 There are pretty big differences between Minnesota and Kentucky's forest ecosystems. For example, it seems that oak wilt is not a major issue for the oak forest of the central hardwood region. This may be due to the greater diversity of hardwood species, which may limit the spread of oak wilt between individual oak trees. In Minnesota, oak makes up about 10% of our forest, and oak wilt spreads relatively quickly between red oak species, especially on sites with sandy soil.