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Evaluation the efficacy of the new herbicide Fenyunifam (a Premix of Metsulfuron-methyl + Chlorimuron-ethyl, WP 10%) in controlling paddy field weeds was conducted in Gilan and Mazandaran Provinces during the 2023 growing season. This premix herbicide was designed to control all types of weeds (sedges, broadleaf and narrow-leaf) to provide comprehensive control over all weed groups. In Gilan Province, the experimental treatments included 0 (control), 50%, 100%, 150%, and 200% of the proposed registration dose of Fenyunifam (20 g commercial product per hectare), recommended doses of the herbicides Triafamone + Ethoxysulfuron, Bispyribac-sodium + Penoxsulam, Pyrazosulfuron, Thiobencarb, Pretilachlor + Londax. In Mazandaran Province, the treatments consisted of Pendimethalin, Bispyribac-sodium, Penoxsulam, Pretilachlor, Bensulfuron-methyl, Flucetosulfuron, Pyrazosulfuron-ethyl + Pretilachlor, Bensulfuron-methyl + Pretilachlor. Also doses of 500, 700, 900, 1100, 1300, and 1500 cc of Bispyribac-sodium + Penoxsulam was included. Additionally, a manual weeding control treatment was included. Assessments were conducted through visual observations and destructive sampling at three stages during the vegetative and reproductive growth periods. Overall, in neither visual evaluations nor destructive sampling (related to weed biomass and density) did the new herbicide Fenyunifam demonstrate acceptable performance. The conventional herbicides showed significantly higher efficacy in weed control and greater economic performance compared to Fenyunifam. Despite combining two active ingredients with complementary spectrums of action, Fenyunifam was significantly less effective than existing herbicides in field conditions, both in terms of weed control and crop performance. These findings underscore the need to reformulate the herbicide and optimize its application rate.
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