Laserfiche WebLink
controls (tillage, mowing, bunting, 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 />,rte 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 detemuned based on weed species present and the location and extent <br />of weed infestations. Certain weed species are extremely aggressive, and fast priority will be given to their wntrol to <br />prevent establishment and spread. Previously treated azeas aze second in priority, in order to maximize control <br />effectiveness. Third in priority are any new weed infestations and azeas where the weed infestation covers a large azea, <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 azeas, with TCC sharing control costs <br />and providing oversight, under the terms of the lease agreements. TCC is responsible for weed coutrot on remaining <br />azeas. All weed management activities (both TCC and grazing lessee) follow the general priorities, as outlined above. <br />Aoalication 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 ]azger weed infestations in azeas with limited access. If treatment extends over a <br />longer time period, or if control effectiveness is detemrined 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 aze 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 (aggessive) -Spring spot spraying with Tordon (Banvel is alternative chemical) <br />Dahnation 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 />MR06-206 2.05-114b 04/13/06 <br />