Pest Management Science (2000) 56, 1054-1058

Eleni Kotoula-Syka, Avi Tal and Baruch Rubin (2000)
Diclofop-resistant Lolium rigidum from northern Greece with cross-resistance to ACCase inhibitors and multiple resistance to chlorsulfuron
Pest Management Science 56 (12), 1054-1058
Abstract: Repeated use of ACCase- and ALS-inhibiting herbicides in northern Greece has resulted in the evolution of a population of Lolium rigidum resistant to diclofop and chlorsulfuron. The biotype from Athos was highly resistant to diclofop and also exhibited differential cross-resistance to clodinafop, fluazifop, tralkoxydim and sethoxydim. Assay of ACCase activity confirmed that the resistant biotype was tenfold more resistant to diclofop than the susceptible biotype, suggesting that the resistance mechanism could involve an altered target site. The diclofop-resistant biotype has also exhibited multiple resistance to chlorsulfuron and the mechanism for this is unknown. Seed-bioassay was found to be a rapid, cheap and reliable method to identify populations of L rigidum resistant to ACCase inhibitors and chlorsulfuron. Moreover, root elongation in the seed bioassay was more sensitive to ACCase inhibitors and chlorsulfuron than shoot elongation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Baruch Rubin, Avi Tal

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 rigidum (weed)		Greece