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EAB Management Strategies

Current Emerald Ash Borer Management Strategies
Saint Paul Forestry employs carefully planned management strategies to reduce the spread of the emerald ash borer (EAB). Strategies such as monitoring, sanitation, and insecticide treatment work to reduce the population of EAB in a known infested area. Strategies such as structured removal reduce the overall population of poor quality, susceptible ash throughout the city. This multifaceted approach to managing EAB will spread out the cost of EAB management over a longer, more manageable period of time and allow for a more efficient response. The following is a comprehensive list of strategies along with descriptions for reducing the population of EAB. For more information on emerald ash borer, view this FAQ.

Current Year Management Plan (updated annually)
City of Saint Paul Emerald Ash Borer Management Program

  • Forestry staff survey known infested areas of the city to identify infested ash trees annually between January and April. Infested ash tree removals take place prior to the beginning of the EAB active period of May 1st. 
  • Forestry staff inspect private and public property ash trees for EAB upon the request of citizens.


  • Forestry staff remove all publicly owned EAB infested ash trees that are identified prior to the beginning of the EAB active period (around May 1st).
  • Ash trees, stumps, and firewood known to be infested with EAB are considered a nuisance according to Title XVII, Chapter 175A of the City of Saint Paul Legislative Code of Ordinances.  Private property owners are issued abatement orders for EAB infested ash trees, stumps or firewood found on their property.
 Buffer Map 2015.jpg
  2015 Saint Paul EAB infestation map.
Insecticide Treatment
  • One of many efficient, cost-effective tools used to assist in slowing the spread of EAB, insecticide treatments have been in use since 2011 on public property ash trees in Saint Paul.
  • Treatment of public trees is employed as a means of further reducing EAB populations.
  • Criteria for boulevard ash tree treatment:
    • 10–20 inches DBH (diameter at breast height).
    • Good overall health without structural defects.
    • Good growing location with wide boulevards and no utility conflicts.
  • Public trees are currently being treated with TREE-age® (active ingredient Emamectin benzoate) via trunk injection method. Soil drenches are avoided due to the high potential of shallow groundwater contamination and toxicity to mammals, fish, and aquatic species.

Treatment Pic.jpg         
Public ash tree in Saint Paul being treated for EAB



Structured Removal

  • Goal of reducing the overall percentage of ash trees on public land in Saint Paul.
  • Selected trees include those of overall poor quality and structure or those that may interfere with overhead utilities or require frequent maintenance.
  • Click here for additional information on structured removal.

SR photo.jpg
Structured removal of ash on the East side.

 Branch Sampling
  • The City of Saint Paul is partnering with the Minnesota Department of Agriculture, the University of Minnesota, and the U.S. Forest Service on two projects that sample public ash trees to detect the presence of EAB and parasitic wasps released in the area since 2011. The Cities of Minneapolis, Falcon Heights, Lauderdale, and Roseville have also joined the effort.

             Branch samples ready for debarking.

 Collaborative Efforts

  • Forestry works collaboratively with the Minnesota Department of Agriculture, the United States Forest Service, the University of Minnesota, and the Minnesota Department of Natural Resources as well as neighboring communities on developing best management practices for reducing the spread of EAB.
  • The MDA is an indispensable partner, providing general assistance in EAB management, ash surveys, EAB biocontrol releases, and public outreach.
  • Through the collaborative work with partner agencies and employing EAB management strategies, the City of Saint Paul is effectively slowing the spread of EAB.
             EAB biocontrol release in the Summit-Dale area.

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