Weed Control in Corn and Soybean with Group 15 (VLCFA Inhibitor) Herbicides Applied Preemergence

Soltani, Nader; Brown, Lynette R.; Sikkema, Peter H.

doi:10.1155/2019/8159671

Cited by 10 publications

(17 citation statements)

References 19 publications

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“…Although residual herbicide efficacy and selectivity is driven by a variety of factors (Prata et al 2003), our results are in agreement with those reported in several other published studies on corn or alfalfa production. For example, Soltani et al (2019) found that when used with corn, S-metolachlor at 1.05 kg ha −1 provided excellent control (>90%) of redroot pigweed and green foxtail, intermediate control (65%) of common lambsquarters, and poor control (12%) of common ragweed. Likewise, metribuzin at 0.21, 0.31, or 0.42 kg ha −1 was reported to provide at least 80% control of Amaranthus spp.…”

Section: Weed Controlmentioning

confidence: 99%

PRE- and POST-applied herbicide options for alfalfa interseeded with corn silage

Osterholz¹,

Dias²,

Grabber

et al. 2020

Weed Technol

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Establishment of alfalfa by interseeding into corn planted for silage can enhance crop productivity but weed management is a challenge to adoption. Although a glyphosate-based herbicide program could be a simple and effective approach, concerns about herbicide resistance and limitations in available alfalfa varieties exist. Field experiments were conducted to compare the efficacy and selectivity of preemergence (PRE), postemergence (POST) and PRE followed by POST herbicide programs to a glyphosate only strategy when interseeding alfalfa into corn. Experiment 1 compared PRE applications of acetochlor, mesotrione, S-metalochlor, metribuzin, and flumetsulam, and found both rates of acetochlor and metribuzin, and S-metalochlor at 1.1 kg ha-1 were the most effective and selective PRE herbicides 4 weeks after treatment (WAT), but each resulted in greater overall weed cover than glyphosate by 8 WAT. Experiment 2 evaluated POST applications at early and late timings of bentazon, bromoxynil, 2,4-DB, and mesotrione. Several POST herbicides exhibited similar effectiveness and selectivity as glyphosate including early applications of bromoxynil (0.14 kg ha-1) and 2,4-DB (0.84 or 1.68 kg ha-1), as well as late applications of bromoxynil (0.42 kg ha-1), 2,4-DB (0.84 kg ha-1) and mesotrione (0.05 or 0.11 kg ha-1). A third experiment compared applications of acetochlor PRE, bromoxynil POST, and the combination of acetochlor PRE with bromoxynil POST. All treatments were effective and safe for use in this interseeded system, although interseeded alfalfa provided 65-70% weed suppression in corn planted for silage without any herbicide. Herbicide treatments had no observable impacts on corn and alfalfa yields so weed management was likely of limited economic importance. However, weed competitiveness can vary based on several different factors including weed species, density, and site-specific factors, and so further investigations under different environments and conditions are needed.

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Section: Weed Controlmentioning

confidence: 99%

PRE- and POST-applied herbicide options for alfalfa interseeded with corn silage

Osterholz¹,

Dias²,

Grabber

et al. 2020

Weed Technol

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“…The mixture of tolpyralate þ atrazine with acetochlor, dimethenamid-p, flufenacet, pendimethalin, pyroxasulfone, or S-metolachlor reduced barnyardgrass density 75% to 92% and shoot dry biomass 97% to 99%; there was no variation between the grass herbicides tested (Table 6). In other studies, Fluttert et al (2022) Foxtail Species (Giant and Green Foxtails) Tolpyralate þ atrazine in a mixture or in combination with acetochlor, dimethenamid-p, flufenacet, pendimethalin, pyroxasulfone, or S-metolachlor controlled foxtail species 80% to 99% at (Soltani et al 2019). Additionally, the density of green foxtail was reduced 99%, 95%, and 95%; and shoot biomass was reduced 99%, 93%, and 97% with dimethenamid-p, pyroxasulfone, and S-metolachlor, respectively (Soltani et al 2019).…”

Section: Barnyardgrassmentioning

confidence: 95%

Weed control in corn with tolpyralate and atrazine plus grass herbicides

Soltani,

Shropshire,

Sikkema

2023

Weed Technol

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Six field experiments were established in southwestern Ontario in 2021 and 2022 to evaluate if the addition of a grass herbicide (acetochlor, dimethenamid-p, flufenacet, pendimethalin, pyroxasulfone, or S-metolachlor) to tolpyralate + atrazine improves late-season weed control in corn. Tolpyralate + atrazine caused 12% and 5% corn injury at 1 and 4 weeks after herbicide application (WAA); corn injury was not increased with the addition of a grass herbicide. Weed inference reduced corn yield 60%. The addition of a grass herbicide to tolpyralate + atrazine did not enhance velvetleaf control. The addition of acetochlor or dimethenamid-p to tolpyralate + atrazine enhanced pigweed species control 4% 4 WAA; the addition of other grass herbicides tested did not increase pigweed species control. The addition of acetochlor enhanced common ragweed control 5% at 4 WAA and the addition of acetochlor or dimethenamid-p enhanced common ragweed control 8% at 8 WAA; the addition of other grass herbicides did not improve common ragweed control. The addition of acetochlor to tolpyralate + atrazine enhanced common lambsquarters control up to 4%; there was no enhancement in common lambsquarters control with the addition of the other grass herbicides. Tolpyralate + atrazine controlled barnyardgrass 90% and 78% at 4 and 8 WAA, respectively; the addition of a grass herbicide enhanced barnyardgrass control 9 to 10% and 21% at 4 and 8 WAA, respectively. Tolpyralate + atrazine controlled green or giant foxtail 80% and 69% at 4 and 8 WAA, respectively; the addition of a grass herbicide enhanced foxtail species control 15 to 19% and 24 to 29% at 4 and 8 WAA, respectively. This research shows that adding a grass herbicide to tolpyralate + atrazine mixture can improve weed control efficacy, especially increased annual grass control in corn production.

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“…When S-metolachlor was in a preformulated mixture with atrazine + mesotrione, mesotrione + bicyclopyrone, atrazine, or atrazine + mesotrione + bicyclopyrone control of green pigweed improved from 45 to 55 to 68 to 76% at 8 WAA. In a study by Soltani et al (2019), control of redroot pigweed at 8 WAA in corn with S-metolachlor, dimethenamid-p, and pyroxasulfone was 96, 99, and 99% at rates of 1050, 544, and 100 g a.i. ha -1 respectively.…”

Section: Efficacy Of Preemergence Herbicidesmentioning

confidence: 99%

“…Dimethenamid-p, flumetsulam, saflufenacil/dimethenamid-p, S-metolachlor/atrazine/mesotrione, S-metolachlor/mesotrione/bicyclopyrone, pyroxasulfone, dicamba/atrazine, mesotrione + atrazine, isoxaflutole + atrazine, atrazine, S-metolachlor/atrazine/mesotrione/bicyclopyrone, S-metolachlor/atrazine, and mesotrione + rimsulfuron reduced green pigweed biomass similarly 56 to 93% at 8 WAA (Table 4). Soltani et al (2019) reported that, S-metolachlor, dimethenamid-p, and pyroxasulfone at rates of 1050, 544, and 100 g a.i. ha -1 , respectively, reduced redroot pigweed density and biomass to the extent that they were similar to the weed-free control at 8 WAA.…”

Section: Efficacy Of Preemergence Herbicidesmentioning

confidence: 99%

Control of Multiple-Herbicide-Resistant Green Pigweed (Amaranthus powellii) With Preemergence and Postemergence Herbicides in Ontario Corn Production

Aicklen¹,

Soltani²,

Tardif³

et al. 2022

JAS

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Green pigweed [Amaranthus powellii S.Wats.] is a prolific annual dicot weed that is a prominent weed of crop production in northeastern North America. Green pigweed interference has been documented to reduce corn yields up to 54% in the absence of control strategies. In 2021, a green pigweed biotype from a field near Dresden, Ontario, Canada was determined to be resistant to MCPA, mecoprop, dichlorprop-p, aminocyclopyrachlor (synthetic auxins), and imazethapyr (acetolactate synthase-(ALS)-inhibitor), further impacting control of this weed biotype. Two field studies, with herbicides applied preemergence (PRE) or postemergence (POST), were conducted in 2020 and repeated in 2021. The objective of the research was to determine the most effective PRE and POST herbicides for the control of multiple-herbicide-resistant (MHR) green pigweed in Ontario corn production. 18 PRE and 18 POST herbicide treatments were evaluated in separate studies. Visible crop injury, visible green pigweed control at specified timepoints after herbicide application, green pigweed density, green pigweed biomass, and corn yield at harvest maturity were collected. In the PRE study, rimsulfuron + mesotrione was identified as the most efficacious treatment providing 88% control at 8 WAA. In the POST study, atrazine was identified as the most efficacious treatment providing 94% control at 8 WAA. Control with all PRE herbicide treatments was impacted by rainfall following application. MCPA ester applied POST controlled green pigweed 30% at 8 WAA; reduced control is attributed to herbicide resistance in this biotype. When compared to similar studies, control of green pigweed was reduced with some of the POST herbicides tested. While MHR green pigweed represents an additional challenge for growers, there are efficacious herbicide treatments that would allow it to be managed in corn production.

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Weed Control in Corn and Soybean with Group 15 (VLCFA Inhibitor) Herbicides Applied Preemergence

Cited by 10 publications

References 19 publications

PRE- and POST-applied herbicide options for alfalfa interseeded with corn silage

PRE- and POST-applied herbicide options for alfalfa interseeded with corn silage

Weed control in corn with tolpyralate and atrazine plus grass herbicides

Control of Multiple-Herbicide-Resistant Green Pigweed (Amaranthus powellii) With Preemergence and Postemergence Herbicides in Ontario Corn Production

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