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Control of Rayless Goldenrod (Isocoma wrightii) with Soil-Applied Herbicides

Published online by Cambridge University Press:  12 June 2017

Darrell N. Ueckert ,
Steven G. Whisenant  and
George W. Sultemeier
Darrell N. Ueckert
Affiliation:
Texas Agric. Exp. Stn., Rt. 2, Box 950, San Angelo, TX 76901
Steven G. Whisenant
Affiliation:
Texas Agric. Exp. Stn., Rt. 2, Box 950, San Angelo, TX 76901
George W. Sultemeier
Affiliation:
Texas Agric. Ext. Serv., Fort Stockton, TX 79735
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Abstract

Picloram (4-amino-3,5,6-trichloropicolinic acid) applied at 0.6 to 1.2 kg/ha as 5 or 10% pellets during the summer or fall usually killed 90% or more of the rayless goldenrod [Isocoma wrightii (Gray) Rydb.] on sandy loam soils in western Texas, whereas the higher rates were necessary for 80% or greater control following winter applications. Acceptable control persisted for 4 yr. Applications of tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea}at 1.1 kg/ha as 20% pellets during summer controlled 85% of the rayless goldenrod, but summer applications of tebuthiuron at 0.6 kg/ha or winter applications at 0.6 or 1.1 kg/ha did not control the weed effectively. Dicamba (3,6-dichloro-o-anisic acid) applied at 0.6 or 1.1 kg/ha as 5% granules did not control rayless goldenrod. Prescribed burning in late February reduced the density of rayless goldenrod 18 to 41%, but decreased control with soil-applied picloram or tebuthiuron. Reduction in rayless goldenrod densities of 75% or greater following applications of picloram or tebuthiuron pellets more than doubled the estimated carrying capacity of the arid rangeland.

Keywords

Rangelandforage responsetoxic plants
Type
Research Article
Information
Weed Science , Volume 31 , Issue 2 , March 1983 , pp. 143 - 147
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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