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Leafy Spurge (Euphorbia esula) Response to Single and Repetitive Picloram Treatments

Published online by Cambridge University Press:  12 June 2017

David G. Hein  and
Stephen D. Miller
David G. Hein
Affiliation:
Billings Institute of Religion, Billings, MT 59101
Stephen D. Miller
Affiliation:
P.O. Box 3354, University of Wyoming, Laramie, WY 82071
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Abstract

A 4-yr field study was conducted near Grassrange, MT to determine the effects of single and repetitive picloram treatments for leafy spurge control in a native pasture. Single applications of picloram at 0.28, 0.56, 0.84, and 1.12 kg ae ha–1 averaged 0, 5, 22, and 61% leafy spurge shoot control 3 yr after treatment. Only the single applications of picloram at 1.68 and 2.24 kg ha–1 maintained leafy spurge control above 80%. A retreatment with 0.56 kg ha–1 picloram was required to maintain effective control for 3 yr when less than 1.68 kg ha–1 was applied. Leafy spurge canopy cover in the 1.68 and 2.24 kg ha–1 treatments averaged 14 and 6% 3 yr after treatment; however, all other single applications required retreatment.

Keywords

Picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid, leafy spurge, Euphorbia esula L., ♯ EPHESNative grassesshoot densitycanopy coverrangeland
Type
Note
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 881 - 883
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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