Identification of Phalaris brachystachys Link. resistance to haloxyfop-R-methyl herbicide from fields of Golestan province

Subject Areas : Weed Research Journal

Sajedeh Golmohammadzadeh, ¹ , Javid Gherekhloo ² , Antonia Rojano-Delgado ³ , Maria Osuna ⁴ , Behnam Kamkar ⁵ , Farshid Ghaderi-Far ⁶ , Rafael de Prado ⁷

1 - Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Iran
2 - Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Iran
3 - Researcher, Department of Agricultural Chemistry and Soil Science, University of Córdoba, Spain
4 - Researcher, Center for Scientific and Technological Research of Extremadura (CICYTEX), Badajoz, Spain
5 - Academic Staff, Gorgan University of Agricultural Sciences and Natural Resources
6 - َAgronomy department, Gorgan University of Agricultural Sciences and Natural Resources
7 - Professor and Researcher, Department of Agricultural Chemistry and Soil Science, University of Córdoba, Spain

Received: 2019-07-23 Accepted : 2020-02-06 Published : 2019-08-23

Keywords: Discrimination concentration, Distribution map, Dose-response, seed bioassay,

Abstract :

In order to investigate the resistance of Phalaris brachystachys Link. to haloxyfop-R-methyl herbicide, a test was conducted at Gorgan University of Agricultural Sciences and Natural Resources in 2017. Experimental treatments included 36 biotypes of P. brachystachys suspected resistance and one susceptible biotype which were collected from wheat fields in Golestan province. The experiments included determination of discriminating concentration, screening all biotypes with discriminating concentration, concentration-response and dose-response tests for resistant biotypes. In the seed bioassay, after determining the discriminating concentration and screening all biotypes, a range of herbicide concentrations were applied. In the dose-response test, the response of P. brachystachys biotypes in a range of doses from 0.25 to 8 times the recommended dose herbicide was investigated. The resistance factor obtained of whole plant assay was 2 to 4. Also, there was a high correlation between resistance factor obtained from whole plant and seed bioassay methods (87%). Checking the distribution map of resistant biotypes indicated that these biotypes were not uniform in the wheat fields of Golestan province.