2008-01-08_PERMIT FILE - M2008001 (28)

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Page 3 of 23 Appendix 1 first treatment. With either treatment, monitor infestations. Retreat with l quart/A of Tordon when shoot control is less than 75 percent. Tordon may be tank-mixed with 2,4-D to provide adequate control. Apply I to 1 5 pints of Tordon with 1 to 1 5 quarts/A of 2,4-D in spring when leafy spurge flowers. When this application is made for three to five consecutive years, leafy spurge shoot control is generally 80 to 90 percent and cattle will teed in the area again. Barrel/Vanquish/Clarity also is effective against leafy spurge. Apply 2 quarts/A in spring for three consecutive years. Uften control is not very good in the first year but improves over the next hvo years. At that time, a maintenance schedule that uses low rates of Bam•el/Vanyuish/Clarity ~ 2,4-U (4 to 8 ounces + OS to l quart/A1. or Tordon ~ 2,4-D (l pint + I quart/A) as needed can be used to keep infestations under control. Note: Avoid using soil-active herbicides such as "Cordon or Vanquish/Clarity near windhreak plants or other desirable woody vegetation. Plant injury or death can occur. Also, do not allow" any herbicide to drift onto desirable woody vegetation for the same reasons. Recently, Plateau (imazapic) was registered to control leafy spurge in noncrop areas It can be used safely around trees but may temporarily injure cool-season perennial grasses. Apply Plateau at 8 or 12 tl oz/A in tall, followed by 4 tl oz/A the following spring at flowering Add a methylated seed oil at 2 pints/A to the spray solution. A liquid nitrogen fertilizer solution may he added to the spray mixture to increase weed control, but it may increase cool-season perennial grass injury. Canada thistle ManaKement The key principle to Canada thistle control is to stress the plant and force it to use stored root nutrients Canada thistle can recover from almost any stress, including control attempts, because of root nutrient