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INTEROFFICE MEMORANDUM <br />TO: EDNA MINE FINE, 198 1, SL11 <br />FROM: JANET BINN <br />SUBJECT: CONSUL TION TH R UTT UNTY WEED DEPARTMENT <br />DATE: 8/31/2009 <br />CG [CLICK HERE AND TYPE NAME] <br />On August 31, 2009, Greg Brown, Routt County Weed Manager, returned my call regarding uptake action of <br />Milestone ® herbicide. I had initiated a call to the Routt Count Weed Department on 8/28/2009, to inquire the <br />mode of action of Milestone ® herbicide on Canada thistle (Cirsium arvense). We had observed Canada thistle <br />at the Edna mine 2 weeks after the operator reported that the weeds had been sprayed with Milestone® <br />herbicide (sprayed 8/9/2009, observed 8/24/2009). The patches of Canada thistle along the LOM access road <br />on the east side of the Moffat area appeared healthy and did not show signs of epistasis or nodding flower <br />heads. Although I had looked up information regarding Milestone® on the Dow website (www.dowagro.com), <br />it was not clear how quickly a visual result of chemical uptake was expected. <br />Mr. Brown provided additional information regarding Milestone's® herbicide action. He informed me that <br />Milestone® is the preferred chemical for Canada thistle control. Some weed applicators mix Telar ® or Escort <br />® with Milestone S. Recommended times for spraying are when plant is young in the spring, up until bud <br />stage. Spraying at this time improves chemical uptake and translocation. But it is acceptable to spray even <br />when thistle is in flower, but once thistle has flowered the chemical will not be effective in killing the current <br />year's seed crop. If there is adequate moisture and the plant has not dried up yet, the chemical may still be <br />taken up and affect the roots. Routt County Weed Department recommends application of herbicide <br />(Milestone® preferred) in September, when additional soil moisture and cooler temperatures often result in a <br />second growth of the thistles. <br />Spraying the plants even at flowering stage will stress the root stores, and a second spraying in September <br />should provide additional mortality to these noxious weeds. Visually ou might not observe a1a# result for <br />several weeks after spraying, and then the plants will just die. Mileston ends to take a little bit longer before <br />you see a visual result. Routt County Weed Department recommends a heavy rate of 7oz/acres for Canada <br />thistle.