Waterhemp (<i>Amaranthus tuberculatus)</i> control under drought stress with 2,4‐dichlorophenoxyacetic acid and glyphosate

Skelton, Joshua J.; Ma, Rong; Riechers, Dean E.

doi:10.1111/wbm.12092

Cited by 18 publications

(13 citation statements)

References 31 publications

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“…This may be a result of the field site receiving 30 mm more precipitation in June 2016 than August 2015 (Table 5). Skelton et al (2016) reported that the efficacy of herbicides such as glyphosate is reduced when A. tuberculatus is under drought stress and that A. tuberculatus dry matter was reduced by 2% when receiving 10 ml water day −1 , but dry matter of plants that received 40 ml water day −1 was reduced by 56%. Nevertheless, these results clearly indicate glyphosate resistance in the MO-Ren population as well.…”

Section: Resultsmentioning

confidence: 99%

Investigations of 2,4-D and Multiple Herbicide Resistance in a Missouri Waterhemp (Amaranthus tuberculatus) Population

et al. 2018

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Research was conducted from 2015 to 2017 to investigate the potential for 2,4-D and multiple herbicide resistance in a waterhemp [Amaranthus tuberculatus(Moq.) J. D. Sauer] population from Missouri (designated MO-Ren). In the field, visual control of the MO-Ren population with 0.56 to 4.48 kg 2,4-D ha−1ranged from 26% to 77% in 2015 and from 15% to 55% in 2016. The MO-Ren population was highly resistant to chlorimuron, with visual control never exceeding 7% either year. Estimates of the 2,4-D dose required to provide 50% visual control (I50) of the MO-Ren population were 1.44 kg ha−1compared with only 0.47 kg 2,4-D ha−1for the susceptible population. Based on comparisons to a susceptible population in dose–response experiments, the MO-Ren population was approximately 3-fold resistant to 2,4-D, and 7-, 7-, 22-, and 14-fold resistant to atrazine, fomesafen, glyphosate, and mesotrione, respectively. Dicamba and glufosinate were the only two herbicides that provided effective control of the MO-Ren population in these experiments. Examinations of multiple herbicide resistance at the individual plant level revealed that 16% of the plants of the MO-Ren population contained genes stacked for six-way herbicide resistance, and only 1% of plants were classified as resistant to a single herbicide (glyphosate). Results from these experiments confirm that the MO-RenA. tuberculatuspopulation is resistant to 2,4-D, atrazine, chlorimuron, fomesafen, glyphosate, and mesotrione, making this population the third 2,4-D–resistantA. tuberculatuspopulation identified in the United States, and the first population resistant to six different herbicidal modes of action.

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Section: Resultsmentioning

confidence: 99%

Investigations of 2,4-D and Multiple Herbicide Resistance in a Missouri Waterhemp (Amaranthus tuberculatus) Population

et al. 2018

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“…However, within the water management factor, control was lower when plants developed under a moderate hydric condition at the vegetative stage of 1-3 tillers (Table 4). Generally speaking, when plants are submitted to periods of water deficit, they tend to decrease their translocation, and this may decrease herbicide efficacy (Skelton et al, 2016), as observed at the early stages of development.…”

Section: Resultsmentioning

confidence: 99%

Effect of Glyphosate on Guineagrass Submitted to Different Soil Water Potential

et al. 2018

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The action of herbicides on weeds that develop under water deficit can be compromised, because the routes of penetration of hydrophilic herbicides are reduced due to the lower hydration of the cuticle in these plants. Moreover, hydrophobic compounds found in the epicuticular wax coating of plants under water stress, hinder the penetration of hydrophilic compounds. This study evaluated the control efficiency of glyphosate on guineagrass plants when submitted to different water deficits. The study was conducted in a greenhouse, and treatments were composed of guineagrass plants submitted to three soil water conditions [low water deficit (13%), intermediate water deficit (10%) and high water restriction (8%)], three doses of glyphosate (0.0, 270.0 and 540.0 g ha-1) and two phenological stages of plant development (4-6 leaves and 1-3 tillers). The water management started when plants presented two developed leaves. Visual evaluations were performed 7, 14, 21 and 35 days after the application of the herbicide; the morpho-physiological parameters of the specific leaf area, stomatal conductance and the difference between the environment temperature and the leaf temperature on the day of the herbicide application were also analyzed at the end of the study, as well as the dry matter of shoot and root. With the increase of the water restriction, there was a decrease in the analyzed morpho-physiological parameters, as well as in the dry matter accumulation of the shoot and roots of the studied plants. Plant control was more efficient when a 540 g ha-1 dose of glyphosate was applied, and when they were controlled at their vegetative stage of 1-3 tiller, and with a water management of 13%. It is possible to state that guineagrass under water restriction have less control efficacy when treated with glyphosate.

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“…Soil moisture variations also influence glyphosate performance. Weeds grown in soils with a water status near field capacity are often most sensitive to glyphosate (Adkins et al 1998a; Franz et al 1997), while flooding or drought conditions tend to reduce glyphosate efficacy (Skelton et al 2016; Zhou et al 2007). In contrast, Sherner et al (2017) reported greater glyphosate efficacy on flooded soils, Tworkoski et al (1998) described greater efficacy under dry soil conditions, and Zanatta et al (2007) found no difference between varying soil moisture levels.…”

Section: Introductionmentioning

confidence: 99%

Environmental Factors Moderate Glyphosate-induced Antagonism of POST Herbicides on the Rapid Response Biotype of Glyphosate-Resistant Giant Ragweed (Ambrosia trifida)

Harre

Young

2018

Weed Sci

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In the rapid response (RR) biotype of glyphosate-resistant (GR) giant ragweed (Ambrosia trifidaL.), exposure to glyphosate elicits H2O2production in mature leaves, resulting in foliage loss and reduced glyphosate translocation. When glyphosate is applied with POST herbicides intended to improve control ofA. trifida, the RR to glyphosate has the propensity to antagonize these herbicide combinations. This research documents how transient changes in air temperature, soil moisture, and light intensity during a 6-d period surrounding herbicide application regulate induction of the RR and the effect on POST herbicide interactions with glyphosate. Air temperature had the greatest influence on H2O2accumulation in leaf disks following treatment with glyphosate, as plants at 30 C produced more than twice the amount of H2O2at 2.5 h after treatment compared with 10 C. Plants under field capacity conditions accumulated nearly 50% more H2O2than those at one-third field capacity, while those under no shade had only 18% more H2O2compared with those in a shaded environment. Despite these initial results, dry weight reduction at 21 d after treatment never differed by more than 8% between levels of environmental factors, thus indicating a negligible influence on glyphosate efficacy. The magnitude of glyphosate-induced antagonism was generally greater at 30 C (12% to 21% less than expected control) versus 10 C (11% to 16%) on atrazine, cloransulam, dicamba, and topramezone and was greater at field capacity (20% to 24%) versus one-third field capacity (11% to 15%) on cloransulam and topramezone. These results indicate air temperatures and soil moisture levels conducive to optimal plant growth accelerate the RR to glyphosate, thereby increasing the likelihood of glyphosate-induced antagonism on several translocated herbicides.

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Waterhemp (Amaranthus tuberculatus) control under drought stress with 2,4‐dichlorophenoxyacetic acid and glyphosate

Cited by 18 publications

References 31 publications

Investigations of 2,4-D and Multiple Herbicide Resistance in a Missouri Waterhemp (Amaranthus tuberculatus) Population

Investigations of 2,4-D and Multiple Herbicide Resistance in a Missouri Waterhemp (Amaranthus tuberculatus) Population

Effect of Glyphosate on Guineagrass Submitted to Different Soil Water Potential

Environmental Factors Moderate Glyphosate-induced Antagonism of POST Herbicides on the Rapid Response Biotype of Glyphosate-Resistant Giant Ragweed (Ambrosia trifida)

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