TY - JOUR
T1 - Conyza bonariensis (flax-leaf fleabane) resistant to both glyphosate and ALS inhibiting herbicides innorth-eastern Victoria
AU - Aves, Charlotte
AU - Broster, John
AU - Weston, Leslie
AU - Gill, Gurjeet S.
AU - Preston, Christopher
N1 - Funding Information:
This research was supported by the Grains Research and Development Corporation (GRDC) grant UCS00020. The University of Adelaide provided a postgraduate scholarship to CA.
Publisher Copyright:
© 2020 CSIRO.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/3
Y1 - 2020/10/3
N2 - Conyza bonariensis (L.) Cronq. (syn. of Erigeron bonariensis L.) is a difficult-to-control summer weed species in the cropping belt of south-eastern Australia. Herbicide resistance may be affecting the ability to control C. bonariensis in the agricultural region of north-eastern Victoria; therefore, a survey was conducted to evaluate resistance to herbicides from several mode-of-action groups. Of the populations collected, 40% were resistant to glyphosate at 1080 g ha-1. Chlorsulfuron failed to control any of the populations collected. Further research identified multiple herbicide resistance to glyphosate, chlorsulfuron, metsulfuron-methyl and sulfometuron-methyl in five of nine populations fully characterised. Resistance was not found to 2,4-D, clopyralid or paraquat. There was no correlation between prevailing land use and the frequency of glyphosate-resistant populations, suggesting that resistance had been selected in multiple production systems. The high frequency of resistance could explain the difficulty experienced in controlling C. bonariensis across north-eastern Victoria and demonstrates the importance of integrated weed management to manage this weed.
AB - Conyza bonariensis (L.) Cronq. (syn. of Erigeron bonariensis L.) is a difficult-to-control summer weed species in the cropping belt of south-eastern Australia. Herbicide resistance may be affecting the ability to control C. bonariensis in the agricultural region of north-eastern Victoria; therefore, a survey was conducted to evaluate resistance to herbicides from several mode-of-action groups. Of the populations collected, 40% were resistant to glyphosate at 1080 g ha-1. Chlorsulfuron failed to control any of the populations collected. Further research identified multiple herbicide resistance to glyphosate, chlorsulfuron, metsulfuron-methyl and sulfometuron-methyl in five of nine populations fully characterised. Resistance was not found to 2,4-D, clopyralid or paraquat. There was no correlation between prevailing land use and the frequency of glyphosate-resistant populations, suggesting that resistance had been selected in multiple production systems. The high frequency of resistance could explain the difficulty experienced in controlling C. bonariensis across north-eastern Victoria and demonstrates the importance of integrated weed management to manage this weed.
KW - acetolactate synthase
KW - PSI inhibitors
KW - synthetic auxins
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U2 - 10.1071/CP19537
DO - 10.1071/CP19537
M3 - Article
AN - SCOPUS:85092766381
VL - 71
SP - 864
EP - 871
JO - Crop and Pasture Science
JF - Crop and Pasture Science
SN - 0004-9409
IS - 9
ER -