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Isanti officials weigh options as emerald ash borer threatens hundreds of city trees
Summary
City staff presented an inventory showing 477 ash trees citywide, with 22% already symptomatic; council voted to apply for a state relief grant and tasked staff with drafting a parks-focused removal and replacement plan while debating whether to include right-of-way trees in the application.
City staff told the Isanti City Council that an inventory by Davey Resource Group found 477 ash trees within city limits — 396 in street right-of-ways and 81 in parks and around city facilities — and that 22% of those trees are currently showing symptoms consistent with emerald ash borer infestation.
Jared (city staff) said the pest was first detected in Minnesota in 2009 and that infested ash trees typically die within three to five years; staff estimated a longer local timeline of roughly six to 10 years for the majority of trees to die. He recommended removing and replacing most park trees over the next five years or, in select high-value locations, treating lightly infested trees with injected pesticides…
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