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Page 3 of 23 <br />Appendix 1 <br />first treatment. With either treatment, monitor infestations. Retreat with 1 quart/A of Tordon when shoot <br />control is less than 75 percent. <br />Tordon may be tank-mixed with 2,4D to provide adequate control. Apply 1 to I.5 pints of Tordon with 1 <br />to 1.5 quarts/A of 2,4D in spring when leafy spurge flowers. When this application is made for three to <br />five consecutive years, leafy spurge shoot control is generally 80 to 90 percent and cattle will feed in the <br />area again. <br />BanvelNanquish/Clarity also is effective against leafy spurge. Apply 2 quarts/A in spring for three <br />consecutive years. Often control is not very good in the first year but improves over the next two years. At <br />that time, a maintenance schedule that uses low rates of BanvelNanquish/Clarity + 2,4D (4 to 8 ounces + <br />0.5 to 1 quart/A), or Tordon + 2,4D (1 pint + 1 quart/A) as needed can be used to keep infestations under <br />control. Note: Avoid using soil-active herbicides such as 'fordon or Vanquish/Clarity near windbreak <br />plants or other desirable woody vegetation. Plant injury or death can occur. Also, do not allow any <br />herbicide to drift onto desirable woody vegetation for the same reasons. <br />Recently, Plateau (imazapic) was registered to control leafy spurge in noncrop areas. It can be used safely <br />around trees but may temporarily injure cool-season perennial grasses. Apply Plateau at 8 or 12 fl. ozlA in <br />fall, followed by 4 fl. oz/A the following spring at flowering. Add a methylated seed oil at 2 pints/A to the <br />spray solution. A liquid nitrogen fertilizer solurion may be added to the spray mixture to increase weed <br />control, but it may increase cool-season perennial grass injury. <br />Canada thistle <br />• <br />'~L~~~ _ <br /> <br />~ ,~ <br />,' ~ .. i ,, <br />,era ,~~=- ~~~i4°~ +.x« <br />~, <br />i~:'X ` <br />~~~y,~yw s ~ '`~ <br />` <br />+ ~' JKi :2~ ~ ~ ~~ <br />~ t~ <br />~~ <br />. <br />±~ <br />s <br />y ` <br />r <br /> <br /> <br /> <br />.' ~ tip,, . <br />_~_ ~ ~ ~ ~~,,~.y ...-- „ <br />; ,. •t <br /> <br />r <br />~ . <br />b i - , <br />a., <br />~ ti r" . ,~, t t ..M~. ~ ,, <br />y~• X . .. T-.r ~ r .. <br />~ ~ •: <br />~ ~. <br />,?~ ~ •~,~ <br />~~~~< <br />.,k ~'° <br />+y~ ,~'~~ °t' ,e it <br />Management <br />The key principle to Canada thistle control is to stress the plant and force it to use stored root nutrients <br />Canada thistle can recover from almost any stress, including control attempts, because of root nutrient <br />