MWCA Library » Russian Knapweed http://www.mtweed.org/library To Strenthen, support, and coordinate weed management efforts in Montana. Mon, 06 Feb 2012 17:30:00 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 Many Kinds of Knapweed Found in Montana http://www.mtweed.org/library/index.php/many-kinds-of-knapweed-found-in-montana/ http://www.mtweed.org/library/index.php/many-kinds-of-knapweed-found-in-montana/#comments Fri, 02 Sep 2011 22:08:58 +0000 MWCA http://www.mtweed.org/library/?p=1471 The September MSU monthly weed post focuses on knapweeds.  Did you know that there are eight kinds of knapweed found in Montana?   Dr. Jane Mangold’s publication this month takes the flower of each of the knapweeds and teaches us how to tell the difference.

Download this two page publication today.   Learn how to tell spotted knapweed from brown knapweed.

MWCA has pages devoted to identification of the knapweeds  listed on the Montana Noxious Weed list:  Russian Knapweed, Spotted Knapweed, Diffuse Knapweed and Yellow Starthistle.

]]> http://www.mtweed.org/library/index.php/many-kinds-of-knapweed-found-in-montana/feed/ 0 Impact of Knapweed on MT Economy http://www.mtweed.org/library/index.php/impact-of-knapweed-on-mt-economy/ http://www.mtweed.org/library/index.php/impact-of-knapweed-on-mt-economy/#comments Tue, 23 Jul 1996 19:10:17 +0000 MWCA http://www.mtweed.org/library/?p=195 Steven A Hirsch and Jay A Leitch

The economic impact of thee invasive, exotic weeds–diffuse, spotted, and Russian knapweed (Centaurea diffusa, C. maculosa, and Acroptilon repens)–on Montana’s economy was estimated using a procedure developed for another invasive weed species. Published data and that from a survey of county weed boards were used to estimate direct negative impacts of over $14 million annually due to infestation of over 2 million acres of rangeland and wildland. This amounts to about $10.63 on each infested grazing land acrea nd $3.95 on each infested wildland acre. Direct plus secondary economic impacts, estimated using an input-output model, are about $42 million annually,, which could support over 500 jobs in the state’s economy. This first approximation suggests the knapweed infestation problem in Montana deserves attention, although more work could be done to refine these estimates and to allow estimation of he impacts at sub-state levels.

Link to Full Article

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