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Page 3 of 23 Appendix I <br />first treatment. With either treatment, monitor infestations. Retreat with I quart'A of Tordon when shoot <br />control is less than 7> percent. <br />Tordon may be tank-mixed with 2,4-D to provide adequate control. Apply I to 1.5 pints of Tordon with l <br />to I.> quarts,'A of 2,a-D 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 />Banvel/Yanquish/C'larity 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 BanvclNanquish`Clan 1), 1 _4-D (4 to & ounces <br />0.5 to 1 quatt'A), or Tordon i 2,4-D (1 pint • 1 quart,A) as needed can be used to keep infestations under <br />control. Note: Avoid using soil-active herbicides such as Tordon or Vanquish/Clarity near ,vindbreak <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 safek <br />around trees but may temporarily injure cool-season perennial grasses. Apply Plateau at S or 1 fl. oz/A 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 solution may he added to the spray mixture to increase weed <br />control, but it may increase cool-season perennial grass injury. <br />Canada thistle <br />1? <br />Management <br />q <br />i <br />?= Y ,yQ. ? y,y R! y n ? • tt? ??? .-. ? ?? kc?r.?'? a tr. ?'? °?. <br />C p p;. J 4 ! k.rt. s r of .i <br />?4+(u l?' ?R ?ntWt:Jr J Jt, to ` ?.` .,T <br />i u <br />ri ?• ? - ??, ?.- -. ? TT?. 'I,? ? p Y%Tj, CAI E/ <br />.. ? V- <br />pr_ <br />.?? ,gar p•r !??9 ,? ,_°! c <br />Ord <br />is ? r.:??,yv>w: ?' . ? K??jc{?'jlt. `.?. '`?.• ' ? ?°'?I,?'? <br />The key principle to Canada thistle control is to stress the plant and fierce it to use stored root nutrients. <br />Canada thistle can recover front almost any stress, including control attempts, because of root nutrient