Emerald Ash Borer Management

Current Year Management Plan: City of Saint Paul Emerald Ash Borer Management Program

Forestry utilizes several management strategies to reduce the population growth of the emerald ash borer (EAB). Strategies such as monitoring and insecticide treatment work to slow the population growth of EAB in Saint Paul; while the structured removal of infested trees allows for a more diverse pallet of new trees to be planted. This multifaceted approach to managing EAB will spread out the cost of 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. 

Monitoring

  • Forestry staff survey city boulevard trees to identify declining ash trees annually. If a resident believes their boulevard ash tree to be in severe decline due to EAB, an inspection by city staff may be performed upon request.
  • Forestry no longer surveys private properties for EAB infested trees due to a lack of personnel to complete the survey. However, private property ash trees that die from EAB and become dangerous may still require removal under city ordinance. Please contact a licensed tree care company if you would like to be proactive in managing ash tree(s) on your private property.

Removal

  • Public ash trees that show signs of severe decline due to EAB infestation are a priority for removal.
  • Structured Removal: the removal of blocks of EAB infested ash trees. Once removed, these trees are replaced with a more diverse range of species.

Insecticide Treatment

  • Insecticide treatments have been in use since 2011 on public property ash trees.
  • Treatment of public trees was employed as a means of slowing the population growth of EAB.
  • These trees will eventually be removed as part of ongoing Structured Removal plans. 
  • Given city budgets and levels of infestation across the city, no new trees are able to be added to this program. 
  • Public trees that were chosen for this program are treated with emamectin benzoate via the trunk injection method.
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Last Edited: March 29, 2021