Protective Zones to Prevent the Spread of Oak Wilt Disease

New York State’s Department of Environmental Conservation (DEC) and Department of Agriculture and Markets (DAM) announced that the oak tree disease, oak wilt, has been detected in the Central Islip area of the town of Islip, Suffolk County. The disease was identified by the Cornell Plant Disease Diagnostic Clinic after samples from a symptomatic oak tree were submitted by a concerned tree care professional.

This is the second location in New York that oak wilt has been confirmed, the first being in Schenectady County in 2008 and 2013. After the provided oak samples tested positive for the fungus that causes the disease, the tree care professional removed and destroyed four trees that exhibited signs of being infected. There is no known treatment to contain and kill the oak wilt fungus other than to remove the infected trees as well as any surrounding host oak trees.

Read the Order for the establishment of Protective Zones to Prevent the Spread of Oak Wilt disease pursuant to ECL Sections 9-1303.

Oak Wilt MapThere a simple steps vegetation managers can do to prevent the spread of oak wilt.  We can protect our oaks by pruning during the dormant season (see video).  Additional resources are also available at Though NYSDEC understand the challenges with changing tree line maintenance operations, they need utility pruning/cutting schedules for oak to be adjusted accordingly.

Oak Wilt Pruning Card-1Additionally, Plant Protective Zones are currently being filed in Brooklyn and Suffolk County in New York.  The zones are in place in Canandaigua and Central Islip.  This means oak wood and firewood cannot leave these zones.  Long Island vegetation managers have been cooperating by chipping their trees on site which makes that wood waste safe and legal to move out of zones.

Your attention and anticipated cooperation is greatly appreciated.  Please call the number below with questions.  NYSDEC will pass along new Plant Protective Zone specifics as they are approved.

Click here for the Oak Wilt Fact Sheet.

Click here for Protect Your Oaks sheet.

Jennifer Kotary
Oak Wilt Operations Coordinator, Division of Lands and Forests - Forest Health
New York State Department of Environmental Conservation
625 Broadway Albany, NY 12233-4253
P: 518-408-0429  C: 518-410-6360