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the extent possible, based on staff and contractor availability, treatment =Till 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(s) — 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 alteriiative <br />chemicals) <br />Plumeless thistle — Not present <br />Perennial Sow thistle — Not present <br />Russian knapweed — Spring spot spraying with inix of Tordon, 2,4 -D amine, and Activator 90 (Curtail is <br />alternative chemical) <br />Spotted k- napweed — 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 />Salt cedar (tamarisk) — Hand- cutting the main stems and immediate application of triclopyr systemic <br />herbicide, for any larger 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 a weed - control contractor- to achieve overall <br />control (typically over several years) and then utilize in -house resources (Envirorunental_ 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 )-geed control. Chemical <br />control activities are overseen by a U.S. -EPA Certified Pesticide Applicator and pesticide storaore. handling; anci <br />use - orc,cedures and personal protective equipment are utilized to prevent 'Dazarldous ers na e`- <br />