Conyza bonariensis (flax-leaf fleabane) resistant to both glyphosate and ALS inhibiting herbicides innorth-eastern Victoria
Charlotte Aves A , John Broster
B , Leslie Weston B , Gurjeet S. Gill A and Christopher Preston A C
+ Author Affiliations
- Author Affiliations
A School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA 5064, Australia.
B School of Agriculture and Wine Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia.
C Corresponding author. Email: christopher.preston@adelaide.edu.au
Crop and Pasture Science 71(9) 864-871 https://doi.org/10.1071/CP19537
Submitted: 20 December 2019 Accepted: 15 August 2020 Published: 3 October 2020
Abstract
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.
Keywords: acetolactate synthase, PSI inhibitors, synthetic auxins.
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