scholarly journals First Report on Assessing the Severity of Herbicide Resistance to ACCase Inhibitors Pinoxaden, Propaquizafop and Cycloxydim in Six Avena fatua Populations in Ireland

Agronomy ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1362
Author(s):  
Vijaya Bhaskar Alwarnaidu Vijayarajan ◽  
Patrick D. Forristal ◽  
Sarah K. Cook ◽  
Jimmy Staples ◽  
David Schilder ◽  
...  
Keyword(s):  
Weed Control ◽  
Herbicide Resistance ◽  
Avena Fatua ◽  
Crop Rotations ◽  
Effective Control ◽  
Cross Resistance ◽  
Variable Cross ◽  
Wild Oats ◽  
Rf Values ◽  
Susceptible Populations

In response to growers reports of poor weed control, resistance to ACCase inhibitors pinoxaden, propaquizafop and cycloxydim was investigated in populations of six wild oats, Avena fatua, collected from cereal-dominated crop rotations in Ireland. Glasshouse assays confirmed reduced sensitivity to all three ACCase inhibitors in four of the six populations, R2 to R5. R1 was cross-resistant to pinoxaden and propaquizafop and R6 was resistant to propaquizafop only. Dose-response studies confirmed significant differences in the severity of resistance amongst these populations (p < 0.05). For pinoxaden, the ED50 or GR50 resistance factor (RF) of R1, R3 and R5 were between 11.6 and 13.1 times or 25.1 and 30.2 times more resistant, respectively, compared with the susceptible populations. For propaquizafop, the ED50 and GR50 RF of R1, R2, R3, R5 and R6 were between >7.8 and >32 or 16.6 and 59 times more resistant, respectively. For cycloxydim, only R5 had both high ED50 and GR50 RF values of >43.2 and 98.4 respectively. In R2, although the ED50 values to both pinoxaden and cycloxydim and additionally, R3 to cycloxydim, were above recommended field rates, their GR50 values remained below, suggesting a shift towards cross-resistance. While R4 was the only population, where both ED50 and GR50 for all ACCase inhibitors remained below recommended field rates, they would not give effective control at these rates, strongly indicating evolving resistance. This is the first study reporting variable cross-resistance types and levels to ACCase inhibitors in A. fatua from Ireland.

scholarly journals The occurrence of herbicide-resistant Avena fatua (wild oats) populations to ACCase-inhibiting herbicides in Ireland

2021 ◽  
Author(s):  
R. Byrne ◽  
A.V. Vijaya Bhaskar ◽  
J. Spink ◽  
R. Freckleton ◽  
P. Neve ◽  
...  
Keyword(s):  
Herbicide Resistance ◽  
Weed Management ◽  
Resistance Mechanism ◽  
Point Mutations ◽  
Acetolactate Synthase ◽  
Avena Fatua ◽  
Integrated Weed Management ◽  
Cross Resistance ◽  
Wild Oats ◽  
Als Inhibitor

Following growers’ reports of herbicide control problems, populations of 30 wild oats, Avena fatua, were collected from the south-east main arable counties of Ireland in 2016 and investigated for the occurrence and potential for herbicide resistance to acetyl-CoA carboxylase (ACCase) inhibitors pinoxaden, propaquizafop and cycloxydim, as well as acetolactate synthase (ALS) inhibitor mesosulfuron + iodosulfuron. Plant survival ≥20% was considered as the discriminating threshold between resistant and susceptible populations, when plants were treated with full recommended field rates of ACCase/ALS inhibitors. Glasshouse sensitivity screens revealed 2 out of 30 populations were cross-resistant to all three ACCase inhibitors. While three populations were cross-resistant to both pinoxaden and propaquizafop, and additionally, two populations were resistant to propaquizafop only. Different degree of resistance and cross-resistance between resistant populations suggest the involvement of either different point mutations or more than one resistance mechanism. Nevertheless, all populations including the seven ACCase-resistant populations were equally susceptible to ALS inhibitor. An integrated weed management (cultural/non-chemical control tactics and judicious use of herbicides) approach is strongly recommended to minimize the risk of herbicide resistance evolution.

scholarly journals Herbicide resistance in the Canadian prairie provinces : Five years after the fact

2005 ◽  
Vol 75 (4) ◽  
pp. 5-16 ◽  
Author(s):  
I.N. Morrisson ◽  
M.D. Devine
Keyword(s):  
Herbicide Resistance ◽  
Effective Control ◽  
Cross Resistance ◽  
Multiple Resistance ◽  
Canadian Prairie ◽  
Wild Oats ◽  
Wild Mustard ◽  
Green Foxtail ◽  
Group 2 ◽  
Group 1

Herbicide resistance was first recognized as a problem on the Canadian Prairies in 1988 when trifluralin-resistant green foxtail (Setaria viridis) was reported in Manitoba, and chlorsulfuron-resistant chickweed (Stellaria media) and koehia (Kochia scoparia) in Alberta and Saskatchewan, respectively. Since then, the number of resistant weeds has increased to include wild oats (Avena fatua) resistant to triallate and to aryloxyphenoxypropionate and cyclohexanedione (group 1) herbicides, green foxtail to group 1 herbicides, Russian thistle (Salsola pestifer) and wild mustard (Sinapis arvensis) to sulfonylurea and imidazolinone (group 2) herbicides, and wild mustard to growth regulator (group 4) herbicides. The levels and patterns of cross-resistance to chemicals in groups 1 and 2 vary widely among different populations, with resistance factors [resistant to susceptible (R:S) ratios] derived from dose response curves typically ranging from < 2 to > 150. Group 1 resistance in green foxtail and group 2 resistance in chickweed and kochia populations are due to reduced sensitivities of the target enzymes, acetyl coenzyme-A carboxylase (ACCase) and acetolactate synthase (ALS), respectively. The mechanisms of resistance in the other species including wild oats resistant to ACCase inhibitors (group 1 ) and to triallate/difenzoquat (group 8) are unclear. At present, the only instance of multiple resistance in western Canada is green foxtail resistant to chemicals in both groups 1 and 3 (ACCase inhibitors and dinitroanilines). Future concerns focus mainly on the increasing seriousness of group 1 and 8 resistance across the Prairies, and on the possibility of selecting for multiple resistance in weeds such as green foxtail for which there are few remaining effective control options.

scholarly journals Have wild oats in Canterbury become resistant to herbicides

2014 ◽  
Vol 67 ◽  
pp. 331-331 ◽  
Author(s):  
K.C. Harrington ◽  
R.J. Chynoweth
Keyword(s):  
Herbicide Resistance ◽  
Avena Fatua ◽  
Wild Oats ◽  
Susceptible Populations ◽  
Two Populations

To investigate rumours that herbicide resistance has developed in wild oats (Avena fatua) seeds of this species were collected from eight arable farms (either one or two populations per farm) in Canterbury from which possible resistance to either fenoxapropPethyl or haloxyfop had been reported Seeds were also obtained from two properties where no resistance was thought to exist Seeds from these 14 populations were germinated using dormancybreaking techniques and established individually in pots within a glasshouse in October 2013 When seedlings were 4 weeks old they were sprayed with the recommended rate of fenoxapropPethyl haloxyfop or flampropMisopropyl None of the populations were controlled adequately by flampropMisopropyl because insufficient competition was exerted on the seedlings following application as required to make this herbicide work well One of the 14 populations was poorly controlled by all three herbicides suggesting it has developed resistance to these herbicides The remaining populations were adequately controlled by fenoxapropPethyl and haloxyfop However seedlings of one of these susceptible populations were not treated with fenoxaprop Pethyl until they were 6 weeks old and these were not controlled showing the importance of applying this herbicide early enough while seedlings are still susceptible

scholarly journals Evaluation of Herbicide-Resistance Status on Populations of Littleseed Canarygrass (Phalaris Minor Retz.) from Southern Greece and Suggestions for their Effective Control

2012 ◽  
Vol 52 (3) ◽  
pp. 308-313 ◽  
Author(s):  
Ilias Travlos
Keyword(s):  
Herbicide Resistance ◽  
Resistance Index ◽  
Acetolactate Synthase ◽  
Effective Control ◽  
Cross Resistance ◽  
Resistance Mutations ◽  
Resistance Level ◽  
Phalaris Minor ◽  
Wide Range ◽  
Southern Greece

Evaluation of Herbicide-Resistance Status on Populations of Littleseed Canarygrass (Phalaris MinorRetz.) from Southern Greece and Suggestions for their Effective ControlIn 2010, a survey was conducted in the wheat fields of a typical cereal-producing region of Greece to establish the frequency and distribution of herbicide-resistant littleseed canarygrass (Phalaris minorRetz.). In total, 73 canarygrass accessions were collected and screened in a field experiment with several herbicides commonly used to control this weed. Most of the weed populations were classed as resistant (or developing resistance) to the acetyl-CoA varboxylase (ACCase)-inhibiting herbicide diclofop, while resistance to clodinafop was markedly lower. The results of the pot experiments showed that some of the canary populations were found to have a very high level of diclofop resistance (resistance index up to 12.4), while cross resistance with other herbicides was also common. The levels of resistance and cross resistance patterns among populations varied along with the different amounts and times of selection pressure. Such variation indicated either more than one mechanism of resistance or different resistance mutations in these weed populations. The population which had the highest diclofop resistance level, showed resistance to all aryloxyphenoxypropinate (APP) herbicides applied and non-ACCase inhibitors. Alternative ACCase-inhibiting herbicides, such as pinoxaden remain effective on the majority of the tested canarygrass populations, while the acetolactate synthase (ALS)-inhibiting herbicide mesosulfuron + iodosulfuron could also provide some solutions. Consequently, there is an opportunity to effectively control canarygrass by selecting from a wide range of herbicides. It is the integration of agronomic practices with herbicide application, which helps in effective management ofP. minorand particularly its resistant populations.

Influence of Picloram Alone or Plus 2,4-D on Control of Wild Oats (Avena fatua) with Four Postemergence Herbicides

Weed Science ◽  
1983 ◽  
Vol 31 (6) ◽  
pp. 889-891 ◽  
Author(s):  
P. Ashley O'Sullivan
Keyword(s):  
Acetic Acid ◽  
Weed Control ◽  
Broad Spectrum ◽  
Field Experiments ◽  
Avena Fatua ◽  
Propanoic Acid ◽  
Wild Oats ◽  
Commercial Mixture ◽  
Dichlorophenoxy Acetic Acid ◽  
Postemergence Herbicides

Field experiments were conducted for 2 yr to determine the influence of picloram (4-amino-3,5,6-trichloropicolinic acid) and a commercial mixture of picloram plus 2,4-D [(2,4-dichlorophenoxy)acetic acid] (1:16, w/w) on control of wild oats (Avena fatua L. # AVEFA) with four postemergence herbicides. The phytotoxicity to wild oats of barban (4-chloro-2-butynyl m-chlorocarbanilate) or difenzoquat (1,2-dimethyl-3,5-diphenyl-1H-pyrazolium) in 1981 and diclofop {2-[4-(2,4-dichlorophenoxy)-phenoxy] propanoic acid} or flamprop [N-benzoyl-N-(3-chloro-4-fluorophenyl)-DL-alanine] in 1981 and 1982 was reduced when these herbicides were applied in a mixture with picloram plus 2,4-D. Consequently, the use of these mixtures for broad-spectrum weed control in one spray operation is not recommended. Picloram applied at a rate equivalent to the amount present in the picloram plus 2,4-D mixture did not influence the control of wild oats obtained with any herbicide, indicating that the antagonism was due to the 2,4-D component of the picloram plus 2,4-D mixture.

INFLUENCE OF METRIBUZIN AND CYANAZINE ON THE PHYTOTOXICITY OF GRAMINICIDES ON WILD OATS AND BARLEY

1989 ◽  
Vol 69 (1) ◽  
pp. 195-203 ◽  
Author(s):  
K. J. KIRKLAND ◽  
K. N. HARKER ◽  
P. A. O’SULLIVAN
Keyword(s):  
Hordeum Vulgare ◽  
Weed Control ◽  
Avena Fatua ◽  
Hordeum Vulgare L ◽  
Wild Oats ◽  
Wild Mustard ◽  
Quizalofop Ethyl

Tank-mixes of metribuzin or cyanazine with sethoxydim, fluazifop-p-butyl, haloxyfop-methyl or quizalofop-ethyl were evaluated at Scott, Saskatchewan and Lacombe, Alberta for control of wild oats (Avena fatua L.) and barley (Hordeum vulgare L.). Metribuzin reduced the control of wild oats and barley when mixed with the four graminicides. Mixtures of the graminicides with cyanazine were not antagonistic and there was no loss of weed control. The addition of fluazifop-p-butyl, haloxyfop-methyl, and quizalofop-ethyl to metribuzin caused reduced phytotoxicity on wild mustard in the growth room.Key words: Graminicides, antagonism, metribuzin, cyanazine

Decoding Non-Target-Site Herbicide Resistance in Sunflower: The Beginning of the Story

Helia ◽  
2019 ◽  
Vol 42 (70) ◽  
pp. 1-16
Author(s):  
Mercedes Gil ◽  
Graciela Nestares
Keyword(s):  
Weed Control ◽  
Herbicide Resistance ◽  
Weed Management ◽  
Management Strategies ◽  
Target Site ◽  
Acetohydroxyacid Synthase ◽  
Cross Resistance ◽  
Resistance To Herbicides ◽  
Transgenic Technologies ◽  
New Compounds

AbstractIn the last years, many efforts have been made to develop sunflower cultivars showing important agronomical characteristics such as herbicide resistance. These approaches have been focused mainly on resistance to herbicides with the same mode of action, that is acetohydroxyacid synthase (AHAS) inhibitors. To date, four induced and natural AHAS mutations have been found that confer resistance to these herbicides and many of these alleles are being used for the production of sunflower hybrids resistant to herbicides and to develop different non-transgenic technologies for weed control. However, little is known about the bases of non-target-site-based resistance (NTSR) developing cross-resistance to herbicides with different modes of action in sunflower. These mechanisms diminish the number of active herbicide molecules that reach the target and are generally polygenic. Elucidating the nature of NTSR would allow evaluating maximal efficiency conditions for the herbicide and would enable to establish weed management strategies in sunflower crop. Nowadays, mining of NTSR genes can be more easily accomplished taking advantage of up-to-date omics-based approaches: high-throughput techniques involving genomics, transcriptomics, proteomics and metabolomics. Considering the difficulties in the discovery of new compounds with a broad spectrum of weed control, it results essential to broaden the use of former herbicides which are highly efficient and ecologically desirable. Full understanding of NTSR mechanisms in sunflower would allow detecting specific genes potentially useful as biotechnological tools for the phytoremediation of herbicides and modern plant breeding.

Buckhorn plantain (Plantago lanceolata) resistant to 2,4-D in Pennsylvania and alternative control options

2020 ◽  
pp. 1-7
Author(s):  
Travis R. Russell ◽  
Tim T. Lulis ◽  
Brian A. Aynardi ◽  
Kaiyuan T. Tang ◽  
John E. Kaminski
Keyword(s):  
Herbicide Resistance ◽  
Dose Response ◽  
Field Experiments ◽  
Plantago Lanceolata ◽  
Application Rate ◽  
Field Resistance ◽  
Cross Resistance ◽  
Weed Species ◽  
Synthetic Auxin ◽  
Susceptible Populations

Abstract Buckhorn plantain populations purportedly resistant to 2,4-D were identified in Pennsylvania following long-term, continual applications of the active ingredient to turfgrass. The research objectives of this study were to 1) confirm 2,4-D resistance with dose-response experiments, 2) confirm field resistance of buckhorn plantain to 2,4-D in Pennsylvania, and 3) evaluate alternative herbicides for 2,4-D-resistant buckhorn plantain. Greenhouse dose-response experiments evaluated the sensitivity of buckhorn plantain biotypes that were resistant or susceptible to 2,4-D, and to halauxifen-methyl, two synthetic auxin herbicides from different chemical families. The resistant biotype was ≥11.3 times less sensitive to 2,4-D than the susceptible biotype and required a 2,4-D dosage ≥4.2 times greater than the standard application rate to reach 50% necrosis. No cross-resistance was observed to halauxifen-methyl because both resistant and susceptible populations demonstrated similar herbicide sensitivity. Field experiments confirmed previous reports of ineffectiveness (≤30% reduction) with 2,4-D and other phenoxycarboxylic herbicides in potentially resistant buckhorn plantain biotypes. Treatments containing halauxifen-methyl resulted in a ≥70% reduction in resistant biotypes. This is the first known report of synthetic auxin herbicide resistance in any weed species in Pennsylvania and highlights emerging herbicide resistance challenges in turfgrass systems.

scholarly journals The world’s first glyphosate-resistant case of Avena fatua L. and Avena sterilis ssp. ludoviciana (Durieu) Gillet & Magne and alternative herbicide options for their control

PLoS ONE ◽  
2022 ◽  
Vol 17 (1) ◽  
pp. e0262494
Author(s):  
Bhagirath Singh Chauhan
Keyword(s):  
Growth Stage ◽  
Avena Fatua ◽  
Effective Control ◽  
Grass Species ◽  
Avena Sterilis ◽  
Northeast Region ◽  
Wild Oats ◽  
Winter Crops ◽  
Series Of Experiments

Avena fatua and A. ludoviciana (commonly known as wild oats) are the most problematic winter grass species in fallows and winter crops in the northeast region of Australia. A series of experiments were conducted to evaluate the performance of glyphosate and alternative post-emergence herbicides on A. fatua and A. ludoviciana. This study reports the world’s first glyphosate-resistant (GR) biotypes of A. fatua and A. ludoviciana. The glyphosate dose required to kill 50% of the plants (LD50) and to reduce 50% of the biomass (GR50) for the GR biotype of A. fatua was 556 g a.e./ha and 351 g a.e./ha, respectively. These values for A. ludoviciana were 848 g a.e./ha and 289 g a.e./ha. Regardless of the growth stage (3–4 or 6–7 leaf stages), clethodim (120 g a.i./ha), haloxyfop (78 g a.i./ha), pinoxaden (20 g a.i./ha), and propaquizafop (30 g a.i./ha) were the best alternative herbicide options for the control of A. fatua and A. ludoviciana. The efficacy of butroxydim (45 g a.i./ha), clodinafop (120 g a.i./ha), imazamox + imazapyr (36 g a.i./ha), and paraquat (600 g a.i./ha) reduced at the advanced growth stage. Glufosinate (750 g a.i./ha), flamprop (225 g a.i./ha), and pyroxsulam + halauxifen (20 g a.i./ha) did not provide effective control of Avena species. This study identified alternative herbicide options to manage GR biotypes of A. fatua and A. ludoviciana.

CONTROL OF WILD OATS, GREEN FOXTAIL AND TARTARY BUCKWHEAT WITH MIXTURES OF PROPANIL OR PROPANIL/MCPA AND POSTEMERGENCE WILD OAT HERBICIDES

1981 ◽  
Vol 61 (2) ◽  
pp. 383-390 ◽  
Author(s):  
P. A. O’SULLIVAN
Keyword(s):  
Weed Control ◽  
Growing Season ◽  
Avena Fatua ◽  
Tartary Buckwheat ◽  
Wild Oat ◽  
Setaria Viridis ◽  
Fagopyrum Tataricum ◽  
Wild Oats ◽  
Green Foxtail

The phytotoxicity of barban, diclofop, difenzoquat and flamprop to wild oats (Avena fatua L.) was reduced when these herbicides were tank-mixed with propanil or propanil/MCPA. Green foxtail (Setaria viridis L.) control with propanil and propanil/MCPA was poor. Propanil/MCPA in a tank mixture with diclofop reduced diclofop control of green foxtail. Barban in a tank mixture with propanil increased green foxtail and Tartary buckwheat (Fagopyrum tataricum L. Beauv.) control compared to propanil alone. All other tank mixtures of propanil or propanil/MCPA with the wild oat herbicides had no significant effects on green foxtail control compared with propanil or propanil/MCPA. Tartary buckwheat control with propanil was good and the wild oat herbicides (except barban) in tank mixtures with propanil did not influence Tartary buckwheat control. There was an early chlorosis of wheat following treatments containing propanil or propanil/MCPA but this disappeared later in the growing season. Because of the reduced wild oat control with tank mixtures of propanil or propanil/MCPA with barban, diclofop, difenzoquat or flamprop, use of these mixtures for broadspectrum weed control is not practical.

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