Weed Control in Irrigated Seedling Alfalfa (<i>Medicago sativa</i>)

Wilson, R. G.

doi:10.1017/s0043174500067114

Cited by 11 publications

(12 citation statements)

References 8 publications

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“…All herbicides provided >96% control of the annual broadleaf weeds evaluated in this research. These data are in agreement with other studies that have reported excellent annual broadleaf weed control with each of these herbicide treatments in alfalfa (Fawcett and Harvey, 1978; Johnson et al, 2001; McCordick et al, 2008; Wilson, 1986).…”

Section: Resultssupporting

confidence: 92%

Influence of Seeding Rate and Herbicide Treatments on Weed Control, Yield, and Quality of Spring‐Seeded Glyphosate‐Resistant Alfalfa

2010

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Field trials were conducted in 2005 and 2006 in central and southwest Missouri to investigate the eff ect of seeding rate and herbicide programs on weed control, forage quality, and yield within the year of establishment in spring seeded glyphosate-resistant (GR) alfalfa (Medicago sativa L.). In all experiments, EPTC (4.4 kg ha -1 ), 2,4-DB plus sethoxydim (1.1 plus 0.21 kg ha -1 ), imazamox (0.043 kg ha -1 ) and glyphosate (0.86 kg ae ha -1 ) were applied to GR alfalfa that was seeded at 4.5, 8.9, 13.5, and 18 kg ha -1 . Across all locations, the glyphosate application provided good control of weeds regardless of alfalfa seeding rate. When applied at the same timing, imazamox provided similar levels of annual broadleaf weed control as glyphosate, while 2, 4-DB plus sethoxydim provided similar levels of annual grass and broadleaf weed control as glyphosate. Neither glyphosate nor the conventional herbicide treatments reduced alfalfa stem density between the fi rst and last annual harvests, but 2, 4-DB plus sethoxydim resulted in the most visual injury to seedling alfalfa stands and lowered initial yields at all locations. In addition, alfalfa annual yields were similar or higher in the glyphosate treatment compared to the other herbicide programs. Harvested forage in the herbicide treatments generally had greater crude protein (CP) content than the untreated control forage. Application of glyphosate resulted in similar or higher forage CP content compared to conventional herbicide treatments. In vitro true digestibility of the harvested GR alfalfa ranged from 750 to 860 g kg -1 DM at all locations with few diff erences across herbicide treatments.

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Section: Resultssupporting

confidence: 92%

Influence of Seeding Rate and Herbicide Treatments on Weed Control, Yield, and Quality of Spring‐Seeded Glyphosate‐Resistant Alfalfa

2010

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“…Research has shown that postemergence application of chlorsulfuron can injure seedling as well as estab lished alfalfa (6) and its residues in the soil can inhibit nodulation and growth of alfalfa (7). Injury to alfalfa from 2,4-D, glyphosate, and bromoxynil was reported when these herbicides were applied at relatively high rates (3,4,6,11,12). However, the response of alfalfa to these and sulfonylurea herbicides as might occur from herbicide drift has not been documented.…”

Section: Herbicide Drift Can Injure Plants Considerable Dis Tance Dowmentioning

confidence: 99%

Alfalfa (Medicago sativa) Response to Simulated Herbicide Spray Drift

Al‐Khatib¹,

Parker

Fuerst

1992

Weed technol.

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‘Vernal’ alfalfa response was evaluated when chlorsulfuron, thifensulfuron, 2,4-D, glyphosate, bromoxynil, and selected combinations of those herbicides were applied at rates simulating spray drift during the fourth trifoliolate leaf stage following the first cutting in 1990 and 1991. The order of phytotoxicity was 2,4-D > chlorsulfuron > thifensulfuron > glyphosate > bromoxynil. By the end of each growing season, alfalfa had recovered from injury caused by all herbicides except the highest rates of 2,4-D and 2,4-D plus glyphosate. The alfalfa stand was reduced only by 2,4-D and 2,4-D plus glyphosate. All herbicides caused characteristic symptoms, but some specific symptoms were similar among different herbicides or resembled symptoms caused by disease, mineral imbalance, and adverse weather conditions.

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“…When imazethapyr rate was increased to 140 glha the addition ofUAN to the spray solution increased all legume injury. Legume density was not reduced by POST applications of imazethapyt Cicer milkvetch and yellow sweetclover density 20 OAT increased with POST application of imazethapyr, probably the result of weed control which has previously been shown to enhance legume establishment (15).…”

Section: Resultsmentioning

confidence: 84%

“…\\eeds pose a major production problem in legumes where they compete for water, nutrients, and light and reduce forage quality. \\eeds in new alfalfa seedings can decrease legume stands (15). As weeds increase, the alfalfa percentage in forage declines (8).…”

Section: Introductionmentioning

confidence: 99%

“…If the harvested weed is low in forage quality, the forage quality normally declines as the weed percentage increases (2,3,8,11). Results from several experiments have shown that herbicides can be used to control weeds selectively in seedling alfalfa (6,10,15). Recently imazethapyr has shown the potential to control weeds selectively in alfalfa and other legumes (9,16).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Imazethapyr on Legumes and the Effect of Legumes on Weeds

Wilson

1994

Weed technol.

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A three-year experiment was conducted near Scottsbluff, NE, to evaluate the selectivity of POST-applied imazethapyr for weed control in alfalfa, birdsfoot trefoil, cicer milkvetch, red clover, sainfoin, and yellow sweetclover. Imazethapyr injured all legumes 15 DAT. Imazethapyr also reduced the height of birdsfoot trefoil, cicer milkvetch, red clover, and yellow sweeclover 28 DAT. Legume first cutting yields were not reduced by imazethapyr and with alfalfa, birdsfoot trefoil, cicer milkvetch, and sainfoin, first cutting yields were increased by imazethapyr. Imazethapyr reduced weed biomass in all legume seedings. Weed biomass in new seedings of alfalfa was reduced more than that of the other legumes.

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Weed Control in Irrigated Seedling Alfalfa (Medicago sativa)

Cited by 11 publications

References 8 publications

Influence of Seeding Rate and Herbicide Treatments on Weed Control, Yield, and Quality of Spring‐Seeded Glyphosate‐Resistant Alfalfa

Influence of Seeding Rate and Herbicide Treatments on Weed Control, Yield, and Quality of Spring‐Seeded Glyphosate‐Resistant Alfalfa

Alfalfa (Medicago sativa) Response to Simulated Herbicide Spray Drift

Effect of Imazethapyr on Legumes and the Effect of Legumes on Weeds

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