David Cappaert, Michigan State University
The Minnesota Department of Agriculture (MDA) has placed a quarantine on ash trees in Ramsey, Hennepin and Houston counties. Emerald Ash Borers (EAB) have been found in ash trees in Houston and Ramsey Counties.
Quarantine means a person cannot transport any part of an ash tree, including lumber, seedlings, mulch or firewood, outside of the county without permission from the MDA. If you are going camping, don’t take firewood. Instead, purchase firewood where you are camping and leave any wood you don’t burn.
EABs attack and kill ash trees. The larvae are worm-like grubs that kill the trees by tunneling under the tree's bark. Adults are small, iridescent green beetles that live outside of trees during the summer months. All ash trees are susceptible to EAB.
Minnesota has one of the highest volumes of ash on forestland in the United States. Roseville estimates that about 25% of trees in the city are Ash trees. The spread of EAB could have a devastating effect on Minnesota’s economy.
You may be approached by a firm wanting to trim or remove your ash tree. Tree removal companies
must be licensed by the City of Roseville. The cost of removing and replacing a single tree can range from hundreds to thousands of dollars. If a company offers to apply a preventative treatment to your tree, the annual cost of treatment should be in the $50-100 range and the company must have a commercial pesticide applicator license. Ask any contractor to show you their license(s).
Ash wood can be taken to free Ramsey County yard waste sites. Wood dropped off there is chipped and shipped to District Energy where it is burned to generate heating or cooling for downtown St. Paul. Ash wood mulch is safe to use in your yard if pieces are no greater than 1” on more than one side.