City of Woodland

~Settled in 1882~

Natural Resources

Emerald Ash Borer
The following information comes directly from the Minnesota Department of Natural Resources (MnDNR) or the Department of Agriculture websites. For additional information, please visit the MnDNR website at or the USDA website at The links within the article will take you to the MnDNR website or the Department of Agriculture website.

photo: Signs and symptoms of EAB

What you need to know about EAB

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.
  • If you think your tree is infested with EAB, refer to the Signs and Symptoms of EAB in Ash Trees slide show for more examples. Also review the reference for recognizing insect galleries?external linkin ash trees in Minnesota.
  • If your ash tree is showing other signs, visit the What's wrong with my ash tree??external linkonline diagnostic tool to help identify problems caused by insects, diseases, and nonliving factors.
  • To report a possible EAB infestation, contact the Arrest the Pest Hotline at external linkor 888-545-6684.
  • Consider insecticide treatments only when your property is within 15 miles of an EAB infestation. More information ?external link
  • Do not transport firewood, even within Minnesota.


Ash Tree Identification

Ash Tree Identification (PDF: 7.95 MB / 2 pages) 


What can I do about EAB?

  • Don't import materials to Minnesota that could harbor EAB such as ash firewood. MDA Certified Firewood Certificate
  • Don't move firewood unless it's MDA Certified firewood (look for the MDA Certified Seal)
  • Remember that it is illegal to move all hardwood firewood outside of EAB quarantine counties of Anoka, Chisago, Dakota, Fillmore, Hennepin, Houston, Olmsted, Ramsey, Scott, and Winona Counties unless it's MDA Certified firewood.
  • Become knowledgeable about recognizing EAB and remain vigilant to the condition of your ash trees.
  • Stay informed on EAB by signing up to our monthly e-newsletter, The New Plant Pest Insider
  • If you suspect a reportable pest
    • Note the exact location
    • Take a digital photo if it is possible
    • Contact Arrest the Pest
      Voicemail: 888-545-6684

Best Management Practices for Known Emerald Ash Borer (EAB) Infested Areas

Authored by Minnesota Department of Agriculture, Plant Protection Division, August 2009 and Reviewed by Minnesota EAB Science Advisory Group, September 2009


EAB infestations are difficult to identify in the early stages of the infestation. EAB infestation areas grow in diameter via the natural spread of the insect and through non-connected satellite infestations which are created by both artificial and natural dispersion. For these reasons, when new EAB infestations are discovered, quarantines are enacted on a large scale (county or greater) with the assumption that the infestation is spread beyond what is observed – both in terms of the size of individual pockets of infestation and the distribution of those pockets over an area. However, while the quarantine necessarily covers a large area where EAB may be present, the distribution of EAB is likely not uniform throughout the quarantine.

For this reason, areas called “Known EAB-Infested Areas” have been designated. Known EAB-Infested Areas are areas where trees infested with EAB have been documented. Ash trees or parts of ash trees removed from these areas have a high probability of being infested with EAB. This is true for trees that appear healthy as well as those that have multiple symptoms of EAB infestation. For this reason, special precautions

are advised for working with ash within these areas. These guidelines should be followed 100% of the time when working within Known EAB-Infested Areas. Also following these guidelines when working elsewhere within the EAB quarantine will provide the lowest degree of risk for movement of EAB.


EAB Active Period - May 2 through September 30

  1. Avoid removal of ash branches, trees, stumps*
  2. If removal is necessary due to a hazardous condition then,
  3. Chip at least outer 1” of bark/wood on-site and transport to the nearest facility that can quickly process the material** Or. . .
  4. Transport at least outer 1” of bark/wood in a vehicle where it is 100% enclosed to the nearest facility that can quickly process the material. Material should remain enclosed until it can be at a minimum chipped.

EAB Dormant Period - October 1 through May 1

  1. Conduct pruning, removal of ash as desired.
  2. Transport at least outer 1” of bark/wood to a facility where it will be processed prior to May 1.


*Active vs. Dormant Period

Branch / Tree / Stump removal should be avoided during the EAB Active Period for two reasons:

1) By postponing pruning until the fall, you can help reduce the risk of EAB spreading. If the tree is left intact during the EAB Active Period, it can provide habitat for EAB adults to lay eggs. But since the adults won’t emerge until the following year, if this tree or branch is cut and properly disposed of during the EAB Dormant Period, any EAB that may exist in the ash material will be destroyed when the wood is destroyed.

2) Material moved during the EAB Active Period may release adults at any time during transportation into a previously un-infested area.

**Disposal of outer 1” of bark/wood vs. whole tree

Only the outer 1” of bark/wood harbors EAB. If this material is removed, the remaining wood may be utilized as desired and does not need to be destroyed.

Options for effectively treating the material include grinding to a small diameter (less than one inch in two dimensions), burning or burying.  

From the Minnesota Department of Natural Resources

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