Effect of single or sequential POST herbicide applications on seed production and viability of glyphosate-resistant Palmer amaranth (<i>Amaranthus palmeri</i>) in dicamba- and glyphosate-resistant soybean

Sanctis, Jose H. S. de; Knežević, Stevan Z.; Kumar, Vipan; Jhala, Amit J.

doi:10.1017/wet.2021.7

Cited by 7 publications

(11 citation statements)

References 45 publications

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“…The experiment provided evidence that Palmer amaranth plants surviving glufosinate were fecund (2,400 to 22,000 seeds plant −1 ) and sequential applications of glufosinate significantly reduced seed production. The fecundity of Palmer amaranth surviving glufosinate applied at the vegetative stage in this research was similar to the fecundity of Palmer amaranth surviving glufosinate and other unrelated herbicides applied in the reproductive stage (de Sanctis et al., 2021; Jha & Norsworthy, 2012; Scruggs et al., 2020).…”

Section: Resultssupporting

confidence: 77%

“…In addition, cross pollination was not controlled in the study; thus, fertilization of female Palmer amaranth surviving glufosinate treatment may be a product of pollen from nontreated male Palmer amaranth in proximity. Similar research conducted did not control for volunteer pollen and the results were similar across tested variables (de Sanctis et al, 2021;Jha & Norsworthy, 2012;Scruggs et al, 2020). However, a true representation of decreased glufosinate susceptibility would be to evaluate biparental crosses of glufosinate-and nontreated plants.…”

Section: Palmer Amaranth Offspring Susceptibility To Glufosinatementioning

confidence: 78%

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Biological effects on Palmer amaranth surviving glufosinate

Jones

León

Everman

2022

Agrosystems Geosci & Env

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Palmer amaranth (Amaranthus palmeri S. Watson) is a difficult weed to manage due to competitive growth, fecundity, and evolved herbicide resistance. Limited information exist on the fecundity of vegetative stage Palmer amaranth surviving glufosinate applied at different timings. In addition, research has not investigated the germination or glufosinate susceptibility of the offspring from these surviving plants. Field experiments were conducted across three locations in 2019 to determine (a) the fecundity of Palmer amaranth plants surviving glufosinate applied at different vegetative growth stages, and (b) if the offspring from the surviving plants exhibited differential germination and susceptibility to glufosinate. Palmer amaranth was treated at three different vegetative sizes (5 cm, 7-10 cm, > 10 cm) and orthogonal combinations of these application timings. The application timings corresponded to early-, mid-and late-postemergence applications. Palmer amaranth plants surviving the mid-, late-, and the mid postemergence followed by late postemergence glufosinate application were fecund. Palmer amaranth plants surviving the mid postemergence followed by late postemergence application produced less seed than the plants surviving the mid postemergence and late postemergence application. Palmer amaranth was controlled with other glufosinate applications resulting in no seed production. Germination was affected across location and glufosinate treatments, but no clear trend/pattern was observed. The offspring from Palmer amaranth plants surviving glufosinate applications were controlled by all glufosinate rates tested. These experiments provide evidence that Palmer amaranth surviving glufosinate in the vegetative stages may remain fecund, but fecundity can vary with application timing. No measurable effect on the offspring germination or susceptibility to glufosinate was apparent.

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Section: Resultssupporting

confidence: 77%

Section: Palmer Amaranth Offspring Susceptibility To Glufosinatementioning

confidence: 78%

Biological effects on Palmer amaranth surviving glufosinate

Jones

León

Everman

2022

Agrosystems Geosci & Env

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“…Late-season herbicide applications can reduce seed production (de Sanctis et al 2021;Jha and Norsworthy 2012;Sarangi et al 2020;Scruggs et al 2020). However, no treatments applied to Palmer amaranth after seed development caused a great decrease in seed viability in the present study, although previous research reported that trifluralin applied to cheat seed can reduce emergence by more than 90% (Stone et al 2001).…”

Section: Chemical Inflorescence Treatmentmentioning

confidence: 99%

“…Other research evaluating 2,4-D, dicamba, glufosinate, and glyphosate applied at first female Palmer amaranth inflorescence resulted in decreased seed production but not germination or viability (Scruggs et al 2020). Similarly, registered rates of acifluorfen, dicamba, fluthiacet, fomesafen, glyphosate, and lactofen applied to Palmer amaranth up to 90 cm tall did not affect seed viability but seed production was reduced (de Sanctis et al 2021). Each of these studies evaluated herbicides that were applied before seed maturity.…”

Section: Introductionmentioning

confidence: 99%

Influence of herbicides on germination and quality of Palmer amaranth (Amaranthus palmeri) seed

et al. 2021

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Lab and greenhouse studies were conducted to evaluate the effects of chemical treatments applied to Palmer amaranth seeds or gynoecious plants retaining seeds on seed germination and quality. Treatments applied to physiologically mature Palmer amaranth seed included acifluorfen, dicamba, ethephon, flumioxazin, fomesafen, halosulfuron, linuron, metribuzin, oryzalin, pendimethalin, pyroxasulfone, S-metolachlor, saflufenacil, trifluralin, and 2,4-D plus crop oil concentrate applied at 1 and 2× the suggested use rates from the manufacturer. Germination was reduced by 20% from 2,4-D, 15% from dicamba, and 13% from halosulfuron and pyroxasulfone. Dicamba, ethephon, halosulfuron, oryzalin, trifluralin, and 2,4-D decreased the average seedling length by at least 50%. Due to the observed effect of dicamba, ethephon, halosulfuron, oryzalin, trifluralin, and 2,4-D, these treatments were applied to gynoecious Palmer amaranth inflorescence at the 2× registered application rates to evaluate their effects on progeny seed. Dicamba decreased seed germination by 24%, whereas all other treatments were similar to the control. Crush tests showed seed viability was greater than 95%; thus, dicamba did not have a strong effect on seed viability. No treatments applied to Palmer amaranth inflorescence affected average seedling length; therefore, chemical treatments did not affect the quality of seeds that germinated.

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“…Dicamba can control 120 annual, 19 biennial, and 65 perennial broadleaf weeds (Anonymous 2020). Growers rely on dicamba for POST broadleaf weed control, including control of glyphosate-resistant Palmer amaranth (Amaranthus palmeri S.Watson) in DGR soybean (De Sanctis et al 2021); however, velvetleaf escape has been observed where dicamba was the only herbicide applied POST (Figure 1). Murphy and Lindquist (2002) reported poor control of velvetleaf with dicamba at 318 g ae ha −1 under field conditions.…”

Section: Introductionmentioning

confidence: 99%

Interaction of dicamba, fluthiacet-methyl, and glyphosate for control of velvetleaf (Abutilon theophrasti) in dicamba/glyphosate–resistant soybean

Sanctis

Jhala

2021

Weed Technol

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Velvetleaf is an economically important weed in agronomic crops in Nebraska and the United States. Dicamba applied alone usually does not provide complete velvetleaf control, particularly when velvetleaf is greater than 15 cm tall. The objectives of this experiment were to evaluate the interaction of dicamba, fluthiacet-methyl, and glyphosate applied alone or in a mixture in two- or three-way combinations for velvetleaf control in dicamba/glyphosate-resistant (DGR) soybean and to evaluate whether velvetleaf height (≤ 12 cm or ≤ 20 cm) at the time of herbicide application influences herbicide efficacy, velvetleaf density, biomass, and soybean yield. Field experiments were conducted near Clay Center, Nebraska in 2019 and 2020. The experiment was arranged in a split-plot with velvetleaf height (≤ 12 cm or ≤ 20 cm) as the main plot treatment and herbicides as sub-plot treatment. Fluthiacet provided ≥ 94% velvetleaf control 28 d after treatment (DAT) and ≥ 96% biomass reduction regardless of application rate or velvetleaf height. Velvetleaf control was 31% to 74% at 28 DAT when dicamba or glyphosate was applied alone to velvetleaf ≤ 20 cm tall compared with 47% to 100% control applied to ≤ 12 cm tall plants. Dicamba applied alone to ≤ 20 cm tall velvetleaf provided < 75% control and < 87% biomass reduction 28 DAT compared with ≥ 90% control with dicamba at 560 g ae ha−1 + fluthiacet at 7.2 g ai ha−1 or glyphosate at 1,260 g ae ha−1. Dicmaba at 280 g ae ha−1 + glyphosate at 630 g ae ha−1 applied to ≤ 20 cm tall velvetleaf resulted in 86% control 28 DAT compared with the expected 99% control. The interaction of dicamba + fluthiacet + glyphosate was additive for velvetleaf control and biomass reduction regardless of application rate and velvetleaf height.

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Effect of single or sequential POST herbicide applications on seed production and viability of glyphosate-resistant Palmer amaranth (Amaranthus palmeri) in dicamba- and glyphosate-resistant soybean

Cited by 7 publications

References 45 publications

Biological effects on Palmer amaranth surviving glufosinate

Biological effects on Palmer amaranth surviving glufosinate

Influence of herbicides on germination and quality of Palmer amaranth (Amaranthus palmeri) seed

Interaction of dicamba, fluthiacet-methyl, and glyphosate for control of velvetleaf (Abutilon theophrasti) in dicamba/glyphosate–resistant soybean

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