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Effectiveness of 2,4-D/dicamba/dichlorprop-p premixture for controlling glyphosate-resistant kochia ( Bassia scoparia L.) in the Central Great Plains

Year: 2026
Type: article
Abstract: Widespread evolution of glyphosate resistance among kochia populations is a serious challenge for growers across the North American Great Plains. Dicamba has historically been used to control glyphosate-resistant (Gly-R) kochia. However, the increasing spread of dicamba-resistant kochia and current restrictions on the use of low-volatile formulations of dicamba warrant alternative herbicide options to control Gly-R kochia. In this context, field-based dose-response experiments were conducted in fallow in Hays, Kansas, during 2021 and 2022 to determine and compare the effectiveness of 2,4-D, dicamba, and dichlorprop-p applied alone, and in a premixture of 2,4-D/dicamba/dichlorprop-p for controlling Gly-R kochia. Averaged across 2 yr, results indicated that substantially lower doses of 2,4-D, dicamba, and dichlorprop-p were required in a premixture to achieve effective control of Gly-R kochia compared with their stand-alone applications. Specifically, the ED₉₀ values for Gly-R kochia control were reduced by 90, 4, and 6 times for 2,4-D, dicamba, and dichlorprop-p, respectively, when applied as a premixture. Similarly, achieving 90% biomass reduction required approximately 1,021, 3, and 4 times lower doses of 2,4-D, dicamba, and dichlorprop-p, respectively, in the premixture than when applied alone. Altogether, these results demonstrated that the premixture of 2,4-D/dicamba/dichlorprop-p can be an effective alternative for managing Gly-R kochia in fallow. The reduced dose requirements in a premixture also suggest potential benefits for resistance management, cost efficiency, and environmental stewardship.
DOI: 10.1017/wet.2026.10098
Language: English
Subfield: Plant Science
Open Access status: gold
Estimated APC paid: $3,550
OpenAlex ID: W7153787871
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