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9. Tamarisk <br />A. Mechanical and Cultural Control — Many mechanical controls, when used on their <br />own, have little or no effect. These methods include burning, shredding, roller <br />chopping, and chaining. Repeated root plowing with a horizontal blade at least 20 <br />inches below the soil surface coupled with revegetation, has proven effective. <br />However, this is expensive and not realistic for smaller infestations. <br />B. Mechanical and Chemical Control — Flooding is only effective if the plant is totally <br />submerged for at least 24 months. Cutting trees at the base and immediately applying <br />herbicide to the cut stump is effective. <br />C. Chemical Control Only — In general, effective chemical control requires multiple <br />applications. Timing and application rate are crucial for successful control. <br />Herbicides containing triclopyr, imazapyr, or imazapyr mixed with glyphosate <br />effectively control tamarisk. Triclopyr can be applied in May or August and imazapyr <br />can be applied in August or September. <br />10. Russian Olive <br />A. Mechanical and Chemical Control — Control is difficult once trees are mature. <br />Mature trees should be cut down to the ground level and an appropriate herbicide (i.e. <br />glyphosate or triclopyr) should be applied. Ideally, control should occur before <br />fruiting to prevent the spread of seeds. <br />B. Mechanical Control Only — Many mechanical controls, when used on their own, have <br />little or no effect. Cutting trees at the base and immediately applying herbicide to the <br />cut stump is effective. Trees smaller than 4 inches in diameter should be pulled out <br />with a weed - pulling tool when the ground is moist. <br />C. Chemical Control Only — In general, effective chemical control requires multiple <br />applications. Effective long -term control typically involves a combination of <br />treatments that include mechanical removal of top growth followed by chemical <br />treatment of stumps, sprouts, and saplings. Herbicides containing 2,4 -D + triclopyr, <br />imazapyr, and glyphosate effectively control Russian olive. <br />If they are deemed necessary, the Larimer County Weed Control District will be contacted for <br />chemical suggestions. If herbicides are used, a schedule for treatment and contact information on <br />the licensed applicator to be used will be kept on file by the operator. Cultural (revegetation) and <br />mechanical controls will begin as soon as practicable following site disturbances. <br />Conclusion <br />Weed management by cities and counties is becoming more common in Colorado and through <br />this type of management; undesirable plant species have been reduced. Not unlike other parcels <br />along the Front Range, this project has varying landscapes and existing site conditions. With this <br />in mind, this plan was formulated and by implementing one or more of the above applications, <br />weeds can be managed and reduced in the Timnath Connell Pit permit area. <br />Contact Information <br />Larry Johnson, Connell Resources, Inc. <br />7785 Highland Meadows Pky Ste. 100 <br />Fort Collins, CO 80528 <br />4 <br />