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Small Burnet Response to Spring and Fall Postemergence Herbicide Applications

Published online by Cambridge University Press:  20 January 2017

Ryan L. Nelson ,
Michael D. Peel  and
Corey V. Ransom
Ryan L. Nelson
Affiliation:
Department of Plant Soils and Climate, Utah State University, Logan, UT 84322
Michael D. Peel*
Affiliation:
USDA, ARS-FRRL, Logan, UT 84322
Corey V. Ransom
Affiliation:
Department of Plant Soils and Climate, Utah State University, Logan, UT 84322
*
Corresponding author's E-mail: [email protected].
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Abstract

Small burnet is a hardy, relatively long-lived evergreen forb with the potential to improve grazing lands, particularly to extend grazing into late fall and winter. Small burnet was evaluated for tolerance to spring and fall POST applications of aminopyralid, bromoxynil, clethodim, clopyralid, dicamba, dimethenamid-P, imazamox, metribuzin, pendimethalin, quinclorac, and 2,4-DB. Injury, seed yield, seed viability, and dry matter yield (DMY) were measured in the spring following application. Injury was observed in response to all spring and fall herbicide applications. Injury from aminopyralid was the highest for both spring and fall applications at 24 and 79%, respectively. Fall application of imazamox and dicamba resulted in 57 and 31% injury, respectively. Spring-applied aminopyralid and 2,4-DB both reduced DMY by 16%, whereas fall applications of imazamox, dicamba, and aminopyralid reduced DMY by 36, 12, and 67%, respectively. Fall applications of imazamox and aminopyralid reduced seed yield by 33 and 65%, respectively. Fall-applied aminopyralid reduced seed germination by 43%. None of the spring-applied herbicides affected seed yield or seed germination. Small burnet is severely injured by aminopyralid and to a lesser degree by imazamox and dicamba. Bromoxynil, clethodim, clopyralid, dimethenamid-P, metribuzin, pendimethalin, and quinclorac did not affect small burnet DMY, seed yield, or germination the year after application.

Sanguisorba minor es un arbusto siempre verde de ciclo de vida relativamente largo y resistente a condiciones adversas con el potencial de mejorar tierras para pastoreo, particularmente para extender el período de pastoreo hasta el final del otoño y el invierno. Se evaluó la tolerancia de S. minor a aplicaciones POST en la primavera y el otoño de aminopyralid, bromoxynil, clethodim, clopyralid, dicamba, dimethenamid-P, imazamox, metribuzin, pendimethalin, quinclorac, y 2,4-DB. Se midió el daño, el rendimiento de semilla, la viabilidad de la semilla, y el rendimiento de materia seca (DMY) en la primavera siguiente a la aplicación. Se observó daño en respuesta a todas las aplicaciones hechas en la primavera y en el otoño. El mayor daño fue causado por aminopyralid siendo 24% en las aplicaciones de primavera y 79% en las de otoño. Las aplicaciones de otoño de imazamox y dicamba resultaron en 57 y 31% de daño, respectivamente. Aminopyralid y 2,4-DB aplicados en la primavera redujeron DMY en 16% mientras que las aplicaciones de otoño de imazamox, dicamba y aminopyralid redujeron DMY en 36, 15 y 67%, respectivamente. Las aplicaciones de imazamox y aminopyralid redujeron el rendimiento de semilla en 33 y 65%, respetivamente. Aplicaciones en otoño de aminopyralid redujeron la germinación de la semilla en 43%. Ninguna de los herbicidas aplicados en la primavera afectaron el rendimiento de semilla ni su germinación. S. minor es dañado severamente por aminopyralid en menor grado por imazamox y dicamba. Bromoxynil, clethodim, clopyralid, dimethenamid-P, metribuzin, pendimethalin, y quinclorac no afectaron DMY, el rendimiento de semilla o la germinación de S. minor el año siguiente a la aplicación.

Keywords

2,4-DBaminopyralidbromoxynilclethodimclopyraliddicambadimethenamid-Pimazamoxmetribuzinpendimethalinquincloracsmall burnet, Sanguisorba minor scopField trialherbicide injuryseed productionseed viabilitysmall burnettolerance
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 1 , March 2014 , pp. 168 - 175
Copyright
Copyright © Weed Science Society of America 

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