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Western Whorled Milkweed and its Control

Published online by Cambridge University Press:  12 June 2017

M. K. McCarty  and
C. J. Scifres
M. K. McCarty
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Lincoln, Nebraska
C. J. Scifres
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Lincoln, Nebraska
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Abstract

A poisonous pasture weed, western whorled milkweed [Asclepias subverticillata (Gray) Vail] is capable of spreading in a few years from scattered clumps, highly variable in number of stems, to an almost solid, uniform stand. The most effective herbicide evaluated for its control was 4-amino-3,5,6-trichloropicolinic acid (picloram). Use of 2-methoxy-3,6-dichlorobenzoic acid (dicamba) gave only fair control. The herbicides 2,4-dichlorophenoxyacetic acid (2,4-D), 2,4–5-trichlorophenoxyacetic acid (2,4,5-T), 2-(2,4,5-trichlorophenoxy)propionic acid (silvex), and 3-amino-l, 2,4-triazole (amitrole) were ineffective. The addition of amitrole did not enhance the effectiveness of dicamba or picloram for control of this species.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 1 , January 1968 , pp. 4 - 7
Copyright
Copyright © 1968 Weed Science Society of America 

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References

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