Weed Science (2014) 62, 468-473

Bianca A.B. Martins, Elena Sánchez-Olguín, Alejandro Perez-Jones, Andrew G. Hulting and Carol Mallory-Smith (2014)
Alleles contributing to ACCase-resistance in an Italian ryegrass (Lolium perenne ssp. multiflorum) population from Oregon
Weed Science 62 (3), 468-473
Abstract: Acetyl-coenzyme A carboxylase (ACCase)-resistant Italian ryegrass is one of the most difficult-to-control weeds in United States wheat-production systems. Seed was collected from a suspected ACCase-resistant Italian ryegrass population in a winter wheat field with a history of ACCase-inhibitor herbicide use. This study investigated cross-resistance patterns in this Italian ryegrass population. Resistance was identified to the commercial dose of the ACCase herbicides pinoxaden, clethodim, sethoxydim, and clodinafop. Partial chloroplastic ACCase sequences revealed aspartate-to-glycine or isoleucine-to-asparagine substitutions at positions 2078 or 2041 in individuals of the resistant population. This is the first report, to our knowledge, of Asp-2078-Gly and Ile-2041-Asn substitutions in ACCase-resistant Italian ryegrass in the United States. Associating the occurrence of resistance alleles with resistance to specific active ingredients provides a better understanding of ACCase cross-resistance in Italian ryegrass and possibly options for its control.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Assis Barbosa Bianca Martins, Andrew G. Hulting, Alejandro Perez-Jones

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Lolium perenne multiflorum (weed)	Wheat (Triticum)	U.S.A. (NW)