Emerald Ash Borer

Emerald Ash BorerThe Emerald Ash Borer (EAB), a non-native insect pest that kills all species of Ash trees, has now been found in Princeton as well as in surrounding counties. This highly destructive insect has killed millions of Ash trees including many trees in our area. Princeton has formulated an EAB management plan for its approximately 1,800 Ash street trees; the plan includes tree removal and selective treatment. There is growing evidence that the White Fringetree is infested by the EAB as well.

Recommendations for EAB Control

The New Jersey Department of Environmental Protection State Forestry Services recommends:

  • Identify Ash trees - Ash species have opposite branches and leaves and a compound leaf with 5 to 11 leaflets. The bark on older trees has a unique diamond-shaped ridge bark, but younger trees may have smoother bark.
  • Monitor your Ash trees for the Emerald Ash Borer - You will know when the risk of mortality becomes urgent. Look for dying branches at the top of the tree, woodpecker damage, galleries under the bark, d-shaped holes, bark splits, sprouting at tree base and along trunk and green adult beetles.
  • Use traps to detect the Emerald Ash Borer in your community or woodlot. If the Emerald Ash Borer is in the area, it will be attracted to these purple prism traps.
  • Spread the message: don't move firewood! Visitors who bring infested firewood to second homes or campgrounds near you put your trees at risk. Use only locally sourced or certified firewood. (More information on firewood (PDF).)

To determine the health of your Ash trees, consult Assess Ash Trees for Emerald Ash Borer (PDF).

Shade Tree Commission Session on Emerald Ash Borers

The Shade Tree Commission's June 23, 2016, public information session on the Emerald Ash Borer, videotaped by and courtesy of Princeton TV.

Further Information

For up-to-date EAB information, consult the Emerald Ash Borer Information Network. For New Jersey, consult the New Jersey Department of Agriculture's EAB website.