Variation in<i>Elymus repens</i>susceptibility to glyphosate

Espeby, Liv Å.; Fogelfors, Håkan; Sjödal, Sara; Milberg, Per

doi:10.1080/09064710.2014.901408

Cited by 2 publications

(2 citation statements)

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“…Håkansson & Wallgren [52] found that clones from Northern Sweden emerged earlier in the year and produced a higher dry weight of rhizomes during the year than clones from Central and Southern Sweden. Espeby et al [60] found a strong covariance between geographic and genetic distance among Swedish clones collected from different habitats.…”

Section: Morphological Variationmentioning

confidence: 99%

“…and most annual weeds, meaning that a large proportion of the weed problems in a field can be controlled in a single treatment. Even though there is variation in susceptibility to glyphosate between E. repens clones, so far the species has not developed resistance [60]. Automated precision weeding is likely to fundamentally change weed control in the future, but the broad-spectrum efficacy of glyphosate makes it a better candidate for this type of control than any current non-chemical method or other herbicide.…”

Section: Future Of Elymus Repens Controlmentioning

confidence: 99%

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A Review of Non-Chemical Management of Couch Grass (Elymus repens)

et al. 2020

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Couch grass (Elymus repens) is a morphologically diverse, rhizomatous, perennial grass that is a problematic weed in a wide range of crops. It is generally controlled by glyphosate or intensive tillage in the intercrop period, or selective herbicides in non-susceptible crops. The aim of this review is to determine the efficacy of non-chemical strategies for E. repens control. The review shows that indirect control measures like crop choice, subsidiary crops, and fertilizer regimes influence E. repens abundance, but usually cannot control E. repens. Defoliation (e.g., mowing) can control E. repens growth, but efficacy varies between clones, seasons, and defoliation frequencies. Tillage in the intercrop period is still the main direct non-chemical control method for E. repens and its efficacy can be increased, and negative side-effects minimized by an appropriate tillage strategy. Some new tillage implements are on the market (Kvik-up type machines) or under development (root/rhizome cutters). Alternative methods that can kill E. repens rhizomes (e.g., steaming, soil solarization, biofumigation, hot water, flooding) often have high costs or time requirements. More studies on the effect of cropping system approaches on E. repens and other perennial weeds are needed.

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Section: Morphological Variationmentioning

confidence: 99%

Section: Future Of Elymus Repens Controlmentioning

confidence: 99%

A Review of Non-Chemical Management of Couch Grass (Elymus repens)

et al. 2020

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Glyphosate sensitivity of selected weed species commonly found in maize fields

et al. 2019

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Glyphosate resistance has evolved worldwide. Glyphosate is also the most used herbicide in Spain, and current changes in herbicide usage patterns can increase the risk of glyphosate resistance development. The objective of this study was to assess the glyphosate sensitivity of different selected weed species important in Spanish maize (Zea mays L.) fields. To this end, dose–response experiments were conducted under controlled conditions in a growth chamber to examine variation in glyphosate sensitivity among populations of five grass weed species and eight broadleaf weed species that are commonly found in the maize fields in Castilla y León, the biggest maize-growing region in Spain. The glyphosate doses that caused growth reduction by 50% (GR50) were calculated for each weed population. No populations were resistant to glyphosate. In addition, baseline values of glyphosate sensitivity were determined for each weed species. The GR50 baseline values ranged from 10.25 to 53.23 g ai ha−1 for the dicotyledonous weed species and from 16.05 to 66.34 g ai ha−1 for the monocotyledonous weed species. The ratio between the GR50 values of the least and most sensitive populations was used to determine the SI50 (sensitivity index at 50% growth reduction) for each weed species. The SI50 values showed a 1.4- to 3.3-fold difference in sensitivity for dicotyledonous weed species and 1.4- to 2.4-fold difference for monocotyledonous weed species. The sensitivity index was also calculated as the ratio between the GR50 values of the least sensitive population and the baseline GR50 value estimated for a range of susceptible populations (SI50b). SI50b values showed a 1.2- to 1.6-fold difference in sensitivity for dicotyledonous weed species and 1.1- to 1.2-fold difference for monocotyledonous weed species. The sensitivity data generated in this study provide a reference for determining time-dependent changes in glyphosate sensitivity in the commonly found weeds in the maize fields of Castilla y Léon.

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Variation inElymus repenssusceptibility to glyphosate

Cited by 2 publications

References 43 publications

A Review of Non-Chemical Management of Couch Grass (Elymus repens)

A Review of Non-Chemical Management of Couch Grass (Elymus repens)

Glyphosate sensitivity of selected weed species commonly found in maize fields

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