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the extent possible, based on staff and contractor availability, treatment will be scheduled to optimize <br />• effectiveness. <br />3) Priority for weed control are determined based on weed species present and the location and extent of weed <br />infestations. Certain weed species are extremely aggressive, and first priority will be given to their control <br />to prevent establishment and spread. Previously treated areas are second in priority, in order to maximize <br />control effectiveness. Third in priority are any new weed infestations and areas where the weed infestation <br />covers a large area, to prevent further spread. Lowest priority is given to isolated weed infestations of non- <br />aggressive species which have not been previously treated, since these may be addressed by natural <br />vegetative succession and pose a reduced risk of spread. <br />Application of selected control method(sl -The following summarizes BTU EC's current treatment methods for <br />listed noxious weed species. In addition, our grazing lessees utilize aerial spraying for larger weed infestations in <br />areas with limited access. If treatment extends over a longer time period, or if control effectiveness is determined <br />to be lower than anticipated, treatment methods or 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 <br />spraying with mix of Tordon, 2,4-D amine, and Activator 90 (Banvel and Curtail are alternative <br />chemicals) <br />Plumeless thistle -Not present <br />Perermial Sow thistle -Not present <br />. Russian knapweed -Spring spot spraying with mix of Tordon, 2,4-D amine, and Activator 90 (Curtail is <br />altemative chemical) <br />Spotted knapweed -Not present <br />Diffuse knapweed -Not present <br />Yellow toad flax (aggressive) -Spring spot spraying with Tordon (Banvel is altemative 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 altemative chemical), also addresses houndstongue <br />Field bindweed -Not present <br />Salt cedar (tamarisk) -Hand-cutting the main stems and immediate application of triclopyr systemic <br />herbicide, for any lazger infestations tamarisk leaf beetles or aerial spraying may be utilized <br />Russian olive -Newly-listed species, occurrence to be determined through field reconnaissance <br />For large areas or significant weed infestations, BTU EC may utilize aweed-control contractor to achieve overall <br />control (typically over several years) and then utilize in-house resources (Environmental Staff, student interns, <br />summer students, contract labor) for ongoing maintenance control activities. BTU EC maintains an ATV with <br />• spray-tank, spray bar, and hand-sprayer, as well as several backpack tank sprayers for weed control Chemical <br />control activities are overseen by a U.S.-EPA Certified Pesticide Applicator and pesticide storage, handling, and <br />use procedures and personal protective equipment are utilized to prevent potentially hazazdous personal or <br />MR06-47 2.05-32b 04/18/06 <br />