Surveying stakeholder’s perception of glufosinate and use in North Carolina

Jones, Eric A. L.; Cahoon, Charles W.; León, Ramón G.; Everman, Wesley J.

doi:10.1017/wet.2022.31

Cited by 5 publications

(10 citation statements)

References 46 publications

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“…Although sequential applications of glufosinate ceased or decreased Palmer amaranth seed production, these applications should be recommended to farmers with caution to reduce the selection pressure on Palmer amaranth evolving resistance to glufosinate. Sequential applications of glufosinate are common in North Carolina row crops and many North Carolina farmers utilize additional tactics for herbicide resistance management (Jones et al., 2022).…”

Section: Resultsmentioning

confidence: 99%

“…Glufosinate was applied at three timings when Palmer amaranth was 5 (early postemergence), 7–10 (mid postemergence), and 10–20 cm tall (late postemergence), and all orthogonal combinations of those timings (Table 1). The glufosinate application timings were selected to represent how North Carolina farmers are currently using the herbicide (Jones et al., 2022). A nontreated check was included in the experiment as well.…”

Section: Methodsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Biological effects on Palmer amaranth surviving glufosinate

Jones

León

Everman

2022

Agrosystems Geosci & Env

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“…States, where glufosinate is applied extensively and intensively (Jones, Cahoon, et al, 2022;Riar et al, 2013). Although glufosinate is efficacious on most weeds elsewhere, continued sole reliance will select for more glufosinate-resistant weeds (Owen & Zelaya, 2005;Schwartz-Lazaro et al, 2018;Shergill et al, 2018;Shyam et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Confirmation and inheritance of glufosinate resistance in an Amaranthus palmeri population from North Carolina

Jones,

Dunne,

Cahoon

et al. 2024

Plant Enviro Interactions

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A putative glufosinate‐resistant Amaranthus palmeri population was reported in 2015 in Anson County, North Carolina. The results from dose–response assays conducted in the field suggested plants were surviving lethal rates of glufosinate. Dose–response assays conducted in the glasshouse determined the Anson County accession exhibited reduced susceptibility to glufosinate compared to three glufosinate‐susceptible populations. The LD50 values (210–316 g ai ha−1) for the Anson County population were always higher than the LD50 values (118–158 g ai ha−1) for the tested susceptible populations from the dose–response assays. Anson County plants that survived lethal glufosinate rates were reciprocally crossed with susceptible plants to create F1 genotypes and treated with a lethal rate of glufosinate (267 g ai ha−1; ascertained from glasshouse dose–response assay) to determine the distribution of injury and survival for each cross compared to a cross of susceptible parents. The distribution of injury was non‐normal for the crosses containing an Anson County plant compared to the cross with a susceptible parent. Survival was 68%–84% for crosses containing an Anson County plant, whereas the survival was significantly reduced to 35% for the susceptible plant cross. Chi‐square goodness of fit tests were used to test inheritance models to describe the responses of the genotypes. The resistant × susceptible crosses were best described with a heterozygous two loci with incomplete dominance model compared to the resistant × resistant cross that was best described with a heterozygous single locus with incomplete dominance model. The Anson County population has evolved resistance to glufosinate that is heritable and likely conferred by an oligogenic mechanism with incomplete dominance.

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“…A similar situation occurs with common ragweed, ivyleaf morningglory, and sicklepod, which are also pervasive and hard-to-control weeds in the southeastern United States (Jones et al 2022;Van Wychen 2017;Webster and Nichols 2012). Previous research has shown that dicamba and glufosinate are effective on these species; however, mixtures and sequential applications of these herbicides have not been evaluated (Everman et al 2007;Kalina et al 2021;Leon et al 2016;Schrage 2018).…”

Section: Introductionmentioning

confidence: 93%

Control of pervasive row crop weeds with dicamba and glufosinate applied alone, mixed, or sequentially

2022

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Dicamba and glufosinate are among the few effective postemergence herbicides to control multiple herbicide-resistant weeds in Southeastern United States cotton and soybean production. Field studies were conducted to determine the effect of weed size and the application of dicamba and glufosinate individually, mixed, or sequentially on common ragweed, goosegrass, large crabgrass, ivyleaf morningglory, Palmer amaranth, and sicklepod control. Sequential herbicide treatments were applied seven days after the initial treatment. The tested weeds sizes predominantly did not affect weed control. Control of broadleaf weed species with sequential herbicide applications never increased compared to the initial herbicide application. Two applications of glufosinate and/or dicamba + glufosinate controlled grasses better than one application. The order of the herbicides in the sequential applications did not affect broadleaf species control, while the herbicide order was important for the control of grass weeds. Grass weed control was higher when glufosinate was applied before dicamba. Dicamba + glufosinate additively controlled the weeds except for goosegrass, for which control was less for dicamba + glufosinate compared to glufosinate alone. The results of the experiment provide evidence that dicamba and glufosinate applied individually, mixed, and sequentially are effective on common row crop weeds found in the southeastern United States but the species present may dictate how the herbicides are applied together.

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Surveying stakeholder’s perception of glufosinate and use in North Carolina

Cited by 5 publications

References 46 publications

Biological effects on Palmer amaranth surviving glufosinate

Biological effects on Palmer amaranth surviving glufosinate

Confirmation and inheritance of glufosinate resistance in an Amaranthus palmeri population from North Carolina

Control of pervasive row crop weeds with dicamba and glufosinate applied alone, mixed, or sequentially

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