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Accepted manuscript

Baseline sensitivity of Echinochloa glabrescens to florpyrauxifen-benzyl on a regional scale: A case study of Jiangsu Province, China

Published online by Cambridge University Press:  03 March 2025

Chen Guo-qi*
Affiliation:
Associate Professor, Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College (Research Institute of Rice Industrial Engineering Technology) of Yangzhou University, and Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, 225009, Yangzhou, China.
Chen Yang
Affiliation:
Graduate students, Agricultural College, Yangzhou University, 225009, Yangzhou, China.
Aatiqa Masoom
Affiliation:
Graduate students, Agricultural College, Yangzhou University, 225009, Yangzhou, China.
Wu Jia-jun
Affiliation:
Manager, Corteva Agriscience, 201203, Shanghai, China
Wei Hai-yan
Affiliation:
Professor, Agricultural College of Yangzhou University, 225009, Yangzhou, China.
*
*Author for correspondence: chenguoqi@yzu.edu.cn
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Abstract

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Systematically monitoring the baseline sensitivity of troublesome weeds to herbicides is crucial for the early detection of a premature market lifespan of herbicides. Florpyrauxifen-benzyl is one of the most important rice herbicides across the world, which has been used for five years in China. Barnyardgrass is one of the main targeted weed species of florpyrauxifen-benzyl. Totally 114 barnyardgrass populations were collected from rice fields in Jiangsu Province, China, and screened for susceptibility of each population to florpyrauxifen-benzyl by whole-plant bioassays. For all populations, the GR50 doses (the dose causing a 50% reduction in fresh weight of aboveground parts) of florpyrauxifen-benzyl ranged from 1.0 to 34.5 g ai ha-1, with an average of 6.8 g ai ha-1, a baseline sensitivity dose of 3.3 g ai ha-1, and a baseline sensitivity index of 34.5. Twenty-one days after treatment with florpyrauxifen-benzyl at the labeled dose (36 g ai ha-1), 90% of the barnyardgrass populations showed reductions in fresh weight of aboveground parts > 95%. Compared with the baseline sensitivity dose, 63, 44, and seven populations had no resistance (55%), low resistance (39%), and moderate resistance (6%) to florpyrauxifen-benzyl, respectively. Furthermore, the GR50 distribution of barnyardgrass populations did not show a significant correlation with city, planting methods (direct-seeding or transplanting), and rice species (ssp. indica or ssp. japonica) at the seed-collection rice fields (P > 0.05). In conclusion, florpyrauxifen-benzyl remains effective for barnyardgrass control in rice fields despite serious resistance challenges.

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Weed Science Society of America

Footnotes

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These authors contributed equally to this study.