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Herbicidal Control of Tall Larkspur

Published online by Cambridge University Press:  12 June 2017

Paul J. Torell  and
Robert H. Haas
Paul J. Torell
Affiliation:
University of Idaho Branch Experiment Station, Parma, Idaho
Robert H. Haas
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Twin Falls, Idaho Department of Range and Forestry, Agricultural and Mechanical College of Texas, College Station, Texas
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Abstract

Herbicidal control of tall larkspur, Delphinium occidentale Wats. was investigated in the Sawtooth National Forest near Oakley, Idaho. When larkspur was in a prebud stage, 4 and 8 lb/A of the propylene glycol butyl ether esters of 2-(2,4,5-trichlorophenoxy)propionic acid (silvex) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) gave good control, with significant increases in yield of native grasses. At the bud and flower stages neither herbicide gave satisfactory control at 12 lb/A. Granular silvex at 400 lb/A total product (80 lb/A ae) killed all larkspur with only slight injury to rabbitbrush, sagebrush, and native grasses. A chlorate-borate (25%–75%) mixture gave a complete larkspur kill at 1740 lb/A.

Type
Research Article
Information
Weeds , Volume 11 , Issue 1 , January 1963 , pp. 10 - 13
Copyright
Copyright © 1963 Weed Science Society of America 

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References

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