Monitoring of Wild Oat Resistance to ACCase-Inhibiting Herbicides in Wheat Fields Across Iran

Document Type : Research Article

Authors

1 Iranian Research Institute of Plant Protection

2 Assistant Professor, Iranian Research Iinstitute of Plant Protection

3 Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran

4 Departemant of Agronomy, Faculty of Agriculture,Tarbiat Modares University,Tehran,Iran.

10.22034/ijws.2024.134782

Abstract

This study was conducted between 2018 and 2021 in two main parts, including screening experiments aimed at monitoring the resistance status of wild oats (Avena spp.) to commonly used ACCase-inhibiting herbicides, and mapping the distribution of wild oat populations resistant to this group of herbicides in wheat fields across the country. In the whole-plant bioassay experiment, 224 wild oat populations collected from nine provinces were exposed to the recommended application rates (1 and 1.2 L ha-1) of clodinafop-propargyl (Topik® 8% EC) and pinoxaden (Axial® 5% EC). The results showed that among the wild oat populations collected from the studied provinces, Ardabil and Golestan had the highest resistance cases (100%), followed by Fars (97%), Khuzestan (91%), Kermanshah (68%), Tehran and Ilam (64%), and Alborz (33%). In contrast, no clodinafop-propargyl resistance was confirmed in wild oat populations collected from Isfahan province. Overall, 181 (81%) of the 224 tested populations exhibited resistance to clodinafop-propargyl. However, none of the populations in the studied provinces showed resistance to pinoxaden, although the development of resistance was observed in one population from Khuzestan. A distribution map of wild oat populations resistant to clodinafop-propargyl in various provinces was also created. Based on the results of this study, it can be concluded that the continuous and improper use of clodinafop-propargyl herbicide in recent decades has led to the spread of resistance to this herbicide in wild oat populations in wheat fields across various provinces of the country.

Keywords

Iranian Journal of Weed Science
Volume 20, Issue 2
June 2025
Pages 85-104

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History

  • Receive Date: 07 December 2025
  • Accept Date: 07 December 2025
  • First Publish Date: 07 December 2025
  • Publish Date: 21 December 2024

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