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Controlling Honey Locust (Gleditsia triacanthos) with Cut Stump- and Basal Bark-Applied Herbicides for Grazed Pasture

Published online by Cambridge University Press:  20 January 2017

Keith R. Harmoney
Keith R. Harmoney*
Affiliation:
Kansas State University Western Kansas Agricultural Research Center, 1232 240th Avenue, Hays, KS, 67601
*
Corresponding author's E-mail: [email protected]
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Abstract

Honey locust is a deciduous tree that is now present throughout most of the United States. Fire suppression and introduction of honey locust into shelter belts has allowed honey locust to increase in pastures of mixed grass prairie. Because locust trees can produce abundant sprouts, mechanical measures also require herbicides to effectively control trees. Each year for 2 yr, trees were treated with one of five combinations of herbicides and application methods. Treatment combinations, on a v/v basis, included (1) triclopyr 25% + diesel 75% and (2) aminopyralid 5% + bark oil 95%, both applied to the lower 38 cm of basal bark including the root collar area of live trees, as well as (3) triclopyr 25% + diesel 75%, (4) aminopyralid 10% + water 90%, and (5) dicamba 33% + 2,4-D 2% + water 65%, all applied immediately to the outer cambium layer of cut stump surfaces. One year after treatment, aminopyralid applied as a basal bark or as a cut-tump treatment had the best control and averaged over 97% dead trees. The triclopyr + diesel cut-stump treatment had the fewest dead trees (just over 50%) and produced many new sprouts. In grazed pasture, treating cut tree surfaces with dicamba + 2,4-D + water or aminopyralid + water and treating standing live trees with a basal bark application of aminopyralid + oil are three effective control options. Triclopyr + diesel displayed better control on live standing trees with a basal bark treatment rather than as a cut-stump treatment.

Gleditsia triacanthos es un árbol deciduo que está presente a lo largo de la mayoría de los Estados Unidos. La supresión con fuego y la introducción de G. triacanthos en fajas de refugio ha permitido el incremento de esta maleza en pastizales con mezclas de especies gramíneas de pradera. Porque los árboles de G. triacanthos producen rebrotes abundantes, medidas de control mecánicas también requieren herbicidas para el control efectivo de los árboles. Cada año, por 2 años, árboles fueron tratados con una de cinco combinaciones de herbicidas y métodos de aplicación. Los tratamientos de combinaciones, con base en v/v, incluyeron (1) triclopyr 25% + diesel 75% y (2) aminopyralid 5% + aceite de corteza 95%, ambos aplicados en los 38 cm inferiores de la base de la corteza incluyendo el área del collar de la raíz de árboles vivos, además de (3) triclopyr 25% + diesel 75%, (4) aminopyralid 10% + agua 90%, y (5) dicamba 33% + 2,4-D 2% + agua 65%, todos aplicados inmediatamente a la capa externa del cambium en la superficie del corte en el tocón. Un año después del tratamiento, aminopyralid aplicado a la corteza basal o al corte del tocón tuvo el mejor control y promedió más de 97% de árboles muertos. El tratamiento triclopyr + diesel sobre el tocón tuvo el menor número de árboles muertos (un poco sobre 50%) y produjo muchos rebrotes nuevos. En pastos con pastoreo, el tratar la superficie de los árboles cortados con dicamba + 2,4-D + agua o aminopyralid + agua y el tratar árboles vivos en pie con una aplicación a la base de la corteza con aminopyralid + aceite son tres opciones efectivas de control. Triclopyr + diesel mostró el mejor control en árboles vivos en pie con un tratamiento en la base de la corteza en lugar del tratamiento sobre el corte en el tocón.

Keywords

Aminopyralid2,4-Ddicambatriclopyrhoney locust, Gleditsia triacanthos L. GLTRMixed grass rangelandroot collarsprouts
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 3 , September 2016 , pp. 801 - 806
Copyright
Copyright © Weed Science Society of America 

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Footnotes

∗ Contribution number 16-129-J from the Kansas Agricultural Experiment Station, Manhattan, KS.
Associate Editor for this paper: Ian Burke, Washington State University.

References

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