Open Space Advisory Board Agenda and Packet 2010 10 13

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Control Options Most effective strategy is to maintain a healthy stand of perennial grasses either through reseeding or releasing existing grasses by controlling cheatgrass and other weeds Mechanical IIandpulling Effective only in small areas and must be repeated throughout the year for many years Mowing Will set seed below mower height Spreads seeds Control Options Prescribed Burn Can be effective if conducted at the right time in late fall or early spring Can fail if fire is not hot enough to kill seedlings. Can cause injury to desirable vegetation at fire temperatures needed Typically used for monoculture stands of cheatgrass Requires herbicide application and reseeding afterwards as seed already in the ground will not be destroyed Requires extensive planning and labor Control Options Plateau (Imazapic) 9.5-too %control Low rate -q -8 ounces /acre Caution label Short window of opportunity to spray Can cause extensive desirable plant injury if overlapped Matrix (rimsulfuron) Telar (chlorsulfuron) no-roo %control Low rate- Matrix@ z- 4 oz /ac *Teter@ o.5 War Caution labels Larger window of opportunity to spray than Plateau Potential for some injury to desirable perennial grasses and nativeforbs Biological No biological controls available Control Options Grazing typically sheep Suppresses seed production if intensive grazing conducted in early spring Expensive May injure desirable vegetation Control Options Chemical Excellentcontrol Cost effective Low toxicity and use rates May be necessary to reseed areas that do not have much desirablevegetation Potential injury to desirable vegetation Requires broadcast spraying 2010 LouisviIIe Open Space Targeted Cheatgrass Legend aaa Gbeatgrass Open Spate 2wMan. 10/5/2010 2