Identification of glyphosate resistance in <i>Salsola tragus</i> in north‐eastern Oregon

Barroso, Judit; Gourlie, Jennifer A.; Lutcher, L. K.; Li, Mingyang; Mallory‐Smith, Carol

doi:10.1002/ps.4525

Cited by 18 publications

(15 citation statements)

References 22 publications

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“…At present glyphosate‐resistant K. scoparia is a major economic problem on the Great Plains of the USA and in the Prairie provinces of Canada, and is spreading rapidly due to its efficient tumbleweed seed dispersal mechanism. Salsota tragus is also a tumbleweed, and glyphosate‐resistant S. tragus has only recently been identified in isolated populations in Montana and Oregon , . It will be interesting to see if its dispersal mechanism will provide it with rapid spread like that of Kochia .…”

Section: Weed Familiesmentioning

confidence: 99%

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Overview of glyphosate‐resistant weeds worldwide

Heap¹,

Duke

2017

Pest Management Science

393

287

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Glyphosate is the most widely used and successful herbicide discovered to date, but its utility is now threatened by the occurrence of several glyphosate-resistant weed species. Glyphosate resistance first appeared in Lolium rigidum in an apple orchard in Australia in 1996, ironically the year that the first glyphosate-resistant crop (soybean) was introduced in the USA. Thirty-eight weed species have now evolved resistance to glyphosate, distributed across 37 countries and in 34 different crops and six non-crop situations. Although glyphosate-resistant weeds have been identified in orchards, vineyards, plantations, cereals, fallow and non-crop situations, it is the glyphosate-resistant weeds in glyphosate-resistant crop systems that dominate the area infested and growing economic impact. Glyphosate-resistant weeds present the greatest threat to sustained weed control in major agronomic crops because this herbicide is used to control weeds with resistance to herbicides with other sites of action, and no new herbicide sites of action have been introduced for over 30 years. Industry has responded by developing herbicide resistance traits in major crops that allow existing herbicides to be used in a new way. However, over reliance on these traits will result in multiple-resistance in weeds. Weed control in major crops is at a precarious point, where we must maintain the utility of the herbicides we have until we can transition to new weed management technologies. © 2017 Society of Chemical Industry.

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Section: Weed Familiesmentioning

confidence: 99%

“…Salsota tragus is also a tumbleweed, and glyphosate-resistant S. tragus has only recently been identified in isolated populations in Montana and Oregon. 18,19 It will be interesting to see if its dispersal mechanism will provide it with rapid spread like that of Kochia.…”

Section: Chenopodiaceaementioning

confidence: 99%

Overview of glyphosate‐resistant weeds worldwide

Heap¹,

Duke

2017

Pest Management Science

393

287

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“…The development and spread of glyphosate-resistant Russian thistle in the Pacific Northwest (Barroso et al 2018;Kumar et al 2017) is causing growers to find alternatives to glyphosate for Russian thistle control in fallow. Just as glyphosate-resistant kochia has growers in the US Great Plains using soil-residual herbicides as the foundation of kochia control (Kumar and Jha 2015), growers in eastern Oregon and Washington should consider soilresidual herbicides for Russian thistle control.…”

Section: Tumble Mustard and Prickly Lettucementioning

confidence: 99%

“…Those who practice no-till fallow typically use repeated applications of glyphosate to control Russian thistle (Lutcher 2015). This weed control strategy is less effective than it once was because of ongoing development of resistance to glyphosate (Barroso et al 2018;Kumar et al 2017). This problem, which is exacerbated by long-known resistance to acetolactate synthase-inhibiting herbicides (Peterson 1999;Prather et al 2000;Saari et al 1992;Stallings et al 1994) and suspected resistance to triazine herbicides (Holt and Lebaron 1990;Warwick et al 2010), may be a precursor to the gradual decline of no-till fallow.…”

Section: Introductionmentioning

confidence: 99%

Russian thistle (Salsola tragus L.) control with soil-active herbicides in no-till fallow

et al. 2021

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The benefits of no-till fallow, which include reduced soil erosion, improved soil health, and increased stored soil water, are in jeopardy because of the widespread development of glyphosate resistance in Russian thistle. The objective of this research was to evaluate the efficacy of soil-active, residual herbicides for Russian thistle control in no-till fallow. The combinations of sulfentrazone + carfentrazone and flumioxazin + pyroxasulfone, and metribuzin alone were each applied in late fall, late winter, and split-applied in late fall and late winter at three sites: Adams, OR, in 2017–2018; Lind, WA, in 2018–2019; and Ralston, WA, in 2019–2020. All treatments provided good to excellent control of the initial flush of Russian thistle when assessed in mid-May, except the late-fall application of metribuzin at all three sites, and the late-fall application of sulfentrazone + carfentrazone at Adams. Cumulative Russian thistle densities, evaluated monthly throughout the fallow season, were lowest for the sulfentrazone + carfentrazone treatments, except for the late-fall application at Adams. However, flumioxazin + pyroxasulfone and metribuzin provided greater control of tumble mustard and prickly lettuce than did sulfentrazone + carfentazone. Sulfentrazone + carfentrazone, flumioxazin + pyroxasulfone, and metribuzin can all be used for Russian thistle control in fallow. To reduce the risk for crop injury to subsequently planted winter wheat, a late-fall application of sulfentrazone + carfentrazone may be the preferred treatment in low-rainfall regions where winter wheat–fallow is commonly practiced. A late-winter application may be preferred in higher rainfall regions where a 3-year rotation (e.g., winter wheat–spring wheat–fallow) is common. Flumioxazin + pyroxasulfone should be considered if other broadleaf weeds, such as tumble mustard or prickly lettuce, are of concern. The use of these soil-applied herbicides will reduce the need for the frequent application of glyphosate for Russian thistle control in no-till fallow.

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“…5 Eight of the research papers in this issue are on evolved glyphosate resistance. [6][7][8][9][10][11][12][13] Two of these are on a new mechanism of resistance -the "phoenix phenomenon", in which the parts of the plant that directly receive glyphosate spray are rapidly killed, preventing translocation of glyphosate to meristems from which the plant regrows (like a phoenix). 6,7 The cover of this issue illustrates the phenomenon.…”

Section: Glyphosate: the World's Most Successful Herbicide Under Intementioning

confidence: 99%

Glyphosate: The world's most successful herbicide under intense scientific scrutiny

Duke¹

2018

Pest Management Science

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Identification of glyphosate resistance in Salsola tragus in north‐eastern Oregon

Abstract: Glyphosate resistance in S. tragus highlights the imperative need to diversify weed control strategies to preserve the longevity and sustainability of herbicides in semi-arid cropping systems of the Pacific Northwest. © 2017 Society of Chemical Industry.

Cited by 18 publications

References 22 publications

Overview of glyphosate‐resistant weeds worldwide

Overview of glyphosate‐resistant weeds worldwide

Russian thistle (Salsola tragus L.) control with soil-active herbicides in no-till fallow

Glyphosate: The world's most successful herbicide under intense scientific scrutiny

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