History of Sugarbeet (<i>Beta vulgaris</i>) Herbicide Rate Reduction in North Dakota and Minnesota

Dexter, A. G.

doi:10.1017/s0890037x00038884

Cited by 16 publications

(27 citation statements)

References 3 publications

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“…However, in this experiment weed seedlings from both species continued to emerge after the last microrate application, suggesting that additional microrate applications should be considered to control later flushes and may be used to replace the standard bromoxynil plus oxyfluorfen application when onion are at the two-to five-leaf stages. Similar results were reported in sugarbeet, where it was found that some fields required additional applications to control late-emerging weeds (Dexter 1994). These observations of multiple emergence events support the results of Grundy et al (2003) that showed that predictive emergence models had failed to detect additional flushes of common lambsquarters because they did not take into account unusual weather conditions.…”

Section: Resultssupporting

confidence: 82%

Multiple Applications of Reduced-Rate Herbicides for Weed Control in Onion

Loken

Hatterman‐Valenti

2010

Weed technol.

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Field experiments were conducted at Oakes, Absaraka, and Tappen, ND, in 2006 and repeated at Oakes and Absaraka, ND, in 2007 to evaluate early season weed control of common lambsquarters and redroot pigweed in onion with POST herbicides applied at multiple reduced rates (microrates) and to determine whether microrate herbicide treatments effectively reduced early season broadleaf weed competition, caused crop injury, or affected yield. Application rates of bromoxynil, oxyfluorfen, metribuzin, and acifluorfen were reduced to 0.25, 0.13, and 0.06× of their lowest labeled rate and applied in sequential applications (every 7 d) either two or three times. The 0.25× rate of bromoxynil (70.1 g ae/ha) provided the greatest control of common lambsquarters (95%). The 0.25× rates of bromoxynil and oxyfluorfen (70.1 g ai/ha) provided the greatest control of redroot pigweed (93 and 85%, respectively). Microrate applications of metribuzin or acifluorfen did not effectively control common lambsquarters or redroot pigweed. In 2006, no onion injury was observed. However, in 2007, applications of oxyfluorfen resulted in approximately 15% injury, regardless of the herbicide rate or the number of applications. Plants outgrew symptoms by 4 wk after treatment and were similar to the untreated plants. Onion treated with oxyfluorfen had the greatest total yield, followed by onion treated with bromoxynil. Onion treated with acifluorfen had a greater total marketable bulb yield than onion treated with metribuzin, but yield was considered poor compared to the other herbicide treatments. Three microrate applications provided greater weed control and increased yield compared with two applications across herbicides and rates. Results suggest that microrate applications of bromoxynil and oxyfluorfen will provide early season broadleaf weed control in onion.

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Section: Resultssupporting

confidence: 82%

Multiple Applications of Reduced-Rate Herbicides for Weed Control in Onion

Loken

Hatterman‐Valenti

2010

Weed technol.

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“…POST herbicides were applied two or three times, and application rates each time were 50% of the single POST application rate. Desmedipham applied at 0.28 kg/ha 7 to 14 d later controlled weeds and injured sugarbeet less than desmedipham applied at 1.12 kg/ha or split applications of desmedipham at 0.56 fb 0.56 kg/ha (Dexter 1994). POST applications of desmedipham at 0.28 fb 0.28 kg/ha were widely used from 1980 to 1998 and were the primary POST weed control option.…”

Section: Introductionmentioning

confidence: 99%

Effect of Herbicides on Weed Control and Sugarbeet (Beta vulgaris) Yield and Quality

Dale

Renner²,

Kravchenko³

2006

Weed technol.

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The “micro-rate” application, a POST combination of desmedipham plus phenmedipham at 0.045 + 0.045 kg ai/ha (desphen) or desmedipham plus phenmedipham plus ethofumesate (1:1: 1 ratio) (desphenetho) at 0.09 kg ai/ha plus triflusulfuron at 0.004 kg ai/ha plus clopyralid at 0.026 kg ae/ha plus 1.5% methylated seed oil received registration in 1998 and 2000 in North Dakota and Michigan, respectively. Herbicide rates are reduced by 80%, compared to standard-split applications, and growers typically apply the micro-rate three to five times to very small weeds that are 1 cm or less in height. In standard-split applications, growers make two sequential applications, the first when weeds are 1.5 cm tall and the sequential application usually 10 to 14 d later. Research was conducted in small plots and large grower plots in 2001 and 2002 to determine the effect of PRE herbicides on weed control and sugarbeet injury from micro-rates compared to standard-split POST herbicide applications. Sugarbeet populations were reduced in the cycloate treatment compared to all other PRE and the no-PRE treatment in 2001 and in the S-metolachlor compared to the ethofumesate treatment in 2002. Sugarbeet injury was 6% or less from POST-only treatments in 2001. Control of common lambsquarters and Amaranthus spp. by desphen and desphenetho treatments was similar. Sugarbeet injury in 2002 was 29 to 43% from POST-only treatments. The standard-split of desphenetho was more injurious than the standard-split of desphen. Common lambsquarters control was greater in both the standard-split and micro-rate of desphenetho compared to the standard-split of desphen in 2002. However, sugarbeet populations and recoverable white sucrose per hectare did not differ among POST herbicide treatments in either year. No herbicide program provided 100% control of all weeds in both years. In the seven large production fields, PRE herbicide treatments did not reduce sugarbeet populations or recoverable sucrose per hectare compared to the no-PRE control. Weed control from four POST micro-rate applications only was similar to weed control in instances in which PRE herbicides were applied prior to the POST micro-rate applications.

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“…T 1, T 2 , and T 3 -first, second, and third application. Herbicides, Agronomic Crops and Weed Biology of a herbicide over a wide range of rates, growers will have better information to determine the appropriate weed management program that maximizes net returns and minimizes loading of herbicides into the environment [57]. Reducing the recommended dose of herbicides is one of the important instruments in weed management systems.…”

Section: Sensitivity Of Weeds To Low Rates Of Phenmedipham Desmediphmentioning

confidence: 99%

Evaluation of Pre- and Postemergence Herbicide Combinations for Broadleaved Weeds in Sugar Beet

Deveikytė¹,

Šarūnaitė²,

Seibutis³

2015

Herbicides, Agronomic Crops and Weed Biology

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Lithuania sugar beet growers have few herbicide options available for weed management. Six field trials were conducted at the Institute of Agriculture, Lithuania, in order to evaluate the effects of chemical weed management in sugar beet. Treatments included untreated and hand-weeded control and several rates of phenmedipham plus desmedipham plus ethofumesate, phenmedipham, ethofumesate, triflusulfuron, chloridazon, and metamitron. Pre-and postemergence and only postemergence applications similarly affected weed control. Phenmedipham plus desmedipham plus ethofumesate was more effective for controlling weeds when applied in combination with metamitron, triflusulfuron, and chloridazon. The significantly lowest efficacy for weed control was phenmedipham combined with ethofumesate and metamitron as compared to the phenmedipham plus desmedipham plus ethofumesate. Reducing the doses of phenmedipham plusdesmedipham plus ethofumesate from 114+89+140 g a.i. ha -1 to 91+71+112 g a.i. ha -1 and 68+53+84 g a.i. ha -1 in mixture with triflusulfuron resulted in the increase of weed biomass. Full (45 g a.i. ha -1 ) and reduced doses (30 g a.i. ha -1 ) of triflusulfuron with phenmedipham plus desmedipham plus ethofumesate similarly affected weeds. The herbicides investigated did not have any negative influence on sugar beet productivity and quality.

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History of Sugarbeet (Beta vulgaris) Herbicide Rate Reduction in North Dakota and Minnesota

Cited by 16 publications

References 3 publications

Multiple Applications of Reduced-Rate Herbicides for Weed Control in Onion

Multiple Applications of Reduced-Rate Herbicides for Weed Control in Onion

Effect of Herbicides on Weed Control and Sugarbeet (Beta vulgaris) Yield and Quality

Evaluation of Pre- and Postemergence Herbicide Combinations for Broadleaved Weeds in Sugar Beet

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