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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 ash 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 responses. The following is a comprehensive list of strategies along with descriptions for reducing the population of EAB.

City of Saint Paul EAB Manaagement Plan.pdf

  • Survey known infested areas of the city and look for infested ash trees between December and April. Infested ash tree removals take place prior to the EAB active period of May 1 to August 31. 
  • Make private property inspections for EAB upon the request of homeowners. Conduct routine surveys for EAB on public and private property in the known infested areas shown on the map to the right. 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.
  • Utilize insecticide, one of many efficient, cost-effective tools used, to assist in slowing the spread of EAB. Treatment of boulevard trees is not employed as a means of saving trees in the long run.
  • 2011: 299 boulevard ash trees 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 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 included the re-treatment of boulevard ash trees in Saint Anthony Park (treated in 2011).
  • 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 due to the reduced possibility of surface and groundwater contamination. Soil drenches are avoided due to 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
  • Reduce the overall percentage of ash trees on public land.
  • 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 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.
  Hamline Avenue Structured Removal.
 Branch Sampling
  • The City of Saint Paul is partnering with the University of Minnesota, the U.S. Forest Service, and the Minnesota Department of Agriculture for a three year study (2012–2014) to randomly sample public ash trees for the presence of EAB. The Cities of Minneapolis, Falcon Heights, Lauderdale, and Roseville have also joined the effort.
  • Two branches, three feet in length, are removed from sampled trees and later 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
  • 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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