Alternative Herbicides for the Control of Clethodim-Resistant Rigid Ryegrass (<i>Lolium rigidum</i>) in Clearfield Canola in Southern Australia

Saini, Rupinder Kaur; Kleemann, Samuel G. L.; Preston, Christopher; Gill, Gurjeet

doi:10.1614/wt-d-15-00078.1

Cited by 5 publications

(7 citation statements)

References 17 publications

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“…This study indicates a significantly lower frequency of resistance to butroxydim (approx. 40%), in agreement with other studies showing the ability of butroxydim to control clethodim‐resistant field populations of L. rigidum (Saini et al ., 2015a, 2016). The overall survival to the mixture of clethodim + butroxydim, despite tending to be the lowest, was not significantly lower than to butroxydim (Figure 1).…”

Section: Discussionmentioning

confidence: 99%

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Are herbicide mixtures unaffected by resistance? A case study with Lolium rigidum

Busi

Beckie

2020

Weed Research

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Crop pests (weeds, pathogens and insects) have rapidly evolved resistance in response to the intense selection imposed by pesticide use in agriculture (Hawkins et al., 2019). The evolution of resistance to herbicides in weed populations is directly linked to their recurrent exposure to herbicide selection (Neve and Powles, 2005a; Neve and Powles, 2005b). Several empirical studies investigating the underlying principles of population genetics, ecology and evolution suggest a greater risk of resistance selection when pesticides are alternated (i.e. rotation) instead of used in combination (sequences, mixtures)

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Section: Discussionmentioning

confidence: 99%

“…showing the ability of butroxydim to control clethodim-resistant field populations of L. rigidum (Saini et al, 2015a(Saini et al, , 2016. The overall survival to the mixture of clethodim + butroxydim, despite tending to be the lowest, was not significantly lower than to butroxydim (Figure 1).…”

Section: Greater Efficacy Of Post Mixturesmentioning

confidence: 97%

Are herbicide mixtures unaffected by resistance? A case study with Lolium rigidum

Busi

Beckie

2020

Weed Research

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“…Overall, in Australian grain cropping systems, herbicides of distinct groups are often used in tandem and applied sequentially to target annual ryegrass from pre-sowing to seedset [ 51 , 95 ]. Also, there has been a trend of using herbicide mixtures and rotating herbicides from different modes of action within or between seasons to control annual ryegrass and to delay the evolution of herbicide resistance [ 94 , 96 , 97 ].…”

Section: Managementmentioning

confidence: 99%

The Remarkable Journey of a Weed: Biology and Management of Annual Ryegrass (Lolium rigidum) in Conservation Cropping Systems of Australia

Bajwa

Latif

Borger³

et al. 2021

Plants

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Annual ryegrass (Lolium rigidum Gaud.), traditionally utilised as a pasture species, has become the most problematic and difficult-to-control weed across grain production regions in Australia. Annual ryegrass has been favoured by the adoption of conservation tillage systems due to its genetic diversity, prolific seed production, widespread dispersal, flexible germination requirements and competitive growth habit. The widespread evolution of herbicide resistance in annual ryegrass has made its management within these systems extremely difficult. The negative impacts of this weed on grain production systems result in annual revenue losses exceeding $93 million (AUD) for Australian grain growers. No single method of management provides effective and enduring control hence the need of integrated weed management programs is widely accepted and practiced in Australian cropping. Although annual ryegrass is an extensively researched weed, a comprehensive review of the biology and management of this weed in conservation cropping systems has not been conducted. This review presents an up-to-date account of knowledge on the biology, ecology and management of annual ryegrass in an Australian context. This comprehensive account provides pragmatic information for further research and suitable management of annual ryegrass.

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“…Very high levels of ACCase resistance (>95% diclofop resistance) were reported a decade ago in WA and the frequency of clethodim resistance remains substantially unchanged 12,14,36,51 . As the frequency of resistance to the mixture of clethodim + butroxydim was often significantly reduced across a large number of L. rigidum populations, it appears logical to recommend resistance testing and adoption of mixtures of ACCase herbicides (dims and fops) permitted by labels that can deliver cost‐effective solutions for the control of L. rigidum in break (nonwheat) crops 52,53 …”

Section: Discussionmentioning

confidence: 99%

“…12,14,36,51 As the frequency of resistance to the mixture of clethodim + butroxydim was often significantly reduced across a large number of L. rigidum populations, it appears logical to recommend resistance testing and adoption of mixtures of ACCase herbicides (dims and fops) permitted by labels that can deliver cost-effective solutions for the control of L. rigidum in break (nonwheat) crops. 52,53 In Australia, the rapid increase of resistance to wheat-selective POST herbicides in L. rigidum has resulted in greater adoption of PRE herbicides such as prosulfocarb, pyroxasulfone, triallate and trifluralin. 22 The recent introduction of new active ingredients (e.g.…”

Section: Distribution Of Herbicide Resistance In Australiamentioning

confidence: 99%

Herbicide resistance across the Australian continent

Busi

Beckie

Bates³

et al. 2021

Pest Management Science

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BACKGROUND Lolium rigidum is the weed of greatest economic impact in Australia due to its formidable capacity to evolve herbicide resistance. In this study, 579 field‐sampled L. rigidum populations were tested for resistance to 21 herbicides applied at the recommended rate. Nine herbicide treatments were binary mixtures. RESULTS A total of 15 876 individual resistance tests were conducted by screening two million seeds at the recommended label rate. The overall frequency of resistant populations was 31%, 14%, 71%, 6% and 0% in response to the post‐emergence herbicide treatments clethodim, clethodim + butroxydim, imazamox + imazapyr, glyphosate and paraquat, respectively. The resistance frequency to stand‐alone pre‐emergence wheat‐selective herbicides ranged from 10% to 34%. Conversely, the levels of resistance to pre‐emergence mixtures or stand‐alone propyzamide were significantly lower, ranging from 6% to 0%. In winter, the responses to glyphosate, paraquat, cinmethylin, prosulfocarb, pyroxasulfone and trifluralin were reassessed, with 7%, 0%, 0%, 21%, 21% and 28% as the respective resistance frequencies. South Australia and Victoria are identified as epicenters for L. rigidum population resistance to pyroxasulfone, whereas populations in New South Wales have the greatest resistance to glyphosate and in Western Australia to clethodim. CONCLUSIONS For the first time, resistance levels to stand‐alone herbicides and binary mixtures are geographically ranked across the Australian continent by benchmark statistical analysis of resistance frequencies and distribution. The extension of these results will raise awareness of rapidly emerging patterns of herbicide resistance, encouraging the adoption of cost‐effective modes of action and integration of diverse strategies for weed resistance management.

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Alternative Herbicides for the Control of Clethodim-Resistant Rigid Ryegrass (Lolium rigidum) in Clearfield Canola in Southern Australia

Cited by 5 publications

References 17 publications

Are herbicide mixtures unaffected by resistance? A case study with Lolium rigidum

Are herbicide mixtures unaffected by resistance? A case study with Lolium rigidum

The Remarkable Journey of a Weed: Biology and Management of Annual Ryegrass (Lolium rigidum) in Conservation Cropping Systems of Australia

Herbicide resistance across the Australian continent

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