Laserfiche WebLink
Herbicide solutions were spot-applied to targeted weed species with an RTV-mounted <br />spray rig in easily accessible areas and backpack sprayers on more difficult terrain. An <br />herbicide solution of Weedestroy (active ingredient: 2,4-D amine) and Tordon 22K <br />(active ingredient: picloram) was applied to Canada thistle, musk thistle, oxeye daisy and <br />houndstongue. These herbicides are broadleaf selective and have a very low potential for <br />injury to surrounding desirable native grass species. A separate mixture of Milestone <br />(aminopyralid) and Escort (metsulfuron methyl) was used to treat whitetop infestations. <br />These herbicides are less selective than the mix used for thistle and houndstongue species <br />and are frequently used to combat whitetop with a high degree of success. A surfactant, <br />MSO Premium, was included in both herbicide mixtures to increase leaf adhesion and <br />absorption. Additionally, blue marker dye was included in both mixtures to allow greater <br />visibility of treated areas. Appendix A contains complete herbicide application records <br />for 2010, including dates, quantities, and dilution rates of all herbicides and surfactants. <br />Noxious Weed Locations <br />Treatment efforts in 2010 were focused in both the Moffat and West Ridge areas of the <br />mine. A map summarizing treatment areas, dates, and species has been included in this <br />document as Appendix B. <br />Moffat <br />Large dense patches of Canada thistle were treated in the Moffat area over the course of <br />both visits in 2010. During the June visits, many Canada thistle plants were treated as <br />very small rosettes. Prior to the July visit, rosettes and unsprouted plants became larger, <br />allowing for greater visibility and ease of treatment. The majority had not gone to seed as <br />of the July treatment. The most severe infestations were found in the northwestern section <br />of the Moffat area, adjacent to the pond and extending eastward several hundred yards <br />into the bottom sections of the three drainages that bisect the northern portion of the <br />Moffat area. The pasture/sagebrush areas directly south of the pond within the Moffat <br />area were found to have the highest density of Canada thistle. Small patches of oxeye <br />daisy were treated along the drainage in this area as well. The open hillsides directly to <br />the east of this field, across the road, were also found to have high densities of Canada <br />thistle. <br />2010 Edna Mine Weed Management Report 2 8/30/2010