Mechanisms of glyphosate resistance and response to alternative herbicide-based management in populations of the three Conyza species introduced in southern Spain

Pest Management Science
Ignacio Amaro-BlancoRafael De Prado

Abstract

In perennial crops, the most common method of weed control is to spray herbicides, and glyphosate has long been the first choice of farmers. Three species of the genus Conyza are among the most problematic weeds for farmers, exhibiting resistance to glyphosate. The objectives of this study were to evaluate resistance levels and mechanisms, and to test chemical control alternatives in putative resistant (R) populations of Conyza bonariensis, Conyza canadensis and Conyza sumatrensis. Plants from the three R populations of Conyza spp. survived high doses of glyphosate compared with plants from susceptible (S) populations. The rate of movement of 14 C glyphosate out of treated leaves in plants from S populations was higher than in plants from R populations. Only plants from the R population of C. sumatrensis contained the known target site 5-enolpyruvylshikimate-3-phosphate synthase mutation Pro106-Thr. Field responses to the different alternative herbicide treatments tested indicated injury and high effectiveness in most cases. The results indicate that non-target site resistant (NTSR) mechanisms explain resistance in C. bonariensis and C. canadensis, whereas both NTSR and target site resistant (TSR) mechanisms contribute to resis...Continue Reading

References

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Aug 30, 2016·Frontiers in Plant Science·Pablo T Fernández-MorenoRafael De Prado
Feb 6, 2017·Pest Management Science·Hugh J Beckie, K Neil Harker
Apr 7, 2017·Plant Physiology and Biochemistry : PPB·Jose Alfredo Dominguez-ValenzuelaRafael De Prado

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Citations

May 18, 2019·International Journal of Molecular Sciences·Maria J GarcíaRafael De Prado
Jul 23, 2019·Journal of Plant Physiology·Candelario Palma-BautistaRafael De Prado
Mar 9, 2021·Frontiers in Plant Science·José G Vázquez-GarcíaRafael De Prado
Dec 3, 2021·Journal of Agricultural and Food Chemistry·Candelario Palma-BautistaRafael De Prado

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