Weed Control J 2026; 25: e202600889
Selectivity and efficacy of herbicides als enzyme inhibitors applied in wheat with clearfield® technology
DOI: 10.7824/wcj.2026;25:00889
Abstract:
Background:
Chemical weed control in wheat using herbicides offers greater efficacy and practicality, as well as lower costs compared to other control methods. However, these products can cause direct and indirect impacts on crop growth and development depending on their selectivity.
Objective:
To evaluate the selectivity and efficacy of acetolactate synthase (ALS) inhibiting herbicides applied to the TBio Ello wheat cultivar with Clearfield® technology.
Methods:
The experiment was conducted in field conditions, in a randomized block design, with four replications. Treatments consisted of two controls (one weed-free and one weedy), and the herbicides: imazapic+imazapyr, imazethapyr+imazapic, imazethapyr, cloransulammethyl, nicosulfuron, imazamox, ethoxysulfuron, bispyribac-Na, and penoxsulam. Crop phytotoxicity and weed control assessments were performed at 7, 14, 21, 28, and 35 days after treatment application (DAT). Physiological parameters were evaluated at 21 DAT. At harvest, grain yield components were determined.
Results:
Nicosulfuron caused the highest phytotoxicity to wheat, and consequently, the lowest grain yield. The weed-free control, and the herbicided cloransulam-methyl, and bispyribac-Na showed the best physiological performance. Imazethapyr+imazapic, imazethapyr, cloransulam-methyl, ethoxysulfuron, and penoxsulam exhibited the lowest phytotoxicity to wheat at 35 DAT. The herbicides did not show adequate efficacy against ryegrass but achieved high levels of wild radish control, reaching 100% at 35 DAT.
Conclusions:
The highest wheat grain yield was observed in the weed-free control, while among the herbicide treatments, imazethapyr+imazapic was the most effective.
4