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Page 3 of 23 <br />Appendix <br />first treatment. With either treatment. monitor infestations. Retreat with I quart )'A of Tordon when shoot <br />control is less Ihan 75 percent. <br />Tordon may be tank-mixed with 2,4-U to provide. adequate control. Apply I to 1.5 pints of Tordon with I <br />to I.> quarls, A of 2.4-13 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. Offen 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 Banvel, Vanquish Clanty t 2.4-1) (4 to `t ounces i <br />0.5 to I quaruA), or Tordon 2,44) (1 pint i I quart. A) as needed can he used to keep infestations under <br />control. Note: Avoid using soil-active herbicides such as Tordon or VanquishXlarity 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 ?N oodv t ct etanon for the same reasons. <br />Recently, Plateau (imazapic) was registered to control Icafy spurge in noncrop areas. It can he used safely <br />around trees but may temporarily injure coin-season perennial grasses. Apply Plateau at R or 12 fl. ozlA in <br />tall, followed by 4 tl. 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 be added to the spray mixture to increase weed <br />control, but it may increase cool-season perennial grass injury <br />Canada thistle <br />?1 - K y {3R <br />Rol <br />'4' 7 <br />' Z • R? <br />ti 4 ?? ?.?` . 5++x`1 ?s .'dML? <br />lit <br />k,? x ? 4 • ? ?. its.. ,f?.r~ ' <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 fi-orn almost any stress, including control attempts, because of root nutrient