Absorption, translocation, and metabolism of halosulfuron and trifloxysulfuron in green kyllinga (Kyllinga brevifolia) and false-green kyllinga (K. gracillima)

McElroy, Joseph; Yelverton, Fred H.; Burke, Ian C.; Wilcut, John W.

doi:10.1614/ws-03-133r

Cited by 19 publications

(29 citation statements)

References 25 publications

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“…En el caso de estos dos últimos herbicidas, es importante notar que aún cuando síntomas como clorosis y necrosis tardaron en manifestarse, el retraso en el crecimiento en las plantas aplicadas fue notorio desde la primera evaluación. Esto se debe a que el herbicida es absorbido en las siguientes cuatro horas después de la aplicación y su efecto herbicida es casi inmediato, dejando la planta de crecer; sin embargo la muerte del tejido se observa luego de un tiempo mucho más prolongado (McElroy et al 2004).…”

Section: Resultados Y Discusión Aplicación Sobre Navajuela En Estado unclassified

Control químico de la navajuela (Scleria melaleuca Rchb.f.ex.Schltdk.Cham.) en diferentes estados de desarrollo

2006

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RESUMENControl químico de la navajuela (Scleria melaleuca Rchb.f.ex.Schltdk.Cham.) en diferentes estados de desarrollo. Se evaluó el control de la navajuela en cuatro diferentes estados de desarrollo: (1) dos a tres hojas, (2) inicio del macollamiento, (3) rebrote en cepas adultas luego de cinco semanas de haber sido cortadas con cortadora de motor y (4) cepa adulta o madura. El quinto ensayo combinó cepas adultas y cepas en rebrote. Durante los años 2002-2005 se realizaron cinco ensayos en Pococí, Limón, dos en invernadero y tres en el campo. Se encontró que la manera más efi caz de eliminar la navajuela sin afectar el pasto fue la aplicación de herbicidas selectivos al pasto, como halosulfuron (75 g/ha), bentazón + MCPA (1.150 g/ha de la mezcla formulada) y ethoxysulfuron (75 g/ha), cuando la maleza se encontraba en estado de dos a tres hojas, lo cual se puede lograr cuando se realiza renovación de pasturas. Por otro lado, para controlar la cepa madura de navajuela fue necesario utilizar herbicidas de amplio espectro, como el diurón + paraquat y el glifosato. Con el glifosato se logró un excelente control tanto en aplicaciones por aspersión como de manera untada o por contacto, con la ventaja de que este último método redujo el daño a la pastura.Palabras clave: Navajuela, Scleria melaleuca, pastos, control de malezas, Cyperaceae. ABSTRACTCutting edge (Scleria melaleuca Rchb.f.ex.Schltdl. Cham.) control in different growth stages. The cutting edge (Scleria melaleuca) control in four different growth stages: (1) 2-3 leaves, (2) tillering, (3) sprout of mature plants after a mown and (4) mature plant, was evaluated. A fi fth treatment included mature and sprouting plants. Two greenhouse and three fi eld trials where established during 2002-2005 at Pococí, Limón. We found that the most effective method for S. melaleuca control was the application of the pasture selective herbicides halosulfuron (75 g/ha), bentazon + MCPA (1150 g/ha of formulated mix) and ethoxysulfuron (75 g/ha) during the 2-3 leaves growth stage. This can be done in a pasture renewal system. On the other hand, application of the broad spectrum herbicides diuron + paraquat (200+480 g/ha) and glyphosate (1400 g/ha) was effective in the control of mature cutting edge plants. Glyphosate was sprayed and also applied using contact equipment (18 g/l), to avoid herbicide effects on pastures. Even though both treatments were effective in controlling cutting edge, the contact method produced good weed control without major pasture damage.

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Section: Resultados Y Discusión Aplicación Sobre Navajuela En Estado unclassified

Control químico de la navajuela (Scleria melaleuca Rchb.f.ex.Schltdk.Cham.) en diferentes estados de desarrollo

2006

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“…Potential herbicide degradation due to the extraction process was not evaluated, as McElroy et al (2004) reported >98% of recovered radioactivity in the form of halosulfuron-methyl for leaves spotted with [ 14 C]halosulfuron-methyl and immediately processed. Statistical analysis was similar to the absorption and translocation study.…”

Section: Methodsmentioning

confidence: 99%

“…and false green kyllinga ( Kyllinga gracillima Miq. ), with 47% of applied [ 14 C]halosulfuron-methyl absorbed by 4 h after treatment (HAT) and 77% of absorbed herbicide remaining in the form of the parent compound by 96 HAT, mostly in the treated leaf and primary shoot (McElroy et al 2004). Tolerance of wheat ( Triticum spp.)…”

mentioning

confidence: 99%

Absorption, Translocation, and Metabolism of Halosulfuron in Cucumber, Summer Squash, and Selected Weeds

Besançon

Jennings²,

Everman³

2017

Weed Sci

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Greenhouse studies were conducted to investigate the absorption, translocation, and metabolism of foliar-applied [14C]halosulfuron-methyl in cucumber, summer squash, pitted morningglory, and velvetleaf. Cucumber and summer squash were treated at the 4-leaf stage, whereas velvetleaf and pitted morningglory were treated at 10 cm. All plants were collected at 4, 24, 48, and 72 h after treatment (HAT) for absorption and translocation studies and an additional 96-HAT interval was included in the metabolism study. Absorption did not exceed 45% in summer squash, whereas it plateaued around 60% in velvetleaf and cucumber and reached 80% in pitted morningglory 72 HAT. None of the four species translocated more than 23% of absorbed halosulfuron out of the treated leaf. Translocation in cucumber and summer squash was predominantly basipetal, while acropetal movement prevailed in velvetleaf. No significant direction of movement was observed for pitted morningglory. Negligible translocation occurred toward the roots, regardless of plant species. Of the total amount of [14C]halosulfuron-methyl absorbed into the plants at 96 HAT, more than 80% remained in the form of the parent compound in velvetleaf, summer squash, and pitted morningglory, whereas less than 20% was detected in cucumber. Rapid and high herbicide metabolism may explain cucumber tolerance to halosulfuron-methyl, while lack of metabolism contributes to summer squash and velvetleaf susceptibility. Pitted morningglory tolerance may be due to limited translocation associated with some level of metabolism, but further research would be needed to investigate other potential causes.

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“…Halosulfuron-methyl interferes with acetolactate synthase enzyme, resulting in a rapid cessation of cell division and plant growth in both roots and shoots (McElroy et al 2004). Halosulfuron-methyl is slightly volatile and unstable in the environment.…”

Section: Introductionmentioning

confidence: 99%

Determination of halosulfuron-methyl residues and dissipation in wheat by QuEChERS and LC-MS/MS

Feng¹,

Li²,

Hao³

et al. 2014

Food Additives & Contaminants: Part A

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A sensitive and rapid analytical method based on QuEChERS (quick, easy, cheap, effective, rugged and safe) sample preparation and LC-MS/MS detection was developed for the analysis of halosulfuron-methyl residues in wheat. The recoveries of halosulfuron-methyl in both the wheat plant and grain ranged from 87% to 119% and from 75% to 97%, respectively, with relative standard deviations (RSDs) of 3-9%. The limit of quantification (LOQ) was 0.005 mg kg(-1) for wheat plant and 0.001 mg kg(-1) for wheat grain. The half-life of halosulfuron-methyl in the wheat plant was 0.9-9.5 days. The terminal residue levels of halosulfuron-methyl in wheat grain were below 0.01 mg kg(-1) at harvest.

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Absorption, translocation, and metabolism of halosulfuron and trifloxysulfuron in green kyllinga (Kyllinga brevifolia) and false-green kyllinga (K. gracillima)

Cited by 19 publications

References 25 publications

Control químico de la navajuela (Scleria melaleuca Rchb.f.ex.Schltdk.Cham.) en diferentes estados de desarrollo

Control químico de la navajuela (Scleria melaleuca Rchb.f.ex.Schltdk.Cham.) en diferentes estados de desarrollo

Absorption, Translocation, and Metabolism of Halosulfuron in Cucumber, Summer Squash, and Selected Weeds

Determination of halosulfuron-methyl residues and dissipation in wheat by QuEChERS and LC-MS/MS

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