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are any new weed infestations and areas where the weed infestation covers a large area, to <br />prevent further spread. Lowest priority is given to isolated weed infestations of non - aggressive <br />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 the proposed treatment <br />methods for listed noxious weed species known to occur within the PSCM permit area. If <br />treatment extends over a longer time period, or if control effectiveness is determined to be lower <br />than anticipated, treatment methods or chemicals may be adjusted to improve long -term <br />effectiveness. Approved or more effective chemicals for targeted weeds may change over time <br />and these modifications will be incorporated as needed. <br />Routt County Noxious Weed list: <br />• Yellow toadflax/butter and eggs - Spring spot spraying with Tordon (Banvel is alternative <br />chemical) <br />• Houndstongue - Spring spraying (full coverage and spot) with mix of Escort, 2,4 -D amine, and <br />Activator 90 (Plateau is alternative chemical) <br />Colorado State Noxious Weed A and B lists: <br />• Bull thistle - Cutting/pulling prior to formation of seed -heads and then fall spraying with mix <br />of Tordon, 2,4 -D amine, and Activator 90 (Banvel and Curtail are alternative chemicals) <br />• Musk thistle - Cutting/pulling prior to formation of seed -heads and then fall spraying with mix <br />of Tordon, 2,4 -D amine, and Activator 90 (Banvel and Curtail are alternative chemicals) - <br />• Canada thistle - Cutting/pulling prior to formation of seed -heads and then fall spraying with <br />mix of Tordon, 2,4 -D amine, and Activator 90 (Banvel and Curtail are alternative chemicals) <br />• Hoary cress (white top) - Spring spraying (full coverage and spot) with mix of Escort, 2,4 -D <br />amine, and Activator 90 (Plateau is alternative chemical), <br />For large areas or significant weed infestations, PSCM may utilize a weed - control contractor to <br />achieve overall control and then utilize in -house resources (Environmental Staff, student interns, <br />summer students, contract labor) for ongoing maintenance control activities. PSCM will maintain <br />an ATV with spray -tank, spray bar, and hand - sprayer, as well as several backpack tank sprayers <br />for weed control. Chemical control activities are overseen by a U.S. -EPA Certified Pesticide <br />Applicator and pesticide storage, handling, and use procedures and personal protective equipment <br />are utilized to prevent potentially hazardous personal or environmental exposures. Where control <br />of extensive weed infestations results in limited vegetative cover or bare - ground, the affected area <br />will either be inter- seeded or ripped and seeded, dependent on site - specific conditions. <br />Evaluation of Control Effectiveness - Generally, in conjunction with the spring Environmental <br />Management surveys, areas of previously identified and treated noxious weed infestations are <br />6 01/2011 <br />