Maplewood News

Posted on: June 29, 2017

Emerald Ash Borer Confirmed in Maplewood

The Minnesota Department of Agriculture has confirmed a case of Emerald AshBorer (EAB) at Carver Elementary School on Upper Afton Road. This is the first official documentation of EAB in Maplewood. EAB is a non-native beetle that causes widespread decline and death of ash trees. The larval stage of the beetle feeds on the tissue between the ash tree’s bark and sapwood, disrupting the transport of nutrients and water in a tree. If the infestation is high enough, the damage kills the tree. Millions of ash trees have been killed by EAB in eastern and Midwestern states. Maplewood has about 2,038 ash trees on boulevards and in manicured park areas, making up about 21% of park and boulevard trees. There are many additional ash trees in natural areas and on private property. The City’s EAB plan, adopted in 2011, focuses on slowing the spread of the beetles. Strategies include: education, inventory, monitoring, removal, replanting, and firewood management. Maplewood will host educational sessions this summer and fall to help residents identify ash trees and symptoms of EAB. Our city forester will do EAB inspections in late fall and winter, when signs and symptoms of EAB are easiest to see. And in late winter, the MDA will help the city survey ash trees within a mile of the infestation site to determine how wide-spread it is. 

What should Maplewood homeowners do? 

  1. Learn about EAB. Review the information provided online on how to identify an ash tree and symptoms to look for (see links in the box to the right). Attend one of the educational sessions provided by the city this summer or fall.
  2. Report ash with EAB symptoms. Keep an eye on the ash trees in your yard and neighborhood. If they have EAB signs or symptoms, contact Maplewood Public Works at (651) 249-2400 or contact the state’s Arrest-The-Pest hotline (888) 545-6684, (Arrest.the.pest@state.mn.us). Be sure the tree is an ash and has one of the signs or symptoms listed in this article.
  3. If desired, consider insecticide treatment. Ash trees with less than 40% canopy decline may be candidates for insecticide injection. Before deciding to treat a tree, consider the environmental impacts of these chemicals, and be sure you’re committed to repeating treatments every one to three years. The city does not currently allow for insecticide treatment of EAB on boulevard or park trees. If you wish to treat trees with EAB on private land, the city recommends hiring a licensed contractor to do the trunk injection method; the soil drenching method has increased environmental impacts.
  4. Remove infested ash trees in fall or winter. Ash trees should not be removed or pruned during the beetles’ active stage, May through September. So, unless the tree becomes a hazard, do not remove it until October. The wood must be removed off-site and disposed of properly or may be chipped on-site into pieces less than 1” square.
  5. Do not transport ash or firewood out of the metro area.The metro area is under a quarantine that prohibits moving parts of an ash tree, as well as all hardwood firewood, outside the quarantine area.


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