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Insects & Diseases

There are many native and non-native insects and diseases that affect trees in the Northland. Here are some of the common insects and diseases found in our area, how to tell if they are a problem, and what to do if they are.


  • Emerald Ash Borer – The Emerald Ash Borer (also known as EAB) is native to China and was first discovered in the United States in the summer of 2002 near Detroit, MI.

On October 23, 2015, after waiting for two years since the August 2013 confirmation of emerald ash borer in neighboring Superior, WI, the insect was positively identified in the City of Duluth in ash trees located near the beach house and recreation fields on Park Point. In news reports, Duluth city staff and MN Dept of Ag describe what was found and plans for quarantine to limit the spread into St Louis County. Ash trees are native (and abundant!) in northern Minnesota forests.  Because they can tolerate our cold climate and the challenging conditions of city life, they  are often planted on our streets and in our yards .

Emerald Ash Borer is lethal to all species of ash trees. Levy Tree Care uses ArborMectin to protect ash trees from the EAB larvae. If you have an ash tree in your yard and would like it assessed and protected, or suspect you have an ash tree and would like to know for sure, contact us to set up an appointment.

Here are some Emerald Ash Borer resources to consult:

  • Birch Leaf Miner
  • Forest Tent Caterpillar