Widespread Occurrence of Herbicide-Resistant Italian Ryegrass (<i>Lolium multiflorum</i>) in Northern Idaho and Eastern Washington

Rauch, Traci A.; Thill, Donald C.; Gersdorf, Seth A.; Price, William J.

doi:10.1614/wt-d-09-00059.1

Cited by 43 publications

(52 citation statements)

References 19 publications

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“…The NC22 biotype was cross‐resistant to at least one ACCase inhibitor from each of the ‘dims’, ‘fops’, and ‘den’ families. Similar cases of Italian ryegrass cross‐resistance to ACCase inhibitors were documented in Idaho and California . In Idaho, 12% of populations tested had cross‐resistance to several ACCase inhibitors including sethoxydim, clethodim, quizalofop, and pinoxaden .…”

Section: Discussionsupporting

confidence: 52%

“…Similar cases of Italian ryegrass cross‐resistance to ACCase inhibitors were documented in Idaho and California . In Idaho, 12% of populations tested had cross‐resistance to several ACCase inhibitors including sethoxydim, clethodim, quizalofop, and pinoxaden . Two Italian ryegrass populations from California that had multiple resistance sethoxydim, paraquat and glyphosate, were cross‐resistant to fluazifop, fenoxaprop, and cyhalofop, with one population also resistant to clethodim displaying only a 14% reduction in above‐ground biomass dry weight .…”

Section: Discussionmentioning

confidence: 99%

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Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Nandula

Giacomini

Lawrence

et al. 2019

Pest Management Science

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BACKGROUND Clethodim, an acetyl‐CoA carboxylase (ACCase)‐inhibiting herbicide, is one of the few postemergence chemical control options available to growers of Mississippi to manage glyphosate and/or other herbicide resistant Italian ryegrass populations. Recently, clethodim failed to adequately control Italian ryegrass populations across Mississippi. A sethoxydim, also an ACCase inhibitor, ‐resistant Italian ryegrass population from North Carolina was cross‐resistant to clethodim. This research characterized the magnitude and mechanisms of clethodim resistance in the Mississippi and North Carolina Italian ryegrass populations via whole‐plant herbicide dose response, cross resistance, and metabolism studies, and molecular analysis. RESULTS Two clethodim‐resistant biotypes from Mississippi, MS24 and MS37, were 10‐ and 4‐fold resistant, respectively, relative to a susceptible (SUS1) biotype. A North Carolina biotype, NC21, was 40‐fold resistant to clethodim compared to SUS1. Two additional biotypes from North Carolina, NC22 and NC 23, recorded shoot dry weight reduction of only 17–30% of nontreated at the highest clethodim dose of 2.17 kg ha−1, (8×). The NC22 biotype was cross‐resistant to sethoxydim, fluazifop, quizalofop, and pinoxaden. Metabolic inhibitors such as piperonyl butoxide and 4‐chloro‐7‐nitrobenzofurazan did not affect resistance of MS37, MS51, and NC22 biotypes to fenoxaprop, clethodim, or pinoxaden. The MS37 biotype had three target site mutations, I2041N, C2088R, and G2096A. Another clethodim‐resistant biotype from Mississippi, MS51, had only the C2088R substitution. The NC22 and NC23 biotypes had I1781L, I2041N, and D2078G replacements. CONCLUSION This study shows that the mechanism of resistance to clethodim in Italian ryegrass from Mississippi and North Carolina is due to target site modifications in the ACCase gene leading to broad cross‐resistance to other ACCase‐inhibiting herbicides. Published 2019. This article is a U.S. Government work and is in the public domain in the USA.

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Section: Discussionsupporting

confidence: 52%

Section: Discussionmentioning

confidence: 99%

Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Nandula

Giacomini

Lawrence

et al. 2019

Pest Management Science

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“…Resistance to clomazone was identified in Australian rigid ryegrass populations never exposed to clomazone (Tardiff and Powles 1999). Additionally, Rauch et al (2010) reported that 12% of Italian ryegrass populations collected from 75 fields in the Palouse region of Idaho and Washington exhibited resistance to a prepackaged mixture of flufenacet plus metribuzin. S-metolachlor has a similar mode of action to flufenacet.…”

Section: Resultsmentioning

confidence: 99%

Glyphosate-Resistant Italian Ryegrass (Lolium perennessp.multiflorum) Control with Fall-Applied Residual Herbicides

et al. 2014

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Dense populations of glyphosate-resistant (GR) Italian ryegrass are problematic for spring burndown herbicide programs and crop establishment in the midsouthern United States. Two field studies were conducted to evaluate fall-applied residual herbicides for control of GR Italian ryegrass and to identify the most effective application timing for these herbicides. Fall applications of clomazone at 0.84 and 1.12 kg ai ha−1, pyroxasulfone at 0.16 kg ai ha−1, andS-metolachlor at 1.79 kg ai ha−1controlled GR Italian ryegrass ≥ 93% 180 d after application. Control from incorporated applications of pendimethalin at 1.59 kg ai ha−1and trifluralin at 1.68 kg ai ha−1and surface applications ofS-metolachlor at 1.42 kg ha−1provided control similar to the best treatments. Glyphosate-resistant Italian ryegrass control following clomazone, pyroxasulfone,S-metolachlor, or trifluralin applied in mid September, October, or November exceeded that from fall tillage by 19 to 56% at 90 and 140 d after the last treatment. Pyroxasulfone andS-metolachlor controlled more GR Italian ryegrass following October or November applications compared with those in September at both 90 and 140 d after the last application timing. However, the benefit of delaying clomazone application from October to November was not realized until the last evaluation (140 d after the last treatment). Clomazone, pyroxasulfone, andS-metolachlor offer growers the best opportunity for residual control of GR Italian ryegrass, and control is optimized when these herbicides are applied in November.

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“…In studies that evaluated the resistance of ryegrass to this mechanism of action, resistance to the herbicide clethodim was observed when it was applied at the dose of 96 g a.i. ha -1 (Rauch et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

Dose-response curves of Lolium multiflorum biotypes resistant and susceptible to clethodim

et al. 2013

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-Chemical control with herbicides, especially glyphosate, is the main method used to control ryegrass. However, the repeated use of glyphosate has selected resistant ryegrass biotypes. Thus, the ACCase inhibitor herbicides have become the main alternative to control glyphosate-resistant biotypes, being widely used by farmers in Rio Grande do Sul. Repeated use of ACCase inhibitors, in turn, have selected ryegrass biotypes resistant to this herbicide mechanism. Thus, the objective of this study was to evaluate the response of ryegrass biotypes to different clethodim rates by dose-response curves. Increasing doses (0, 12, 24, 48, 72, 96, 144 and 192 g a.i. ha -1 ) of the herbicide clethodim were applied at the 3-4 ryegrass leaf stage. The variables control at 14 and 28 days after treatment (DAT) and shoot dry weight were evaluated. The data were fitted by nonlinear regression log-logistic and C 50 and GR 50 were calculated based on the equation. The resistance factor was obtained by the ratio of C 50 or GR 50 of the resistant biotype by matching the susceptible biotype. Based on the equation parameters, the doses of GR 50 64.7 and 234.5 g a.i. ha clethodim were obtained, at 28 DAT for the susceptible and resistant biotypes, respectively. The ryegrass biotype denominated Cotril is resistant to clethodim, being controlled with a dose 15.3 times greater than that of the susceptible biotype, and a 50% reduction of this biotype occurs with a dose 3.62 times higher than that of the susceptible one.Keywords: ryegrass, cyclohexanodiones, herbicide resistance. (0, 12, 24, 48, 72, 96, 144 e 192 RESUMO -

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Widespread Occurrence of Herbicide-Resistant Italian Ryegrass (Lolium multiflorum) in Northern Idaho and Eastern Washington

Cited by 43 publications

References 19 publications

Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Glyphosate-Resistant Italian Ryegrass (Lolium perennessp.multiflorum) Control with Fall-Applied Residual Herbicides

Dose-response curves of Lolium multiflorum biotypes resistant and susceptible to clethodim

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