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CANADA THISTLE ,• <br /> <br />1 <br />,~,1 <br />E~ <br />.4 ... . <br />4 <br />thistle by the small <br />thistle have a tap <br />lished on the River <br />almost spineless lea <br />Seems to infest the <br />lard. Believed to <br />General Burgcyne's <br />south as California <br />at least 37 states. <br />Control <br />Description <br />Perennial, reproducing by creeping <br />rootstocks and seed. Stems 1 to 4 feet <br />high, erect, rigid, only slightly hairy. <br />Leaves oblong, very irregular and <br />deeply cut, spiny toothed on margins. <br />Leaves are a bright green and only <br />slightly hairy on undersurface. A <br />great deal of nonuniformity in leaf <br />characteristics, varying from a mass of <br />spines to virtually a spineless leaf. <br />Flowers are small, bristly clusters <br />varying in color from light lavender to <br />a bright rose purple. Two types of <br />flowers, mate and female, each being <br />located on separate plants. Only the <br />female flawers produce seed; hence it <br />is entirely possible for a patch of <br />thistle to bloom but not produce seed if <br />the patch is only male. This condition <br />root only). A Linn variety of Canada thistle has become estab- <br />be brought into the United States by way of Canada with hay for <br />5 ~~ ~ - may also account for the wide variation in <br />leaf appearance among thistle infestations <br />The seed is smooth and light to darlc brewi~..~ <br />L ;fj, curved or straight, banana-shaped, tipped <br />-~'z.,''~~`~ by atone-shaped point. A tuft of hairs <br />~~ ~rs .. loosely attached to the seed tip aids in disper- <br />~~,~ sal by wind, but not the great distances same <br />~ people think. Canada thistle is many times <br />`~ confused with many common pasture buff thistles, <br />but can be distinguished frcm pasture and hull <br />flower cluster and the extensive root system (pasture and bull <br />ton project a~~d differs from common Canada Lhistle by smooth, <br />ves. Canada thistle is one of the most feared weeds in the US. <br />most productive land, along stream banks and in irrigated crop <br />arry. Now ccmmon thro~ohout the northern half of the US as far <br />and Virginia. Canada thistle has been declared a noxious weed in <br />2, 4-D amine or ester, Tor9on ??K, Tordon ? 1? or Tnrdon 22K pellets, Banvel and <br />Roundup will all control Canada thistle. Rates and times of application will vary depen- <br />dent upon the material used. <br />19f.2 Chemical Cost: <br />h wide variation from atwut $1.50/acre to about 535/acre depending on material and <br />rate used, and v+hether you :vent cor•trol of seed I~roduction or eradication. <br />