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City of Rochester

Emerald Ash Borer

The City of Rochester's Forestry Division is taking a proactive effort to protect Rochester’s urban forest from an invasive species called the Emerald Ash Borer.The emerald ash borer 

What is the Emerald Ash Borer?

The Emerald Ash Borer (EAB) is an exotic beetle that was imported accidentally into the United States on packing material that originated in Asia. EAB larvae feeds on the inner bark of ash trees, disrupting the tree's ability to transport water and nutrients. The EAB has already killed tens of millions of trees in the states where it has been detected. Other than New York, the beetle has been detected in 21 other states including Illinois, Indiana, Kentucky, Maryland, Michigan, Minnesota, Missouri, Ohio, Pennsylvania, Virginia, West Virginia, Wisconsin, Colorado, Connecticut, Georgia, Iowa, Kansas, Massachusetts, North Carolina, Tennessee, New Hampshire as well as Ontario and Quebec Canada.

Has the Emerald Ash Borer been detected in the City of Rochester?

Forestry Division personnel discovered the EAB in and around Upper Falls Park on St. Paul Street in Downtown Rochester in June 2011. Seventeen ash trees in the area were infested. A larger EAB infestation was detected in other parts of Monroe County (specifically, Scottsville) in 2010. Working closely with federal and state agencies, the City's Forestry Division has set up traps in ash trees throughout the city that can detect the EAB. 

A leaf with signs of ash borer infestation.Has Rochester done an inventory of its ash trees?

There were approximately 4,600 ash trees in the City of Rochester's right of way (this includes the tree lawn in between the sidewalk and curb, parks, cemeteries, etc). These trees made up approximately 8% of all City-owned trees. International Society of Arboriculture-certified arborists have performed a condition rating of all the ash trees in the City's right-of-way. Condition ratings are based on overall health and structure of the trees.

How is Rochester treating ash trees that are in good condition?

City Forestry crews have treated 3,700 ash trees that are in good condition with an highly effective insecticide called "TREE-age." Forestry crews injected TREE-age directly into the tree’s vascular system through several plugs that seal it inside the tree. This treatment is expected to protect the tree for a period of two to three years. Retreatment is scheduled for 2014.    

How is Rochester treating ash trees that are in poor condition?

Ash trees in the poorest condition are poor candidates for treatment and are most vulnerable the EAB's effects. The Forestry Division has identified 900 of the trees as candidates for removal in anticipation of their infestation.  

Ash treeWill ash trees that are removed be replaced?

Yes. All ash trees that have been removed have been replaced with a more appropriate species, unless an owner objected to having a new tree planted. Property owners will be notified if the City is planning to remove a tree near their property.

Helpful Links

What should I do if I still have questions? 

If you have additional questions or suspect that an ash tree is dying, you can call 311 (outside of the city, call 585-428-5990) or call the Forestry division at (585) 428-7581. 





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