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report includes suggested species for reintroducing into forests, savannas, and prairie areas found <br />within the Roseville Parks studied. <br />CONTROL INVASIVE EXOTIC SPECIES <br />Nonnative species (sometimes called "exotics ") have become prominent in many of the parks in <br />Roseville. Some of these include European buckthorn, glossy buckthorn, Tartarian <br />honeysuckle, spotted knapweed, Chinese elm, reed canary grass, smooth brome, Kentucky <br />bluegrass and leafy spurge. These plants often invade native plant communities and can take <br />over rapidly, eliminating native species and causing a loss of plant diversity and wildlife habitat. <br />To control invasion by exotics, minimize disturbance to natural areas and surrounding buffer <br />areas as much as possible, and avoid planting exotics or providing openings for them to invade. <br />Regular inspections of natural areas can help identify new infestations early, keeping <br />management cost low and preventing the spread of these plants to the point where an <br />unnecessary amount of resources must be dedicated to their control. <br />PURPLE LOOSESTRIFE <br />Roseville has already released some biocontrol agents for purple loosestrife, and a recent survey <br />by the county Agricultural inspector found that the beetle has already colonized most of the <br />metro area wetlands. Luke Skinner with MN DNR Ecological Services recommends that <br />loosestrife- infested wetlands in Roseville be monitored to determine if beetles are already <br />present, and to note what impacts they are having, if any. He made several additional points <br />regarding Roseville: <br />Harriet Alexander Nature Center in Central Park has had marginal success with loosestrife <br />control in the last three to four years since release, but it can take up to 6 or 7 years for the <br />beetles to fully establish. Since it can take a substantial amount of time for these beetles to <br />establish, it is prudent to adopt a "wait and see" attitude regarding these populations. <br />If the beetles have already colonized other loosestrife- infested wetlands and their population is <br />quite low, it may be useful to implement a beetle- rearing and reintroduction program to <br />supplement the existing population. Alternately, it may be adequate to monitor the existing <br />City of Roseville 23 <br />Parks Natural Resource Management <br />