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Type: Journal article
Title: Resistance to very-long-chain fatty-acid (VLCFA)- inhibiting herbicides in multiple field-selected rigid ryegrass( Lolium rigidum) populations
Author: Brunton, D.J.
Boutsalis, P.
Gill, G.
Preston, C.
Citation: Weed Science, 2019; 67(3):267-272
Publisher: Cambridge University Press (CUP)
Issue Date: 2019
ISSN: 0043-1745
Statement of
David J. Brunton, Peter Boutsalis, Gurjeet Gill and Christopher Preston
Abstract: Five populations of rigid ryegrass (LoliumrigidumGaudin) fromfields across cropping regions in southern Australia were suspected of having resistance to thiocarbamates, chloroacetamides, and sulfonylisoxazoline herbicides. Resistant (R) populations 375-14, 198-15, 16.2, EP162, RAC1, and A18 and two susceptible (S) populations (SLR4 and VLR1) were included in a dose–response study. All suspected R populations expressed resistance to one or all herbicides (thiocarbamates, chloroacetamides, and pyroxasulfone). Population 198-15 exhibited the highest LD50 to triallate (44.7-fold), prosulfocarb (45.7-fold), S-metolachlor (31.5-fold), and metazachlor (27.2-fold) compared with the S populations. Populations 198-15 and 375-14 were also resistant to pyroxasulfone (13.5- and 14.9-fold) compared with the S populations, as was population EP162. This study documents the first case of field-evolved resistance to thiocarbamate, chloroacetamide, and sulfonylisoxazoline herbicides in L. rigidum.
Keywords: Chloroacetamides; cross-resistance; herbicide resistance; multiple resistance; PRE herbicides; sulfonylisoxazoline; thiocarbamates
Rights: © Weed Science Society of America, 2019.
RMID: 0030117442
DOI: 10.1017/wsc.2018.93
Appears in Collections:Agriculture, Food and Wine publications

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