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2019 Keeling Pit Noxious Weed Management Plan <br /> By the Huerfano County Noxious Weed Department <br /> 2. LEAFY SPURGE <br /> Beginning in the fall of 2019 (September-October), a chemical application of Imazapic <br /> and a non-ionic surfactant will be applied to the areas where leafy spurge is detected. A <br /> follow-up treatment in the spring of 2020 (April-June) will be needed to prevent further <br /> growth utilizing the same active ingredient and surfactant. Please refer to the <br /> Herbicide Application Rate section. Mechanical control efforts will be ineffective given <br /> the aggressive rhizomatous root system of leafy spurge and its widespread distribution <br /> throughout the site. Total treated acres will be documented during each application <br /> and follow up site monitoring will map the reduction of total infested acres to track the <br /> progress of control efforts. <br /> 3. SCOTCH THISTLE <br /> Given the limited amount of Scotch thistle found within the mine area,the digging and <br /> removal of these plants will be an adequate control measure. This control measure <br /> should be applied prior to seed set to avoid the spread of viable seed. The site should <br /> be monitored for regrowth as Scotch thistle has a considerably long seed life of nearly <br /> 40 years and regrowth is nearly certain. Given the location of the Scotch thistle within <br /> the mine area, routine site operations will most likely result in the removal of this <br /> population and seed contained within the soil. <br /> 4. VARIOUS "C LIST" SPECIES <br /> The mine area will be monitored for the growth of the various C list species found on <br /> site and control efforts will be taken as aesthetic thresholds are breached. Even though <br /> the various C list species found throughout the mine area will not be the primary target <br /> for treatment, the large amount of herbicide applied to treat the primary target species <br /> (hoary cress, leafy spurge) will aid in the containment and suppression of these species <br /> given that they are found in the same areas. Cheat grass is the C list species of greatest <br /> concern within the mine area. The active ingredient recommended for leafy spurge <br /> (Imazapic) will be used to treat areas where cheat grass is found. <br /> D. HERBICIDE USE CONSIDERATIONS AND REVEGETATION <br /> Damage to non-target desirable species is certain being that they are intermixed with <br /> the primary target species. Native plant species have varying degrees of tolerance for <br /> the herbicides recommended in this cycle. Treatment sites that exhibit high degrees of <br /> desirable plant loss will need to be reseeded with the recommended reclamation seed <br />