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Distribution of Carduus nutans, C. acanthoides, C. pycnocephalus, and C. crispus, in the United States

Published online by Cambridge University Press:  12 June 2017

P. H. Dunn
P. H. Dunn*
Affiliation:
Biol. Control of Weeds Lab., Agric. Res. Serv., West. Reg., U.S. Dep. Agric, Albany, CA 94706
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Abstract

A survey determined the extent and severity of the infestations of four species of Carduus thistles in the United States. In the mainland United States, 360 counties of 3068 have economically important infestations of musk thistle (Carduus nutans L.), the Appalachian and midwest regions harboring the greatest infestations. Plumeless thistle (Carduus acanthoides L.) and Italian thistle (Carduus pycnocephalus L.) are of economic importance, but have limited distribution. Welted thistle (Carduus crispus L.) is approaching pest status only in Virginia.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 5 , September 1976 , pp. 518 - 524
Copyright
Copyright © 1976 by the Weed Science Society of America 

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References

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