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The Bristly Thistle and Its Control

Published online by Cambridge University Press:  12 June 2017

D. E. Davis ,
H. H. Funderburk Jr.  and
D. R. Roberts
D. E. Davis
Affiliation:
Botany and Plant Pathology Department, Auburn University Agricultural Experiment Station, Auburn, Alabama
H. H. Funderburk Jr.
Affiliation:
Botany and Plant Pathology Department, Auburn University Agricultural Experiment Station, Auburn, Alabama
D. R. Roberts
Affiliation:
Botany and Plant Pathology Department, Auburn University Agricultural Experiment Station, Auburn, Alabama
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Abstract

Bristly thistle (Cirsium horridulum Michx.) is an important perennial weed in Alabama pastures. It may remain vegetative many years before flowering and may regrow from the roots after flowering. A heavily infested pasture produced about 10,000 seedlings per acre per year of which 73% established from January through April. There was an average of 150 achenes per head but many did not contain fully developed seed. Essentially equal numbers of red and yellow flowered types were found. From two to as many as six successive cuttings below the soil surface were necessary to kill thistle plants. Thistles were effectively controlled by 2,4-dichlorophenoxyacetic acid (2,4-D), and 2-methyl-4-chlorophenoxyacetic acid (MCPA).

Type
Research Article
Information
Weeds , Volume 12 , Issue 1 , January 1964 , pp. 22 - 25
Copyright
Copyright © 1964 Weed Science Society of America 

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References

Literature Cited

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