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Goatsrue (Galega officinalis) Response to Herbicides

Published online by Cambridge University Press:  20 January 2017

Michelle Oldham  and
Corey V. Ransom
Michelle Oldham
Affiliation:
Plants, Soils, and Climate Department, Utah State University, 4820 Old Main Hill, Logan, UT 84322-4820
Corey V. Ransom*
Affiliation:
Plants, Soils, and Climate Department, Utah State University, 4820 Old Main Hill, Logan, UT 84322-4820
*
Corresponding author's E-mail: corey.ransom@usu.edu
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Abstract

Goatsrue response to eight herbicide treatments was evaluated in greenhouse and field trials. Herbicides tested on goatsrue grown from seed in the greenhouse included 2,4-D amine, dicamba, chlorsulfuron, picloram, imazapyr, imazamox, aminopyralid, and triclopyr. Each herbicide was applied at rates of 0.125×, 0.25×, 0.5×, 1.0×, and 2.0×, where X is equal to the labeled rate. Goatsrue was most sensitive to the acetolactate synthase inhibitors chlorsulfuron and imazapyr, with 50% inhibition values of 0.07× (3.7g ai ha−1) and 0.16× (90 g ai ha−1) respectively. Goatsrue did not respond to increasing 2,4-D and imazamox rates. Herbicides evaluated in the greenhouse were also tested at two field sites (Smithfield and Amalga, UT), except imazamox, which was replaced by metsulfuron. Field studies gave some varying results, but overall showed that chlorsulfuron, metsulfuron, aminopyralid, and picloram gave at least 93% control at Smithfield, and 89% control at Amalga 24 mo after treatment (MAT). Treatments of chlorsulfuron, metsulfuron, aminopyralid, and picloram were also effective at increasing perennial grass cover at Smithfield 24 MAT. All treatments at Smithfield decreased seedling goatsrue cover, whereas only aminopyralid and picloram decreased seedling cover at Amlaga 11 MAT.

La respuesta de Galega officinalis a ocho tratamientos de herbicidas fue evaluada en estudios de invernadero y de campo. Los herbicidas probados en G. officinalis proveniente de semillas de plantas cultivadas en invernadero, incluyeron; 2,4-D amina, dicamba, clorsulfurón, picloram, imazapyr, imazamox, aminopyralid, y triclopyr. Cada uno se aplicó en dosis de 0.125×, 0.25×, 0.5×, 1.0×, y 2.0×, donde X es igual a la dosis recomendada en la etiqueta. La G. officinalis fue más sensible a los inhibidores de ALS clorsulfurón e imazapyr, con valores I50 de 0.07× (3.7 g ia/ha) y 0.16× (90 g ia/ha), respectivamente. La G. officinalis no respondió al incremento de las dosis de 2,4-D e imazamox. Los herbicidas evaluados en invernadero fueron también probados en dos sitios (Smithfield y Amalga, UT) con excepción de imazamox, el cual fue substituido por metsulfurón. Los estudios de campo proporcionaron algunos resultados inconsistentes, pero en general mostraron que clorsulfurón, metsulfurón, aminopyralid y picloram, lograron al menos 93% de control en Smithfield, y 89% de control en Amalga, 24 meses después del tratamiento (MAT). Los tratamientos de clorsulfurón, metsulfurón, aminopyralid y picloram, también fueron efectivos al incrementar la cobertura del zacate perenne en Smithfield, 24 MAT. Todos los tratamientos en esta última localidad, disminuyeron la cobertura de las plántulas de G. officinalis, mientras que solamente el aminopyralid y el picloram provocaron el mismo resultado en Amalga, 11 MAT.

Keywords

2,4-D aminedicambachlorsulfuronpicloramimazapyrimazamoxaminopyralidtriclopyrmetsulfurongoatsrue, Galega officinalis L.Dose responseperennial weedgrass recoveryweed coverweed controlALS inhibitorgrowth regulator
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 1 , March 2011 , pp. 70 - 76
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: 4237 Knollvale Drive, Colorado Springs, CO 80922.

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