive use of these herbicides in corn. Off-target movement of synthetic auxin herbicides such as dicamba can lead to severe injury to sensitive plants nearby. Previous research has documented effects of glyphosate on spray solution pH and volatility of several dicamba formulations, but our understanding of the relationships between glyphosate and dicamba formulations commonly used in corn and for 2,4-D remains limited. The objectives of this research were to i) investigate the roles of synthetic auxin herbicide formulation, glyphosate and spray additives on spray solution pH, ii) assess the impact of synthetic auxin herbicide rate on solution pH, and iii) assess the influence of glyphosate and application time of year on dicamba and 2,4-D volatility using soybean as bioindicators in low-tunnel field volatility experiments. Addition of glyphosate to a synthetic auxin herbicide decreased solution pH below 5.0 for four of the seven herbicides tested (initial pH of water source = 7.45 to 7.70). Solution pH of most treatments was lower at a higher application rate (4× the labeled POST rate) than the 1× rate. Among all treatment factors, inclusion of glyphosate was the most important affecting spray solution pH; however, the addition of glyphosate did not influence Area Under the Injury over Distance Stairs (AUIDS; p=0.366) in low-tunnel field volatility experiments. Greater soybean injury in field experiments was associated with high air temperatures (maximum >29 C) and low wind speeds (mean 0.3 to 1.5 m s-1) during the 48-h period following treatment application. The two dicamba formulations (diglycolamine with VaporGrip® and sodium salts) showed similar levels of soybean injury for applications that occurred later in the growing season. Greater soybean injury was observed for dicamba than 2,4-D treatments.

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“…Glyphosate is a WSSA Group 9 herbicide that has broad-spectrum activity on both monocots and dicots (Shaner et al 2014). Growers often prefer to apply glyphosate as a tank mixture with other herbicides, and the addition of glyphosate may help growers control other weed species against which dicamba alone would be weak (Underwood et al 2017). The MoA of glyphosate works by inhibiting the biosynthesis of aromatic amino acids through the EPSPS pathway (Amrhein et al 1980).…”

Section: Introductionmentioning

confidence: 99%

“…The focus of the study was on the time of application, within a 24-h period, using dicamba, glyphosate, and a mixture of both herbicides, and to determine the effect of weed height and TOD on herbicide efficacy. Although this study focuses on dicamba, glyphosate was included because it is affected by photoperiod differences (McAllister and Haderlie 1985), as well as being a common mixture with dicamba in the Georgia cotton-growing region (Underwood et al 2017). Experiments evaluated the influence on weed control of diurnal time of herbicide application of dicamba, glyphosate, and a combination of the two.…”

Section: Introductionmentioning

confidence: 99%

Influence of time of day on dicamba and glyphosate efficacy

et al. 2021

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Renewed interest in studying auxin herbicides (WSSA group 4) is increasing due to the release of genetically engineered crop varieties that are tolerant to PRE and POST applications of specific formulations of dicamba. The development of auxin-resistant crops was in response to the development of herbicide-resistant weed species to glyphosate and other herbicides. Research was conducted at multiple field locations in Georgia in 2018 and 2019 to examine weed control when POST herbicides were applied to dicamba and glyphosate-resistant cotton at eight different points in time over a 24-hr period. Applications occurred at 1-hr prior to sunrise all the way up to midnight in one day to examine the effect of herbicide application timing on broadleaf weed control. Glyphosate, dicamba, and glyphosate plus dicamba were applied at each timing. Visual ratings of weed control were evaluated at 7, 14, 21, and 28 days after treatment (DAT). Weed control was affected by herbicide application timing. Midnight applications resulted in the lowest levels of control. Sicklepod, pitted morningglory, and prickly sida control was 49, 38, and 41% respectively. Greatest control of all three species (up to 99%) occurred from the noon to 1-hr prior to sunset application timings. Orthogonal contrasts of timing of application indicated that weed control was improved with day > night and pre-dawn > midnight.

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Benefit of tank-mixing dicamba with glyphosate applied post-emergence for weed control in dicamba plus glyphosate resistant soybean

Cited by 9 publications

References 21 publications

Economics of Management of Photosystem II‐ and HPPD‐inhibitor‐Resistant Palmer amaranth in Corn

Economics of Management of Photosystem II‐ and HPPD‐inhibitor‐Resistant Palmer amaranth in Corn

Spray solution pH and soybean injury as influenced by synthetic auxin formulation and spray additives

Influence of time of day on dicamba and glyphosate efficacy

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