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Since 2004, the City of River Falls has been striving to improve diversity in our entire tree population. We cannot limit the tree species we plant to one, two, or even five species. The new guideline for tree diversity has a target goal of no more than 10 percent of any genus of trees in a tree population. Our approved boulevard tree list has many trees both native and non-native in an effort to make our urban forest more resilient from the next large scale pest or disease. We encourage homeowners to also find new non-invasive species that they can plant on their private property to help strengthen our forest diversity.
Currently the closest confirmed EAB sighting is near Lakeland, MN along I94. Adult EAB insects can only travel about ½ a mile on their own; however careless firewood movement of infected wood could bring EAB here at any time. That is why Wisconsin and Minnesota have firewood movement regulations and quarantines.
The City is currently in the process of having a few high value public Ash trees treated for EAB such as the Ash trees in the Main Street boulevard. However, it is too cost prohibitive to have all the public Ash trees treated on a biennial basis. It is better to remove those trees and replace with a non-Ash species that would not have to be treated.