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Posted on: June 2, 2019

Emerald Ash Borer

Ash Tree

Emerald ash borer (EAB) is an invasive forest insect from Asia responsible for the deaths of millions of ash trees throughout the eastern half of the U. S. and southeastern Canada. EAB infests and kills weak and healthy ash trees alike, and all species of ash native to North America are vulnerable to EAB attack. With nearly 1 billion ash trees in the state, the spread of EAB will have a serious impact in Minnesota. And although frigid winter temperatures in northern Minnesota may help to slow the spread and survival of EAB, cold won't stop it completely.

Though a substantial number of EAB larvae are likely to be killed by winter temperatures each year, what is most concerning are the more cold-tolerant individuals that are more likely to survive. Over time, these more cold-tolerant larvae could begin to represent a greater portion of the reproductive population. This will not actually lower the existing supercooling point of EAB larvae, but it could eventually result in a population with a lower average supercooling point. While frigid winter temperatures may be an added benefit for now, we should not allow the cold to give us a false sense of security when it comes to actively managing Minnesota's ash resource


  1.     Guidelines to Slow the Growth and Spread of Emerald Ash Borer
  2.     Recognizing Insect Galleries in Ash Trees in Minnesota
  3.     How can I check for emerald ash

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