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controls (tillage, mowing, burning, cutting/pulling), chemical controls (selective herbicides), biological controls (weed - <br />specific insects or pathogens), or combinations of these methods. In general, treatment method(s) will be selected to <br />.achieve the most effective control with the resources available. As an example, where multiple weed species are <br />present, the most effective overall control(s) will be applied, although the method(s) may not be optimal for each <br />individual species. <br />Scheduling of weed management treatments will also be based on the CSU Extension Service recommendations for <br />specific weed species. For most species, control effectiveness can be significant enhanced by scheduling treatment at <br />specific stages of vegetative growth (typically spring and/or fall). To the extent possible, based on staff and contractor <br />availability, treatment will be scheduled to optimize effectiveness. <br />Priority and responsibilities for weed control are determined based on weed species present and the location and extent <br />of weed infestations. Certain weed species are extremely aggressive, and first priority will be given to their control to <br />prevent establishment and spread. Previously treated areas are second in priority, in order to maximize control <br />effectiveness. Third in priority are any new weed infestations and areas where the weed infestation covers a large area, <br />to prevent further spread. Lowest priority is given to isolated weed infestations of non - aggressive species which have <br />not been previously treated, since these may be addressed by natural vegetative succession and pose a reduced risk of <br />spread. Generally, grazing lessees are responsible for weed control on their lease areas, with TCC sharing control costs <br />and providing oversight, under the terms of the lease agreements. TCC is responsible for weed control on remaining <br />areas. All weed management activities (both TCC and grazing lessee) follow the general priorities, as outlined above. <br />Application of selected control method(s) <br />The following summarizes TCC's current treatment methods for listed noxious weed species. In addition, our grazing <br />lessees utilize aerial spraying for larger weed infestations in areas with limited access. If treatment extends over a <br />longer time period, or if control effectiveness is determined to be lower than anticipated, treatment methods or <br />• chemicals may be adjusted to improve long -term effectiveness. <br />Leafy spurge — Not present <br />Canadian, musk, and Scotch thistle — Cutting /pulling prior to formation of seed -heads and then fall spraying <br />with mix of Tordon, 2,4 -D amine, and Activator 90 (Banvel and Curtail are alternative chemicals) <br />Plumeless thistle — Not present <br />Perennial Sow thistle — Not present <br />Russian knapweed — Spring spot spraying with mix of Tordon, 2,4 -D amine, and Activator 90 (Curtail is <br />alternative chemical) <br />Spotted knapweed — Not present <br />Diffuse knapweed — Not present <br />Yellow toad flax (aggressive) — Spring spot spraying with Tordon (Banvel is alternative chemical) <br />Dalmation toad flax — Not present <br />Hoary cress (white top) — Spring spraying (full coverage and spot) with mix of Escort, 2,4 -D amine, and <br />Activator 90 (Plateau is alternative chemical), also addresses houndstongue <br />• Field bindweed — Not present <br />RNOS -05 2.05 -114.2 03/12/10 <br />