Canada thistle


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Canada thistle:

see thistlethistle,
popular name for many spiny and usually weedy plants, but especially applied to members of the family Asteraceae (aster family) that have spiny leaves and often showy heads of purple, rose, white, or yellow flowers followed by thistledown seeds (a favorite food of the
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References in periodicals archive ?
The way or Canada thistle is often ignored and pathways are
those present before and after herbiciding including Canada thistle (Cirsium vulgare) and common burdock (Arcrium minus) by the further use of herbicides and prescribed burns.
Burn Wheat Plow Mow Species 1998 1999 1998 1999 1998 1999 1998 1999 Blue-joint 0 0 27 2 14 1 40 2 Canada thistle 0 0 2 2 0 3 10 4 Common ragweed 0 0 6 0 0 53 0 0 Lambs-quarters 0 0 0 19 0 56 0 4 Quack grass 4 8 29 15 76 49 63 83 Smooth brome 100 8 44 2 8 3 0 8 Velvet-leaf 0 0 0 0 0 56 0 0 Wild carrot 0 0 33 0 53 3 4 8 Control Species 1998 1999 Blue-joint 18 26 Canada thistle 35 18 Common ragweed 0 0 Lambs-quarters 0 3 Quack grass 60 65 Smooth brome 3 3 Velvet-leaf 0 0 Wild carrot 18 28 Cost ($/ha) of each prairie creation treatment in RLWRA, Clinton County, Michigan, between August 1998 and May 1999.
Under growth-chamber conditions, mite populations on a Canada thistle plant can reach very high levels, causing severe damage to the plant.
The Canada thistle does not have rootstocks like the quackgrass, but has true roots, the parts of which are capable of producing plants.
Among the dozens of plants that Plateau is labeled to control are such problem weeds as leafy spurge, Russian knapweed, Canada thistle, dalmatian toadflax, downy brome, cheatgrass and medusahead rye.
Another two items we labored over were common burdock roots and the roots of Canada thistle.
Northern Plains farmers face still another "worst weed" in Canada thistle.
Especially difficult weeds controlled with Roundup Ready corn system include: hemp dogbane, giant ragweed, johnsongrass, milkweed, sandbur, shattercane, swamp smartweed, Canada thistle, tall waterhemp, wild proso millet, wirestem muhly, woolly cupgrass and others.
I reclaimed a former sheep and goat lot this spring here at Carlson Farm for new garden space, and it was a major battle with quackgrass and Canada thistles.

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