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scenario not currently available. Imazapic has both preemergent and postemergent activity which <br />is capable of controlling cheatgrass for several years. Many of the key species found in BME's <br />seed mix are known to be tolerant of imazapic. This tolerance is also variable between <br />preemergent and postemergent applications. Further experience and evaluation of its effects on <br />the vegetation and seedling establishment will be needed as some of the desired species are not <br />listed on the product label. <br />Scenario example #2: Avery dense stand of Russian thistle seedlings (1 to 2 inches in height) <br />are observed on a reclaimed site in its second year of growth. Desirable plants include the <br />normal grasses plus alfalfa, milkvetch, and several shrub species. <br />Dense stands of Russian thistle will out-compete the relatively young perennial seedlings for <br />moisture and nutrients. While some of the more aggressive perennial grasses would be expected <br />to persist with this competition the stand diversity and vigor would most likely suffer. The <br />objective to using herbicides in this situation is to preserve the desirable forts and shrubs while <br />controlling the Russian thistle. <br />A minimal dose of 2,4-D can be used in this situation. The key is to have the application rate <br />sufficient to control the Russian thistle but not adversely impact the desirable forts and shrubs. <br />Seedlings are generally most susceptible to herbicides when they are very young. Thus, timing is <br />critical and waiting until the thistle seedlings are even one or two inches taller may cause <br />.: unsatisfactory results at very light application rates. <br />Similar strategies may be available for other weeds such as blue or tumble mustard. However, <br />consideration should then be given to using Telar or Escort instead of 2,4-D due to the known <br />sensitivity of mustards to these products. <br />MR131 (5/2006) V-69 <br />