Herbicide mixtures: interactions and modeling

Barbieri, Geovana Facco; Young, Bryan G.; Dayan, Franck E.; Streibig, J. C.; Takano, Hudson Kagueyama; Merotto, Aldo; Avila, Luis Antônio de

doi:10.51694/advweedsci/2022;40:seventy-five011

Cited by 7 publications

(2 citation statements)

References 154 publications

(178 reference statements)

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“…The relatively high level of giant ragweed control observed in 2021 for the PRE herbicide premixes (S-metolachlor + bicyclopyrone + mesotrione, atrazine + S-metolachlor + bicyclopyrone + mesotrione, and clopyralid + acetochlor + mesotrione) compared with acetochlor or S-metolachlor, which have a single active ingredient, may be a result of the different SOA combinations in these mixtures. These different SOAs can complement each other under a range of environmental conditions, thus providing more consistent weed control (Barbieri et al 2022; Bollman et al 2006). Striegel et al (2021a) reported high (95%) giant ragweed control at this experimental location (Rock County Farm, Janesville, Wisconsin) using herbicide premixes that contain mesotrione (clopyralid + acetochlor + mesotrione and S-metolachlor + bicyclopyrone + mesotrione).…”

Section: Resultsmentioning

confidence: 99%

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

et al. 2023

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Widespread occurrence of herbicide-resistant weeds and more variable weather conditions across the US has made weed control in many crops more challenging. Preemergence (PRE) herbicides with soil residual activity have resurged as the foundation for early-season weed control in many crops. Field experiments were conducted at Janesville and Lancaster, WI in 2021 and 2022 (4 site-years) to evaluate the weed control efficacy of solo (single site of action [SOA]) and premix (two or more SOAs) PRE herbicides in conventional tillage corn. Treatments consisted of 18 PRE herbicides plus a non-treated check. At Janesville-2021, S-metolachlor + bicyclopyrone + mesotrione, atrazine + S-metolachlor + bicyclopyrone + mesotrione, and clopyralid + acetochlor + mesotrione provided >72% giant ragweed control. At Janesville-2022, none of the PRE herbicides evaluated provided >70% giant ragweed control due to the high giant ragweed density and the lack of timely rainfall. At Lancaster-2021, atrazine, dicamba, and flumetsulam + clopyralid provided <45% waterhemp control, but the remaining treatments provided >90% control. At Lancaster-2022, the efficacy of some PRE herbicides was reduced due to the high waterhemp density; however, most herbicides provided >75% control. At Lancaster-2021 and 2022, only dicamba and S-metolachlor did not provide >75% common lambsquarters control. PRE herbicides containing SOA group 15 provided >75% control of giant foxtail. Across weed species, PRE herbicides with two (78%) and three (81%) SOAs provided higher weed control than PRE herbicides with a single SOA (68%), indicating that at least two SOAs PRE result in better early-season weed control. The efficacy of the PRE herbicide treatments evaluated herein varied according to the soil seed bank weed community composition and environmental conditions (i.e., rainfall following application), but the premixes were a more reliable option to improve early-season weed control in conventional tillage corn.

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Section: Resultsmentioning

confidence: 99%

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

et al. 2023

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“…Applying two or more herbicide SOAs as a mixture is generally recommended to mitigate/delay herbicide resistance in weeds (Beckie and Reboud 2009; Green 1991). However, mixed applications of auxinic herbicides with other SOAs could be antagonistic or synergistic (Barbieri et al 2022). Previous studies indicated a synergistic interaction with mixtures of auxinic herbicides to control herbicide-resistant weeds.…”

Section: Introductionmentioning

confidence: 99%

Synergistic interactions of 2,4-D, dichlorprop-p, dicamba, and halauxifen/fluroxypyr for controlling multiple herbicide-resistant kochia (Bassia scoparia L.)

et al. 2023

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Multiple herbicide-resistant (MHR) kochia is a serious concern in the U.S. Great Plains and warrants alternative herbicide mixtures for its control. Greenhouse and field experiments were conducted at Kansas State University Research and Extension Centers near Hays and Garden City, KS to investigate the interactions of 2,4-D, dichlorprop-p, dicamba, and halauxifen/fluroxypyr premix in various combinations for MHR kochia control. Two previously confirmed MHR (resistant to glyphosate, dicamba, and fluroxypyr) populations and a susceptible (SUS) population were tested in a greenhouse study. Kochia at the Hays field site was resistant to glyphosate and chlorsulfuron, whereas the population at Garden City was resistant to glyphosate, dicamba, fluroxypyr, and atrazine. Results from greenhouse study indicated that 2,4-D, dicamba, dichlorprop-p, and premix of halauxifen/fluroxypyr provided 26 to 69% control of both MHR populations at 28 days after treatment (DAT). However, the control increased to 85 to 97% when these herbicides were applied in three-way mixtures. Synergistic interactions were observed when dicamba was mixed with dichlorprop-p, 2,4-D, dichlorprop-p + 2,4-D, and halauxifen/fluroxypyr + 2,4-D for shoot dry weight reductions (86 to 92%) of both MHR populations. Results from field study also indicated synergistic interactions when dicamba was mixed with dichlorprop-p + 2,4-D, halauxifen/fluroxypyr + dichlorprop-p, and halauxifen/ fluroxypyr + 2,4-D, resulting in 84 to 95% control of MHR kochia at 28 DAT across both sites. These results indicate that synergistic effects of mixing dicamba with other auxinic herbicides in two- or three-way mixtures can help control MHR kochia.

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The nexus between reactive oxygen species and the mechanism of action of herbicides

Traxler,

Gaines,

Küpper

et al. 2023

Journal of Biological Chemistry

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Herbicide mixtures: interactions and modeling

Cited by 7 publications

References 154 publications

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

Synergistic interactions of 2,4-D, dichlorprop-p, dicamba, and halauxifen/fluroxypyr for controlling multiple herbicide-resistant kochia (Bassia scoparia L.)

The nexus between reactive oxygen species and the mechanism of action of herbicides

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