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Individual Plant Control of Tall Larkspur (Delphinium barbeyi) with Tebuthiuron

Published online by Cambridge University Press:  20 January 2017

Michael H. Ralphs ,
Lee Woolsey  and
James E. Bowns
Michael H. Ralphs*
Affiliation:
USDA/ARS Poisonous Plant Laboratory, 1150 East 1400 North, Logan, UT 84341
Lee Woolsey
Affiliation:
USDA/NRCS, Filmore, UT
James E. Bowns
Affiliation:
Southern Utah University, Cedar City, UT
*
Corresponding author's E-mail: mralphs@cc.usu.edu
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Abstract

A replicated field trial was conducted to determine the effective rates of tebuthiuron for control of individual tall larkspur plants in the mountains near Emery, UT, Cedar City, UT, and Yampa, CO. The size of larkspur plants was measured, and tebuthiuron was applied to the base of each plant at 0.1, 0.21, and 0.5 g product/1,000 cm2 of foliar crown cover. Tebuthiuron at 0.21 g/ 1,000 cm2 rate controlled 62% of the plants. Tebuthiuron at 0.5 g/1,000 cm controlled 78% of the plants (2.5 g for an average-sized plant of 5,000 cm2). The high clay content of the soils at Emery or high organic matter content of soils at Cedar City or Yampa did not adversely affect efficacy.

Keywords

Tebuthiurontall larkspur, Delphinium barbeyi Huth # DELBACattle poisoningpoisonous plant
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 248 - 251
Copyright
Copyright © Weed Science Society of America 

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References

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