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EAB Management Strategies

Current Emerald Ash Borer Management Strategies

The purpose of this page is to inform the public of the management strategies Saint Paul Forestry employs to reduce the spread of emerald ash borer (EAB).  Strategies such as monitoring, sanitation, and ash treatment work to reduce the population of EAB in a known infested area.  Strategies such as structured removal work to reduce the overall population of poor quality ash throughout the city.  The multi-faceted approach to managing EAB will spread the cost of EAB management over a longer period of time and allow for a more manageable response.  The following is a list of strategies, with descriptions for reducing the population of EAB.


  • Forestry staff surveys known infested areas of the city looking for infested ash trees during the months from December to April, with infested ash tree removals taking place prior to the EAB active period of May 1 to August 31. 
  • Forestry staff will make private private property inspections for EAB upon the request of the homeowner, but Forestry conducts routine surveys for EAB on public and private property in the known infested areas shown on the map to the right.  Click the link for Forestry contact information
 Infestation Map.jpg
  2013 Saint Paul EAB infestation map

*Scroll down the sidebar to "Title XXVII - Trees", for information on tree

  • Prompt removal of infested ash trees must take place during the EAB inactive months from September 1 to April 31.

  Removal of infested ash trees

  • The City of Saint Paul employs insecticide as just one tool to assist in slowing the spread of EAB, and as a means of response to a more manageable time and expense. Treatment of boulevard trees is not employed as a means of saving trees for the long term.
  • 2011: 299 boulevard ash trees were treated with a trunk injection of TREE-age (emamectin benzoate) in a one mile radius of the original Saint Anthony EAB infestation.  
  • 2012: 400 boulevard ash trees were treated with a trunk injection of TREE-age in the expanded treatment areas of Saint Anthony Park, Como, Hamline-Midway, Union Park, Summit-University, and Summit Hill neighborhoods.
  • 2013: Treatment areas will include the re-treatment of boulevard ash trees in Saint Anthony Park (treated in 2011), and an undetermined expansion of the 2012 treatment area.
  • 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
  • The trunk injection method of administering Emamectin benzoate is the preferred method, based on the reduced possibility of surface and groundwater contamination.  Soil drenches are avoided, based on the high potential of shallow groundwater contamination and toxicity to mammals, fish and aquatic invertebrates
         Click on the link and view the "Considerations for Ash Treatment" for more                                               information on ash treatment.
 1 Mile Buffers west-Jan 2 2012.jpg   2013 west ash treatment area with 1-mile buffer

 1 Mile Buffers east-Jan 2 2012.jpg
  2013 east ash treatment area with 1-mile buffer
 Structured Removal

  • Structured removal is a strategy used to reduce the overall percentage of public ash across the City
  • Similar to the use of ash treatment, structured removal is used as a means of responding to the effects of EAB over a longer period of time 
  • Selected trees are of poor quality, may have poor structure, may have conflicts with overhead utilities or require frequent maintenance
  • Click the link for additional information on Structured Removal
  Hamline Avenue Structured Removal
 Branch Sampling

  • Saint Paul is partnering with the UMN, USFS and MDA for a three year study (2012-2014) to randomly sample public ash trees for the presence of EAB. Partner cities include:Minneapolis, Falcon Heights, Lauderdale, and Roseville.
  • Two branches, three feet in length are removed from the sample trees, debarked, and inspected for the presence of EAB
  • Roughly 140 trees were sampled in the first year of the study (2011/2012), in the following locations

  Samples ready for debarking
 Collaborative Efforts

  • Saint Paul Forestry works collaboratively with the Minnesota Department of Agriculture (MDA), United States Forest Service (USFS), University of Minnesota (UMN), Minnesota Department of Natural Resources (MNDNR) and neighboring communities on the development of best management practices for reducing the spread of emerald ash borer
  • 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 our partner agencies and employing EAB management strategies Saint Paul is effectively slowing the spread of EAB
  EAB biocontrol release in the Summit-Dale area

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