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|Title:||Resistance to very-long-chain fatty-acid (VLCFA)- inhibiting herbicides in multiple field-selected rigid ryegrass( Lolium rigidum) populations|
|Citation:||Weed Science, 2019; 67(3):267-272|
|Publisher:||Cambridge University Press (CUP)|
|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.|
|Appears in Collections:||Agriculture, Food and Wine publications|
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