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Timing of Herbicide Applications for Control of Larkspurs (Delphinium spp.)

Published online by Cambridge University Press:  12 June 2017

Michael H. Ralphs ,
John O. Evans  and
Steven A. Dewey
Michael H. Ralphs
Affiliation:
USDA, Agric. Res. Serv., U.S. Dep. Agric. Poisonous Plant Res. Lab., 1150 E. 1400 N., Logan, UT 84321
John O. Evans
Affiliation:
Plant Sci., Utah State Univ., Logan, UT 84322
Steven A. Dewey
Affiliation:
Plant Sci., Utah State Univ., Logan, UT 84322
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Abstract

Timing and application rates of herbicides were evaluated for control of duncecap and tall larkspur on mountain rangelands. Picloram, triclopyr, glyphosate, and metsulfuron were applied at three rates during three growth stages (vegetative, bud, and flower) to evaluate the rate by growth stage interaction. Picloram was equally effective over all growth stages when applied at 1.1 or 2.2 kg ae ha−1. Metsulfuron was most effective when applied in the vegetative stage; 0.035 kg ai ha−1 killed 95% of duncecap larkspur, but 0.14 kg ha−1 was required to kill the same percentage of tall larkspur. Glyphosate at ≤ 2.2 kg ai ha−1 was least effective when applied in the flower stage compared to earlier growth stages. Triclopyr showed variable control at rates from 1.1 to 4.5 kg ae ha−1.

Keywords

Glyphosate, N-(phosphonomethyl)glycinemetsulfuron, 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]-amino]sulfonyl]benzoic acidpicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidtriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidduncecap larkspur, Delphinium occidentale S. Wats. #3 DELOCtall larkspur, D. barbeyi (L.) Huth # DELBAPoisonous plantrangelandtriclopyrpicloramglyphosatemetsulfuronDELOCDELBA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 40 , Issue 2 , June 1992 , pp. 264 - 269
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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