Target-site resistance to trifluralin is more prevalent in annual ryegrass populations from Western Australia.
Pest Manag Sci
; 78(3): 1206-1212, 2022 Mar.
Article
em En
| MEDLINE
| ID: mdl-34837476
ABSTRACT
BACKGROUND:
Trifluralin is widely used in Australia as one of the important pre-emergence herbicides to control annual ryegrass (Lolium rigidum Gaud.) populations. Trifluralin resistance evolution and mechanisms have been identified in some ryegrass populations.RESULTS:
In this study, 21 putative resistant field survey populations from Western Australian were screened with trifluralin, and 90% (19 of 21) contained individuals surviving 480 g ha-1 trifluralin treatment. Twelve populations contained individuals possessing the known α-tubulin resistance mutations at Val-202, Thr-239 and Arg-243 in TUA4 (alpha-tubulin 4 n), plus multiple potential resistance mutations in TUA4 pending genetic confirmation. Three populations had only individuals carrying newly identified (but uncharacterized) mutations in TUA3/TUA4. Radioactive work found that six populations evolved metabolic resistance to trifluralin, and at least four of them also possessed the known and/or putative target-site mutations.CONCLUSION:
These results confirm that a high incidence of resistance to the dinitroaniline herbicide (trifluralin) is present, and target-site tubulin mutations make a major contribution to resistance in these annual ryegrass populations. Co-evolution of both target-site and non-target-site resistance to per-emergence herbicides warrants diverse management tactics.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Lolium
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Herbicidas
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article