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Difficulty in Controlling Duncecap Larkspur (Delphinium occidentale)

Published online by Cambridge University Press:  12 June 2017

Michael H. Ralphs  and
David L. Turner
Michael H. Ralphs
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Poisonous Plant Res. Lab., 1150 E. 1400 N., Logan, UT 84321
David L. Turner
Affiliation:
Utah State Univ., Logan, UT 84322
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Abstract

Duncecap larkspur was not killed by triclopyr, picloram, or clopyralid applied once at recommended rates. Triclopyr at 1.1, 1.7, 2.2, and 4.6 kg ae/ha applied twice to the same plots in two consecutive years reduced duncecap larkspur density from 29 to 64%. However, the higher rates of triclopyr left 2 plants/m2, an unacceptable level for preventing cattle poisoning.

Keywords

Clopyralid, 3,6-dichloro-2-pyridinecarboxylic acid; picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidtriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy] acetic acidduncecap larkspur, Delphinium occidentale S. Wats. #3 DELOCPoisonous plantrangeland
Type
Research
Information
Weed Technology , Volume 3 , Issue 2 , June 1989 , pp. 335 - 339
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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