Glyphosate-Resistant Russian-thistle (<i>Salsola tragus</i>) Identified in Montana and Washington

Kumar, Vipan; Spring, John; Jha, Prashant; Lyon, Drew J.; Burke, Ian C.

doi:10.1017/wet.2016.32

Cited by 23 publications

(24 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

Overview of glyphosate‐resistant weeds worldwide

Heap¹,

Duke

2017

Pest Management Science

404

287

View full text Add to dashboard Cite

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.

show abstract

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

404

287

View full text Add to dashboard Cite

show abstract

“…Wats. ), horseweed [ Conyza canadensis (L.) Cronquist], and Russian thistle ( Salsola tragus L.) (Janak and Grichar 2016; Kumar et al 2017; Sarangi and Jhala 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of Bicyclopyrone on Triploid Watermelon in Plasticulture

et al. 2018

View full text Add to dashboard Cite

Field studies were conducted to determine watermelon tolerance and yield response when treated with bicyclopyrone preplant (PREPLANT), POST, and POST-directed (POST-DIR). Treatments consisted of two rates of bicyclopyrone (37.5 and 50 g ai ha–1), fomesafen (175 g ai ha–1), S-metolachlor (802 g ai ha–1), and a nontreated check. Preplant treatments were applied to formed beds 1 d prior to transplanting and included bicyclopyrone (37.5 and 50 g ha–1) and fomesafen (175 g ha–1), and new polyethylene mulch was subsequently laid above treated beds. POST and POST-DIR treatments were applied 14 ± 1 d after watermelon transplanting and included bicyclopyrone (37.5 and 50 g ha–1) POST and POST-DIR, and S-metolachlor (802 g ai ha–1) POST-DIR. POST-DIR treatments were applied to row middles, ensuring that no herbicide contacted watermelon vines or polyethylene mulch. At 2 wk after transplanting (WAT), 15% foliar bleaching was observed in watermelon treated with bicyclopyrone (50 g ha–1) PRE. At 3 WAT, bicyclopyrone (37.5 and 50 g ha–1) POST caused 16% and 17% foliar bleaching and 8% and 9% crop stunting, respectively. At 4 WAT, initial injury had subsided and bicyclopyrone (37.5 and 50 g ha–1) POST caused 4% and 4% foliar bleaching and 4% and 8% crop stunting, respectively. No symptoms of bleaching or stunting were observed at 6- and 8-WAT ratings. Watermelon total yield, marketable yield, total fruit number, marketable fruit number, and average fruit size were unaffected by herbicide treatments. Therefore, registration of bicyclopyrone (37.5 and 50 g ha–1) PREPLANT, POST, and POST-DIR would offer watermelon producers a safe herbicide option and a novel mode of action for weed management.

show abstract

“…in Montana and other Great Plains states (Heap 2017; Kumar et al 2015). More recently, a Russian-thistle ( Salsola tragus L.) population was confirmed resistant to glyphosate in a wheat production field in Choteau County, MT (Kumar et al 2017).…”

mentioning

confidence: 99%

Confirmation of Glyphosate-Resistant Horseweed (Conyza canadensis) in Montana Cereal Production and Response to POST Herbicides

2017

Self Cite

View full text Add to dashboard Cite

In recent years, horseweed has become an increasing problem in Montana. To confirm and characterize the level of glyphosate resistance, seeds were collected from putative glyphosate-resistant (GR) horseweed (GR-MT) plants in a wheat–fallow field in McCone County, MT. Known GR (GR-NE) and glyphosate-susceptible (GS-NE) horseweed accessions from Lincoln, NE, were included for comparison in dose–response and shikimate accumulation studies. Whole-plant glyphosate dose–response experiments conducted at the early- (5- to 8-cm diameter) and late- (12- to 15-cm diameter) rosette stages of horseweed indicated that GR-MT accessions had a 2.5- to 4.0-fold level of resistance to glyphosate relative to the GS-NE accession, on the basis of shoot dry weight (GR50values). The level of resistance was 3.1- to 7.9-fold on the basis of visually assessed injury estimates (I50values). At the whole-plant level, about 2.1- to 4.5-fold higher shikimate accumulation was observed in the GS-NE accession compared with the GR-MT and GR-NE accessions over a 10-d period after glyphosate was applied at 1,260 g ae ha−1. In a separate greenhouse study, all three horseweed accessions were also screened with alternate POST herbicides registered for use in wheat–fallow rotations. The majority of the tested herbicides provided ≥90% injury at the field-use rates for all three horseweed accessions 3 wk after treatment. This is the first published report on the occurrence of GR horseweed in Montana cereal production. Increased awareness and adoption of best management practices, including the use of diversified (based on multiple sites of action) herbicide programs highlighted in this study, would aid in mitigating the further spread of GR horseweed in the cereal production fields of the U.S. Great Plains.

show abstract

Glyphosate-Resistant Russian-thistle (Salsola tragus) Identified in Montana and Washington

Cited by 23 publications

References 33 publications

Overview of glyphosate‐resistant weeds worldwide

Overview of glyphosate‐resistant weeds worldwide

Effect of Bicyclopyrone on Triploid Watermelon in Plasticulture

Confirmation of Glyphosate-Resistant Horseweed (Conyza canadensis) in Montana Cereal Production and Response to POST Herbicides

Contact Info

Product

Resources

About