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4 MONITORING AND FOLLOW-UP <br />Effective weed management takes several seasons to eradicate or bring weed populations to an <br />acceptable level. With well-established infestations it is likely that a seed bank has developed in the <br />soil capable of producing new plants for several years. An infestation of weeds can easily re-invade <br />treated azeas in one growing season if control and treatment activities are prematurely curtailed. P&M <br />will ensure that weed management efforts are carried out over an adequate number of growing <br />seasons to realize effective weed management within the permit area. <br />As with all weed management, this multi-season effort is best served by effective documentation of <br />control efforts and continued vigilance in successive seasons of management. It is highly important <br />to continue to conduct an annual survey of the permit area and monitor populations under treatment to <br />determine the effectiveness of control methods and need for continued efforts. Information gathered <br />can be used to modify treatment priorities and weed management strategies over time. Ongoing <br />surveys are also necessary to continually looked For new infestations that may be moving into the site. <br />These new sources of infestation may be worked into prevention and management plans as necessary. <br />The Edna Mine weed management plan will be modified over time as site conditions change. Weed <br />management strategies and priorities can be modified as weed infestations change in response to <br />continued control efforts. <br />5 <br />Beck, K.G., S.K. McDonald, S.J. Nissen, and P.H. Westra. 1998. 1998 Colorado <br />Weed Management Guide for Field and Vegetable Crops. Colorado State University Cooperative <br />Extension, Publication #XCM-ZOS, Fort Collins, CO. <br />Bussan, A.J., T.D. Whitson, S.A. Dewey, and M.A. Trainor. 2001. Weed Management Handbook: <br />2001-2002. Cooperative Extension Services of Montana, Utah, and Wyoming <br />Thornton, Bruce J., H.D. Harrington, and R.L. Zimdahl. 1974. Weeds of Colorado. Colorado State <br />University Experiment Station, Bulletin 514-5. Fort Collins, CO. <br />Whitson, Tom D., ed. Weeds of the West. 9~' Edition. 2001. The Western Society of Weed Science, <br />Westem United States Land Grant Universities Cooperative Extension Services, Newark, CA. <br />P&M Edna Mine I~ 02/24/06 <br />