Emerald Ash Borer found in Manitowoc County

emerald ash boerer

MANITOWOC COUNTY, Wis. (WBAY) – The tree-killing Emerald Ash Borer has been found in Manitowoc County for the first time.

The invasive insect was discovered on a private woodlot in the Town of Schleswig, according to the Wisconsin Department of Agriculture, Trade, and Consumer Protection.

The owner of the property noticed damage to ash trees and reported it to the state’s Emerald Ash Borer hotline. Investigators collected larvae from two “heavily infested trees.” The samples were confirmed by the U.S. Department of Agriculture.

The discovery does not change the quarantine status. The county has been under quarantine since 2014 when the Emerald Ash Borer was discovered in nearby Calumet and Outagamie Counties.

The quarantine means no one can transport firewood from Manitowoc County to non-quarantine counties.

The invasive species is native to China and entered the U.S. in 2002. The insect is not a threat to humans, but kills ash trees of all sizes.

The DATCP passed along these tips:

  • Watch ash trees for signs of possible EAB infestation: Thinning in the canopy, D-shaped holes in the bark, new branches sprouting low on the trunk, cracked bark, and woodpeckers pulling at the bark to get to insect larvae beneath it.
  • If your property is within 15 miles of a known infestation, consider preventive treatments. Whether to treat depends on several factors: the age of the trees, the size of the trees, and the number of trees. Treatment costs vary depending on size of the tree and whether you do the treatments yourself or hire a professional.
  • Consider planting different species of trees that are not susceptible to EAB.
  • Contact a professional arborist for expert advice, and visit emeraldashborer.wi.gov for detailed information.