Document Type : Research Article
Authors
1
Assistant Professor of Plant Protection Research Department, Fars Agricultural and Natural Resources Research and Education Center, AREEO,, Darab, Iran
2
Research Associate, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran,
3
Researcher of Agricultural and Natural Resources Research and Education Center of Khuzestan, Agricultural Research, Education and Extension Organization (AREEO), Ahvaz, Iran
4
Assistant Professor of Plant Protection Research Department, Semnan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Shahrood, Iran,
5
Professor, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
6
Research Instructor of, Plant Protection Research Department, Agricultural and Natural Resources Research and Education Center of Fars, Agricultural Research, Education and Extension Organization (AREEO), Darab, Iran,
10.22034/ijws.2026.371153.1504
Abstract
Narrow-leaved weeds are among the most important limiting factors for wheat production in Iran. To evaluate the efficacy of the new herbicide Rythmica in controlling grass weeds in wheat fields, a randomized complete block design (RCBD) experiment with 13 treatments and four replications was conducted at four locations (Fars, Ahvaz, Karaj, and Shahrood) during 2023–2024. The treatments included the application of clodinafop-propargyl (Topic) at 1 L ha⁻¹; fenoxaprop-P-ethyl (Puma Super) at 1 L ha⁻¹; mesosulfuron-methyl (Mesomax) at 1.25 L ha⁻¹; mesosulfuron-methyl + mefenpyr-diethyl (Rythmica) at 300, 400, and 500 mL ha⁻¹; iodosulfuron-methyl-sodium + mesosulfuron-methyl + mefenpyr-diethyl (Atlantis) at 1.5 L ha⁻¹; iodosulfuron-methyl-sodium + mesosulfuron-methyl + diflufenican + mefenpyr-diethyl (Othello) at 1.6 L ha⁻¹; pinoxaden (Axial) at 1.25 L ha⁻¹; and a hand-weeded control. The results showed that Rithmica herbicide (500 mL ha⁻¹) had a very high efficacy in controlling wild oat (Avena ludoviciana) and canarygrass (Phalaris minor). Accordingly, application of Rithmica (500 mL ha⁻¹) reduced the dry weight of A. ludoviciana and P. minor by 90 to 100% across different locations. However, the efficacy of this herbicide in controlling rigid ryegrass (Lolium rigidum) in Darab and Ahvaz was unsatisfactory (40–60%). Moreover, application of Rithmica (500 mL ha⁻¹) significantly increased wheat grain yield, by 3-to-6-ton ha⁻¹ across different locations. Based on the experimental results, Rithmica herbicide (400–500 mL ha⁻¹) is a suitable option for controlling narrow-leaved weeds of A. ludoviciana and P. minor in wheat fields of Iran.
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