Quackgrass control in established alfalfa with sethoxydim

Twidwell, Edward K.; Kephart, K. D.; Clay, Sharon A.

doi:10.4141/cjps94-116

Cited by 6 publications

(7 citation statements)

References 8 publications

(5 reference statements)

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“…These herbicides control only grass species and, with rare exceptions, act on dicotyledons, which make these compounds highly tolerant (Maneechote et al, 2005). Twidwell et al (1994) observed a large accumulation of dry matter in alfalfa when weeds, mainly grasses, were effectively controlled with herbicides, which demonstrates their importance to alfalfa crops.…”

Section: Herbicide Selectivity In Alfalfa Cropsmentioning

confidence: 96%

Herbicide selectivity in alfalfa crops

et al. 2013

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-This study aimed to determine the selectivity of herbicides applied in pre-and post-emergence for alfalfa crops. Three separate experiments were carried out under greenhouse conditions. The first experiment was arranged in a completely randomized design with three replications in a 4 x 11 + 1 factorial scheme , with eleven herbicides (bentazon, chlorimuron-ethyl, fomesafen, fluazifop-p-butyl, saflufenacil, imazethapyr, clethodim, nicosulfuron, imazaquin, haloxyfop-methyl and MSMA), four doses of each herbicide (0.5 D, 0.75 D, 1.0 D and 1.25 D, where D = recommended dose), plus an untreated control. The products were applied to alfalfa plants at the stage of 4 to 5 leaf pairs. In the second experiment, the effect of pre-emergent herbicides on early alfalfa development was observed through a completely randomized design with five replications in a 3 x 4 x 2 factorial scheme, with three herbicides (hexazinone, atrazine + simazine, S-metolachlor), four doses (0.5 D, 0.75 D, 1.0 D and 1.25 D), and two types of soil texture (loamy and clay soil), plus an untreated control. The third experiment evaluated the action of atrazine, 2,550 g ha -1 ; clomazone -600 g ha -1 ; diclosulam -25 g ha -1 ; diuron+hexazinone -936 + 264 g ha -1 and diuron+hexazinone +sulfometuron -1,386 + 391 + 33.35 g ha -1 on alfalfa sown at different times after herbicide application. The effects of the treatments on alfalfa were evaluated according to visual phytotoxicity symptoms, plant height, and biomass of roots and shoots. Among the herbicides applied at post-emergence, imazethapyr, clethodim, haloxyfop-p-methyl and MSMA were selective for alfalfa, while among those applied at pre-emergence, none were selective, regardless of soil texture. The results of the third experiment showed that the herbicides diclosulam, hexazinone + diuron and atrazine caused less toxicity in alfalfa plants.Keywords: phytotoxicity, Medicago sativa, residual period. (bentazon, chlorimuron-ethyl, fomesafen, fluazifop-p-butil, saflufenacil, imazethapyr, cletodim, nicosulfuron, imazaquim, haloxyfop-methyl e MSMA), quatro doses de cada herbicida (0,5D, 0,75D, 1,0D e 1,25D, sendo D = dose comercial) RESUMO -O objetivo desta pesquisa foi verificar a seletividade de herbicidas aplicados em pré e pós-emergência para a cultura da alfafa. Esta pesquisa foi composta por três experimentos distintos, realizados em casa de vegetação. O primeiro experimento foi conduzido em delineamento experimental inteiramente casualizado com três repetições, em esquema fatorial 11 x 4+1, sendo onze herbicidas

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Section: Herbicide Selectivity In Alfalfa Cropsmentioning

confidence: 96%

Herbicide selectivity in alfalfa crops

et al. 2013

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“…Longer rotations often result in loss of alfalfa vigor, due to harsh winter or summer conditions, or both. Loss of vigor reduces alfalfa's competitive ability, permits more weed growth, and thus reduces weed con-trol benefits for the following crop (Twidwell et a!., 1994). Stand loss due to very wet conditions in 1993 resulted in weedier alfalfa and, in 1994, higher weed seed numbers and seedling densities; however, because weather conditions were excellent for corn growth, corn yield was only moderately reduced.…”

Section: Corn Growth and Yieldmentioning

confidence: 99%

Weed Seedbanks and Corn Growth following Continuous Corn or Alfalfa

Clay

Aguilar²

1998

Agronomy Journal

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Specific crop rotations may reduce weed problems and supplement agrichemical inputs. This study, conducted from 1991 through 1994, compared weed densities and corn (Zea mays L.) growth in continuous corn rotation (C/C) and in an alfalfa (Medicago sativa L.)/alfalfa/corn rotation (A/C) among different input levels (tillage, herbicide, and fertilizer rates varied to achieve high, intermediate, and low treatments). Alfalfa suppressed weeds. During establishment, grass and broadleaf weeds made up about 36 and 10% of the forage biomass, respectively. During the second year, grass and broadleaf weeds made up no more than 17 and 4% of the forage biomass, respectively. Weed seed density in both A/C and C/C corn low‐input plots averaged about 15 000 seeds m−2 in 1993; however, grass seed comprised 73% of the C/C seedbank, but only 26% of the A/C seedbank. In 1994, weed seed density increased to 38 000 seeds m−2 in the low‐input A/C corn, and grass species made up 55% of the seedbank. However, grass densities in A/C and C/C low‐input corn averaged about 300 and 4000 shoots m−2, respectively, each year. No grain was harvested in C/C low‐input corn, due to intense weed competition. Grain yield in A/C low‐input corn was 37% of the A/C high‐input treatment in 1993, 66% of the yield in A/C high‐input treatment in 1994, and similar to yield in the C/C medium‐input treatment both years. Alfalfa in rotation with corn may be used to reduce weed competition while sustaining yield.

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“…Flumetsulam and chlorimuron have also been recommended for controlling burning nettle, swinecress, and common chickweed, which are not controlled by 2,4-DB (Lopez and Romera 1993;Tonks et al 1991). In established alfalfa, clethodim and haloxyfop controlled grasses but did not increase forage yield (Foy and Witt 1992;Twidwell et al 1994). In heavy infestations of downy brome (Bromus tectorum L.), glyphosate also has been recommended for spring applications (Wilson 1997).…”

Section: Introductionmentioning

confidence: 99%

Weed Control in Established Alfalfa (Medicago sativa) with Postemergence Herbicides¹

Arregui¹,

Sánchez²,

Scotta³

2001

Weed Technology

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Field experiments were conducted during 1998, 1999, and 2000 in Santa Fe, Argentina, to evaluate chlorimuron, clethodim, flumetsulam, 2,4-DB, glyphosate, and haloxyfop for control of broadleaf and grass weeds in established alfalfa. Herbicides were applied to alfalfa, 6 to 10 cm in height, after first or second cuttings. Clethodim and haloxyfop were highly effective against bermudagrass, barnyardgrass, and knotroot foxtail, and alfalfa yields were increased. 2,4-DB was effective against Scotch thistle, swinecress, turnipweed, and birdsrape mustard, but no effects were observed on alfalfa yields. Chlorimuron, flumetsulam, and glyphosate were effective against burning nettle, common chickweed, common lambsquarters, spiny cocklebur, and Persian speedwell, but they injured alfalfa and decreased yields.

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Quackgrass control in established alfalfa with sethoxydim

Cited by 6 publications

References 8 publications

Herbicide selectivity in alfalfa crops

Herbicide selectivity in alfalfa crops

Weed Seedbanks and Corn Growth following Continuous Corn or Alfalfa

Weed Control in Established Alfalfa (Medicago sativa) with Postemergence Herbicides¹

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Quackgrass control in established alfalfa with sethoxydim

Cited by 6 publications

References 8 publications

Herbicide selectivity in alfalfa crops

Herbicide selectivity in alfalfa crops

Weed Seedbanks and Corn Growth following Continuous Corn or Alfalfa

Weed Control in Established Alfalfa (Medicago sativa) with Postemergence Herbicides1

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Weed Control in Established Alfalfa (Medicago sativa) with Postemergence Herbicides¹