Document Type : Research Paper
Authors
1
MSc Graduate, Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2
Gorgan University of Agricultural Sciences and Natural Resources
3
Iranian Research Institute of Plant Protection
4
Professor, Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
5
PhD graduate Gorgan University of Agricultural Sciences and Natural Resources
6
Head of Plant Protection Department, Agricultural Jihad Organization of Golestan Province
7
Gorgan
8
PhD Student, Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
10.22034/ijws.2024.134293
Abstract
To investigate the efficacy of pre-emergence application of pyroxasulfone herbicide on some grass weeds in wheat, a series of experiments were conducted in 2021-2022 in greenhouse and field conditions. The results of the dose-response experiment showed that the pyroxasulfone herbicide rate to control 50% of resistant and susceptible biotypes of ryegrass, littleseed canarygrass, and winter wild oat dry weight was 24.0-28.1, 20.6-21.5, and 20.1-20.2 g a.i ha-1, respectively, with no significant difference between resistant and susceptible biotypes. Also, no phytotoxicity was observed in wheat. In the second experiment, which investigated the pre-emergence application of pyroxasulfone on a ryegrass-infested wheat field in Banafshtappeh village, Bandargaz, the pyroxasulfone herbicide had good efficacy. Dry weight of rigid ryegrass in pyroxasulfone treatment was 99.2 and 144.5 g m⁻² at 60 and 90 days after sowing, which was 4.5 and 7 times higher than the dry weight of the weed-infested control, respectively. Grains per spike, 1000-grain weight, grain and biological yields, harvest index, plant height, leaf area index, and dry weight of herbicide-treated wheat were, respectively, 33.1, 19.1, 58.6, 43.1, 10.4, 10.0, 54.1, and 43.6% higher than those of the ryegrass-infested control. Also, pyroxasulfone controlled ryegrass dry weight by 89-94% when used in some townships of Golestan province without showing toxicity to wheat. According to the results obtained in the present study, pyroxasulfone herbicide successfully controlled both herbicide-resistant and -susceptible ryegrass biotypes in Golestan province.
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