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control methods and practices will be timely applied to maximize their effectiveness <br />in preventing vegetation development or seed production. <br />Annual weedy species may be readily controlled with mowing or physical removal. <br />Perennial species such as Cirsium, have extensive root systems with significant <br />carbohydrate reserves. For such weed species mowing may only control seed <br />production without seriously affecting the plants survival. Disking or tilling areas <br />containing Cirsium or other noxious species may even increase the area of <br />infestation due to root sprouting. <br />1.3.3 Biological Control <br />Biological control of noxious and pest weeds can be an effective tool to physically <br />disrupt plant growth and seed development. GCC may use a combination of <br />biological methods including grazing by livestock (sheep, goats or cattle), insect <br />weed predators and plant diseases. Biological weed control methods and practices <br />will be timely applied to maximize their effectiveness in preventing seed <br />production. <br />The Colorado Department of Agriculture's Biological Weed Control Program has <br />on-going biological control programs for thirteen noxious or pest weed species. A <br />list of weed predator species and weed species controlled by these insects is <br />contained in APPENDIX D. <br />1.3.4 Chemical Control <br />Chemical control of noxious and pest weeds can be an effective tool to disrupt plant <br />growth and seed development. Chemical weed control methods and practices will <br />be timely applied to maximize their effectiveness in preventing seed production or <br />GCC Red Rocks Mine 7 03/03/03 <br />