Emerald ash borer (EAB) is a nonnative invasive insect that destroys ash trees. Quarantines have been placed in 14 counties to help slow the spread of EAB to other areas. It's against the law to move the following items out of EAB-quarantined counties:
Firewood from hardwood trees
Entire ash trees
Ash limbs and branches
Ash logs or untreated ash lumber with bark attached
Uncomposted ash chips and uncomposted ash bark chips greater than 1 inch in two dimensions.
Late winter is a good time to discover EAB infested ash by looking for woodpecker activity. Here is what to look for:
Light-colored patches on the trunk and large branches where woodpeckers have flaked off bark.
Holes within the light colored patches where woodpeckers have dug out larvae.
Overview of EAB winter physiology and results of some current research that may help slow the rate of population expansion, it won't be enough to stop the spread of EAB. Learn More »
What you need to know
EAB kills ash trees, and it does so in great numbers. Already it has killed millions of ash trees in North America. EAB will have a huge effect on Minnesota's landscape and the 998 million ash trees that grow in our cities and forests.
Recognize the signs of an EAB-infested tree: heavy woodpecker activity on tree, dying branches in the top canopy, sprouts around the tree base, vertical cracks in the bark, S-shaped tunnels under the bark, and 1/8-inch D-shaped exit holes in the bark.