Sugarbeet tolerance when dimethenamid-P follows soil-applied ethofumesate and S-metolachlor

Peters, Thomas J.; Lueck, Andrew B.; Carlson, Aaron L.

doi:10.1017/wet.2019.23

Cited by 4 publications

(6 citation statements)

References 34 publications

(49 reference statements)

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“…Although sugarbeet stature was affected by ethofumesate rate, ethofumesate did not reduce root yield in field experiments. These results were consistent with observations from other researchers (Bollman and Sprague 2007; Peters et al 2019; Smith and Schweizer 1983). Smith and Schweizer (1983) reported sugarbeet overcame early season injury from PRE and POST herbicides and did not affect yield.…”

Section: Resultssupporting

confidence: 94%

Ethofumesate applied at greater than labeled rates postemergence to sugarbeet

Lystad

Peters

2023

Weed Technol

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Ethofumesate is a broad spectrum, soil-applied herbicide for control of broadleaf and grass weeds in sugarbeet. Ethofumesate is commonly applied preemergence at rates ranging from 1.25 to 4.2 kg ai ha−1, or applied postemergence, up to 0.38 kg ai ha−1. Generic Crop Science has developed a new Ethofumesate 4SC label that increased ethofumesate postemergence rates up to 4.48 kg ha−1 in sugarbeet with more than two true leaves per plant. Field and greenhouse experiments were conducted in 2018 and 2019 to evaluate sugarbeet tolerance and herbicide efficacy. Field tolerance experiments indicated sugarbeet stature from ethofumesate postemergence at 0.28, 0.56, and 1.12 kg ha−1 was the same as the non-treated control, but ethofumesate at 2.24 kg ha−1 reduced sugarbeet stature; however, did not affect yield components. Ethofumesate postemergence at 4.48 kg ha−1 reduced sugarbeet stature and affected sugarbeet yield components. Ethofumesate alone postemergence provided weed control of up to 85, 76, and 84% on common lambsquarters, redroot pigweed, and waterhemp, respectively, in field efficacy experiments. Mixing ethofumesate at 1.12 kg ha−1 with glyphosate does not provide a second effective herbicide for postemergence control of common lambsquarters and redroot pigweed, but does provide residual control of these weeds when at least one-half inch of penetrating rainfall occurs, following application. In greenhouse experiments, ethofumesate alone or ethofumesate plus glyphosate timed to common lambsquarters, redroot pigweed, or waterhemp less than 2.5-cm provided the best combination of burndown and soil residual control compared with 2.5- to 5-cm tall weeds. Ethofumesate postemergence at 1.12 kg ha−1 plus glyphosate provided the best combination of tolerance and efficacy, especially on waterhemp.

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Section: Resultssupporting

confidence: 94%

Ethofumesate applied at greater than labeled rates postemergence to sugarbeet

Lystad

Peters

2023

Weed Technol

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“…In contrast, sugarbeet density was greater in soils with OM > 3.5%, in field experiments or in greenhouse pots with Fargo silty clay (7.7% OM) or Bearden/Lindaas silt loam (4.7% OM) soils, because S-metolachlor was bound and not available in the soil solution (Pusino et al 1992;Shaner et al 2006). Other researchers have noted similar sugarbeet stand inconsistency following S-metolachlor application Dexter and Luecke 2004;Peters et al 2019). Previous research conducted by Peters et al (2019) reported sugarbeet density reduction occurred in some, but not all environments following S-metolachlor PRE at 1.60 kg ha -1 or S-metolachlor PRE at 0.80 kg ha -1 plus ethofumesate at 1.68 kg ai ha -1 alone or followed by POST applications of dimethenamid-P at 0.95 kg ha -1 .…”

Section: Rainfall Om Soil Series and S-metolachlor Ratementioning

confidence: 84%

“…Other researchers have noted similar sugarbeet stand inconsistency following S-metolachlor application Dexter and Luecke 2004;Peters et al 2019). Previous research conducted by Peters et al (2019) reported sugarbeet density reduction occurred in some, but not all environments following S-metolachlor PRE at 1.60 kg ha -1 or S-metolachlor PRE at 0.80 kg ha -1 plus ethofumesate at 1.68 kg ai ha -1 alone or followed by POST applications of dimethenamid-P at 0.95 kg ha -1 . Sugarbeet injury was greatest in environments with less than 3.5% OM (2.6% OM actual), when air temperature was cooler than in environments with no injury, and when cumulative rainfall to 14 d after seeding equaled or was greater than 40 mm (58 mm actual).…”

Section: Rainfall Om Soil Series and S-metolachlor Ratementioning

confidence: 84%

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Environment influences sugarbeet tolerance to S-metolachlor

2020

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Herbicides used in sugarbeet are commonly adapted from other row crops and may cause injury and yield loss often associated with environmental and edaphic factors. Glyphosate-resistant waterhemp in sugarbeet requires a PRE herbicide, such as S-metolachlor, for its control. The objectives of this research were to evaluate sugarbeet tolerance to PRE S-metolachlor, including air temperature and soil water content interactions with soil series in field and growth chamber experiments. Results from field experiments conducted in 12 environments in 2015, 2016, and 2017 indicated 2.16 or 4.32 kg ai ha−1S-metolachlor applied PRE reduced sugarbeet density and stature but did not reduce root yield, sucrose content, or recoverable sucrose compared with the untreated control in environments with soils with less than 3.5% organic matter (OM) and receiving greater than 40-mm cumulative rainfall within 14 d after planting. In the growth chamber, sugarbeet density and shoot fresh weight following S-metolachlor application was influenced by soil moisture content, air temperature, and soil series but not by S-metolachlor rate. Sugarbeet density and shoot fresh weight were reduced 15% and 106%, respectively, when S-metolachlor was applied to a Glyndon sandy loam (2.6% OM, 9.5% clay) at 100% field capacity (FC) and 14 C compared with S-metolachlor application to a Fargo silty clay (7.7% OM and 54% clay) at 100% FC and 21 C. It is concluded that field selection, rather than herbicide rate, is an important criterion for managing sugarbeet tolerance with S-metolachlor.

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“…S-metolachlor reduced strawberry yield at 0.21 kg ha -1 , but only in selected, tested strawberry varieties (Boyd and Reed 2016). S-metolachlor at 2.16 to 4.32 kg ha -1 negatively affected sugar beet stand and growth while not influencing yield (Peters et al 2019). Sugar beet tolerance to S-metolachlor is variety-dependent (Bollman and Sprague 2008) and is reduced in soils with low clay and organic matter content (Lueck et al 2020).…”

Section: Italian Ryegrass Controlmentioning

confidence: 92%

Hazelnut growth and weed control in response to selected preemergence herbicides

Pedroso

Moretti

2022

Weed Technol

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Hazelnut hectarage is expanding in Oregon. Weed competition in young orchards can severely reduce the growth and survival of plants. New orchards replace crops, including grass seed fields, which often are infested with herbicide-resistant weeds, including Italian ryegrass. This research evaluated hazelnut tolerance to pronamide, pyroxasulfone, and S-metolachlor. Three multi-year field experiments were conducted at newly-planted orchards in the Willamette Valley during 2019 and 2020. Treatments compared pyroxasulfone (0.24 kg ai ha-1), pronamide (2.08 kg ai ha-1), and S-metolachlor (1.39 kg ai ha-1) applied at the reference rate, two- and four-fold compared to weed-free check. Treatments were applied within two weeks after the winter transplant and reapplied the following year. Hazelnuts showed a high tolerance to all herbicides tested, with negligible injury noted (<3%). No changes in leaf chlorophyll were noted, averaging 242, 179, and 225 mg m-2 on each study site. Tree growth was similar among treatments as measured by trunk cross-sectional area, canopy volume, and internode length. A separate study evaluated the control of Italian ryegrass. Pronamide and pyroxasulfone provide 100% control of Italian ryegrass, and weed dry weight was reduced by up to 79 % compared to the grower standard. This study documents that hazelnuts are tolerant to pronamide, pyroxasulfone, and S-metolachlor, and that these herbicides can improve weed management in young orchards.

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Sugarbeet tolerance when dimethenamid-P follows soil-applied ethofumesate and S-metolachlor

Cited by 4 publications

References 34 publications

Ethofumesate applied at greater than labeled rates postemergence to sugarbeet

Ethofumesate applied at greater than labeled rates postemergence to sugarbeet

Environment influences sugarbeet tolerance to S-metolachlor

Hazelnut growth and weed control in response to selected preemergence herbicides

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