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Control of thiocarbamate-resistant rigid ryegrass (Lolium rigidum) in wheat in southern Australia

Published online by Cambridge University Press:  10 September 2019

David J. Brunton Open the ORCID record for David J. Brunton [Opens in a new window] ,
Peter Boutsalis ,
Gurjeet Gill  and
Christopher Preston
David J. Brunton*
Affiliation:
Postgraduate Student, School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, South Australia
Peter Boutsalis
Affiliation:
Postdoctoral Fellow, School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, South Australia
Gurjeet Gill
Affiliation:
Associate Professor, School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, South Australia
Christopher Preston
Affiliation:
Professor, School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, South Australia
*
Author for correspondence: David Brunton, School of Agriculture, Food and Wine, University of Adelaide, PMB 1, Glen Osmond, South Australia, 5064. Email: david.brunton@adelaide.edu.au
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Abstract

Two field experiments were conducted during 2018 at Paskeville and Arthurton, South Australia, to identify effective herbicide options for the control of thiocarbamate-resistant rigid ryegrass in wheat. Dose–response experiments confirmed resistance in both field populations (T1 and A18) of rigid ryegrass to triallate, prosulfocarb, trifluralin, and pyroxasulfone. T1 and A18 were 17.9- and 20-fold more resistant to triallate than susceptible SLR4. The level of resistance detected in T1 to prosulfocarb (5.9-fold) and pyroxasulfone (4-fold) was lower compared to A18, which displayed 12.1- and 7.8-fold resistance to both herbicides, respectively. Despite resistance, the mixture of two different preplant-incorporated (PPI) site-of-action herbicides improved rigid ryegrass control and wheat yield compared to a single PPI herbicide only. Prosulfocarb + triallate and prosulfocarb + S-metolachlor + triallate did not reduce rigid ryegrass seed set when compared to prosulfocarb applied alone at the higher rate (2,400 g ai ha–1). Pyroxasulfone + triallate PPI followed by glyphosate (1,880 g ai ha-1) as a weed seed set control treatment reduced rigid ryegrass seed production by 93% and 95% at both sites, respectively. These herbicides also significantly improved grain yield of wheat at Paskeville (22%) and Arthurton (38%) compared to the untreated.

Keywords

David Johnson, Corteva AgriscienceProsulfocarbtriallatepyroxasulfoneS-metolachlortrifluralinglyphosaterigid ryegrass, Lolium rigidum Gaudin LOLRIwheatTriticum aestivum L. ‘Chief CL Plus’Thiocarbamatesherbicide resistancepreplant incorporatedweed seed set controlweed control
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 1 , February 2020 , pp. 19 - 24
Copyright
© Weed Science Society of America, 2019 

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