Pest Alerts!

Spotted Lanternfly & Emerald Ash Borer
Phone NumberEmail Address

The Emerald Ash Borer:

The 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.

The NJDEP State Forestry Services recommends:

  • IDENTIFY Ash trees. Ash species have opposite branches and leaves and a compound leaf with 5-11 leaflets. The bark on older trees has a unique diamond-shaped ridge bark, but younger trees may have smoother bark. Click here for images of an Ash tree and Ash tree look-alikes. 
  • 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.) 

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

Click here  To view the STC criteria that will help you decide whether to remove an ash tree or treat it. 

Click here  To consult the Managing Emerald Ash Borer Decision Guide.  

Click here  For insecticide treatment options to protect ash trees from the Emerald Ash Borer.

Click here   For FAQs regarding potential side effects of EAB insecticides.

Click here  To view the 2016 amendment to the Princeton Trees and Shrubs ordinance that exempts ash trees from some requirements of tree removal permits.  

Click here  To watch the STC's June 23, 2016, public information session on the Emerald Ash Borer, videotaped by and courtesy of Princeton TV.

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

For more information, the following websites are helpful:

How to Help

You can adopt an ash tree or contribute to the STC Fund to Save Ash Trees.

Click here for information about the Princeton Emerald Ash Borer "Adopt an Ash Tree" program and to download the participation form.  (The form is also available at Princeton Public Library and at the office of the Municipal Clerk, 400 Witherspoon Street.)

Click here to download the STC Contribution Form.  

The Spotted Lanternfly: 

ALERT:  Now seen in Princeton, as of summer 2019, on three Ailanthus trees (Tree of Heaven). Residents are asked to report sightings by calling the New Jersey Spotted Lanternfly Hotline, 1-833-223-2840 (BADBUGO), and leaving a message with their contact information and details of the sightings. Residents can also email .

The Spotted Lantern fly, Lycorma delicatula, is a pest new to the United States. This invasive plant hopper, initially discovered in Berks County,Pennsylvania, in 2014, is native to Southeast Asia and poses a threat to forests, ornamental trees, orchards, vegetables, grapes, hops, and other agricultural commodities. Since its initial discovery in Pennsylvania, it has spread to infest portions of 13 counties in that state. Recently, it has been discovered in New Jersey in Warren, Hunterdon, and Mercer Counties.  The New Jersey Department of Agriculture has recently enacted a state quarantine in these counties to restrict the movement of any living life stage of this insect to uninfested areas of the state. All life stages of this insect, from nymphs to adults, can fly, hop, and drop right into or onto vehicles; thus, vehicles and equipment can easily and quickly help it spread.

More information can be found on the New Jersey Department of Agriculture website

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Relevant Documents

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2018 Annual Police Report22

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