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
Professor, Department of Weed Research, Iranian Research Institute of Plant Protection
4
Professor, Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
5
PhD graduate, Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
6
Head of Plant Protection Department, Agricultural Jihad Organization of Golestan Province
7
PhD Graduate, Department of Agronomy, Ferdowsi University of Mashhad, Mashhad, Iran Head of Iranian Invasive Plants Working Group
8
PhD Student, Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Abstract
To investigate the efficacy of pre-emergence application of pyroxasulfone herbicide on some monocot weeds in wheat, a series of experiments were conducted in 2021-2022 in greenhouse and field. The results of 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. 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 a good efficacy. Dry weight of rigid ryegrass 60 and 90 days after sowing was 99.2 and 144.5 g m-2, which was 4.5 and 7 times more than that of the weed-infested control. Grains per spike, 1000 grain weight, grain and biological yields, harvest index, plant height, leaf area I ndex and dry weight of herbicide-treated wheats was 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 for wheat. According to the results obtained in the present study, the pyroxasulfone herbicide successfully controlled both herbicide-resistant and –susceptible ryegrass biotypes in Golestan province.
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