Asiatic sand sedge, Carex kobomugi (Ck), was probably introduced to North America about a century ago when shipwrecks released plants used to pack Oriental porcelain. In New Jersey, the species expanded in area over 300% at Island Beach State Park (IBSP) and 800% at Sandy Hook Unit of Gateway National Park (SHU) between 1985 and 2002. From1999 – 2003, managers at IBSP sprayed the herbicide Roundup on three Ck beds. We monitored the effects on densities of both the invasive and native species in subsequent years.  A year after being sprayed three times, one bed showed a 90% decrease in ck abundance and slight increases in native species densities.  Ck densities declined further in the second year but by three years after cessation of spraying the species had increased 5X relative to the 2-year low values, but native species densities also increased over the same period. Another bed, sprayed only once, showed 70% decreases in Ck one year after spraying, a decrease that was sustained for the subsequent two years.  1 year post-spray, no change in native species densities was seen.  However native species densities did increase in the following years. In a third bed, sprayed several years after the first two, a 96% reduction in Ck abundances was observed several months after spray application.  However some plants were probably able to regenerate from belowground rhizomes, since densities had increased markedly by the following spring.  Again, spray application not only spared native plants at this site, but resulted in increased densities in these species over time.  While these data are interesting, they represent monitoring of a pre-established treatment program, rather than a controlled scientific experiment.   Thus, during the summer of 2004 an experiment was initiated at SHU in which 3 replicate 10 x 10 m plots were established for each of the following treatments (1) Covered by heavy tarpaulins (2) Removal of the top 6-8 inches of growth using a backhoe (3) Application of Roundup Herbicide.  A number of control plots were also created.  Before treatment commenced 10 replicate 1m² plots were selected at random and the densities of all of the species present were established, so that the effectiveness of these different treatment strategies can be compared in future years.