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Ericameria austrotexana and Associated Range Forage Responses to Herbicides

Published online by Cambridge University Press:  12 June 2017

H. S. Mayeux Jr. ,
C. J. Scifres  and
R. A. Crane
H. S. Mayeux Jr.
Affiliation:
U.S. Dep. Agric., Sci. Ed. Admin., Agric. Res., Temple, TX 76501
C. J. Scifres
Affiliation:
Dep. Range Sci., Texas Agric. Exp. Stn., College Station, TX 77843
R. A. Crane
Affiliation:
U.S. Dep. Agric., Sci. Ed. Admin., Agric. Res., Temple, TX 76501
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Abstract

Canopy cover of false broomweed (Ericameria austrotexana M.C. Johnston) on the Rio Grande Plains of Texas was initially reduced by 96% by glyphosate [N-(phosphonomethyl)glycine] applied at 2.2 kg/ha in the spring. Acceptable control of this shrub with glyphosate lasted at least 4 yr. Glyphosate severely reduced basal cover of perennial grasses during the year of treatment, but grasses completely recovered within 2 yr after treatment. Standing forage crop increased by an average of 83%, compared to untreated areas, and livestock carrying capacity increased from 1 animal unit (AU)/13 ha to 1 AU/7 ha. Picloram (4-amino-3,5,6-trichloropicolinic acid), paraquat (1,1′-dimethyl-4,4′-bipyridinium ion), and paraquat plus atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] applied in the spring were less effective than glyphosate. Canopy reductions of false broomweed 6 months after applications of 2.2 kg/ha of picloram, paraquat, or paraquat plus atrazine were equivalent to that from 1.1 kg/ha of glyphosate, and control with these herbicides was usually restricted to the season of application. Dicamba (3,6-dichloro-o-anisic acid), 2,4-D-[(2,4-dichlorophenoxy)acetic acid], atrazine, and 2,4-D plus atrazine were not effective when applied in the spring or fall. Time required for recovery of false broomweed canopy apparently varied with amounts of rainfall received after herbicide application.

Keywords

Glyphosaterange weed controlforage responseperennial weedsfalse broomweed
Type
Research Article
Information
Weed Science , Volume 28 , Issue 5 , September 1980 , pp. 602 - 606
Copyright
Copyright © Weed Science Society of America 

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References

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