Emerald Ash Borer (EAB)

History & Current Status of EAB in BayportEmerald Ash Borer (EAB) Opens in new window

EAB was discovered in the city in the fall of 2019 during a routine tree trimming project. An analysis of the infestation showed that EAB was likely present for multiple years prior to its detection, which is consistent with the insect’s path of destruction. Symptoms are slow to appear, and once EAB is actually found, it has likely been present for 3 to 5 years. It is estimated that more than 30% of trees located on city property, rights-of-way, and boulevard areas are ash trees (not including the forested area of Barker’s Alps Park). Once EAB is found in an area, the mortality rate of ash trees increases exponentially. After discovery, the mortality rate of ash trees in 4 to 6 years is 30% and increases to 90% in 8 to 10 years.

City's EAB Response and Treatment Efforts

With the help of the Department of Agriculture, the city has been working to survey ash trees on public property and identify the level of infestation. A total of 363 trees were surveyed, primarily within boulevards, parks, and the cemetery. Of these trees, 10 were confirmed to be infested and 5 potentially infested with EAB. Given the prevalence of ash trees on public property, the Department of Agriculture staff estimates that there are likely 3 to 4 times more ash trees on private property. The city's EAB Management Plan discusses detection and management strategies for property owners related to EAB. 

The city has partnered with Rainbow Treecare to treat certain ash trees on boulevards and in city parks. As a component of this partnership, a discount is being offered to property owners for treatment of ash trees on private property that are at least 10 inches in diameter and in good physical condition. Rainbow Treecare will inspect trees on private property at no cost to determine if EAB treatment is the best option. Treated trees can live a long healthy life but must be retreated every 2-3 years.  Continual treatment is the only effective method of controlling EAB. Refer to the link below for more information.

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