The response of <i>Bromus diandrus</i> and <i>Lolium rigidum</i> to dalapon and glyphosate I: baseline sensitivity

Barroso, Judit; Loureiro, Íñigo; Escorial, María Concepción; Chueca, María Cristina

doi:10.1111/j.1365-3180.2010.00782.x

Cited by 9 publications

(13 citation statements)

References 30 publications

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“…Barroso et al . () collected five populations each of Lolium rigidum and Bromus diandrus Roth (ripgut brome), all with no previous glyphosate exposure, and reported I 50 values ranging between 17–46 g a.i. ha −1 and 85–117 g a.i.…”

Section: Discussionmentioning

confidence: 99%

Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides

Davies

Neve

2017

Weed Research

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SummaryGlyphosate use in the United Kingdom has more than doubled in the last 20 years. Much of this increase is driven by efforts to control herbicide resistant weeds, particularly Alopecurus myosuroides, prior to crop drilling. There is precedent for evolution of glyphosate resistance in similar situations, raising concerns over the sustainability of glyphosate use in the UK. We used dose–response experiments to examine variation in glyphosate sensitivity amongst 40 field‐collected A. myosuroides populations. No populations were resistant to glyphosate, but ED 90 values ranged between 354 and 610 g a.i. ha−1. Five populations had ED 90 values significantly higher than the unexposed control population collected from a site at Rothamsted Research with no previous glyphosate exposure. Recurrent selection experiments were performed to determine whether variation in glyphosate sensitivity had a heritable basis. Following two rounds of selection, five of six field populations evolved significantly reduced sensitivity to glyphosate, with R/S ratios, based on estimated ED 50 values, ranging from 1.2 to 1.5. These results confirm that there is a heritable basis to variation in glyphosate sensitivity. The response to selection was modest. Evolved populations were not highly resistant to glyphosate, although some twice‐selected individuals survived recommended field rates. These results do not represent definitive proof of the potential of A. myosuroides to evolve glyphosate resistance, although they do indicate caution is needed when considering the sustainability of increased glyphosate use to control this herbicide resistance‐prone species.

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Section: Discussionmentioning

confidence: 99%

Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides

Davies

Neve

2017

Weed Research

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“…Other sensitivity studies revealed factors between ED 50 's of the most and the least sensitive populations of 4.9 [15 Papaver rhoeas populations tested with florasulam in different European countries (Paterson et al ., )] and 1.4–2.7 [six Bromus diandrus Roth and five Lolium rigidum Gaudin populations tested with dalapon and glyphosate in north Spain (Barroso et al ., )]. Already in 1975, genetic variation of T. inodorum to MCPA was investigated in populations coming from southern Britain and northern France (Ellis & Kay, ).…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, the level of non-target-site resistance can be rather low, which makes it difficult to separate low non-target-site resistance from the background variability in sensitivity. Baseline and sensitivity monitoring are essential in resistance management (Ulber et al, 2013), but few data are available in the scientific literature (Paterson et al, 2002;Roux et al, 2005;Barroso et al, 2010).…”

Section: The European and Mediterranean Plant Protectionmentioning

confidence: 99%

Intraregional and inter‐regional variability of herbicide sensitivity in common arable weed populations

et al. 2015

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The question on intraregional versus inter-regional variability in herbicide sensitivity for weed populations is of major importance, both in extrapolation of model parameters and in herbicide zonal approval procedures. We hypothesised that inter-regional variability in herbicide sensitivity for field populations would be the same as intraregional variability for regions with similar climatic conditions. Seeds of field weed populations were collected in a Danish, German and Polish region. Herbicide sensitivity was tested in doseresponse experiments in the glasshouse with flufenacet and iodosulfuron (Apera spica-venti), florasulam and tribenuron (Tripleurospermum inodorum), diflufenican, diflufenican + flurtamone and pendimethalin (Viola arvensis). ED 50 values and variance components of the ED 50 values were estimated to describe the influence of region, year and population. The regions accounted for a maximum of 26% of the variance and always less than the variance accounted for by individual populations. Sensitivity indices (SI 50 ) were calculated as the ratio between ED 50 of the test population and a reference population. There was considerable intraregional variability in SI 50 values and SI 50 values from a single region did not consistently differ from other regions. The large intraregional variability in herbicide sensitivity between populations, with no evidence of resistance, is of interest both for zonal evaluation of herbicides and resistance research. For practical weed management, we conclude that dose-response functions can be transferred between the study regions, for example for the common use in decision support systems with proper insurance for the control of less sensitive populations.

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“…As defined in the EPPO standard, data on the sensitivity variation among weed populations can only be considered as a baseline if they are obtained from populations that have never been exposed to the herbicide or to related active substances with the same mode of action. Baseline sensitivity data can be generated before the initial introduction of a herbicidal active substance, therefore allowing the evaluation of changes in sensitivity to the herbicide and thus the detection, at an early stage, of any trend towards resistance , . This is especially important for the detection of non‐target‐site resistance where resistance evolves as a slow (‘creeping’) shift of increased mean resistance level with each subsequent generation .…”

Section: Expectations Versus Reality— Sensitivity Data In the Europeamentioning

confidence: 99%

Resistance risk assessment within herbicide authorisation – a call for sensitivity data

Ulber

Nordmeyer

Zwerger

2012

Pest Management Science

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In most European countries, the risk of herbicide resistance is assessed as part of the authorisation of herbicides in accordance with EPPO Standard PP 1/213(2). Because the susceptibility of weed populations to a certain herbicide may vary greatly, one part of resistance risk assessment is the testing for sensitivity variation among different populations of target weed species with a high resistance risk. This paper emphasises the importance of sensitivity data provision with regard to the recent EU Regulation (EC) 1107/2009 concerning the placing of plant protection products on the market and outlines the main technical requirements for sensitivity data. A useful principle is that sensitivity data should be provided for all herbicides with a high resistance risk regardless of whether resistance has already evolved against the herbicidal substance. Methodical details regarding the generation of sensitivity data are discussed, together with remaining questions that will need to be addressed if a harmonised assessment of herbicide resistance risk is to be achieved. Copyright © 2012 Society of Chemical Industry

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The response of Bromus diandrus and Lolium rigidum to dalapon and glyphosate I: baseline sensitivity

Cited by 9 publications

References 30 publications

Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides

Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides

Intraregional and inter‐regional variability of herbicide sensitivity in common arable weed populations

Resistance risk assessment within herbicide authorisation – a call for sensitivity data

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