Pest Alert: What You Need to Know About the Emerald Ash Borer

Emerald Ash Borer adult (Photo State of NJ Department of Agriculture)

The exotic emerald ash borer (EAB) has been killing ash trees across North America. Native to China, eastern Russia, Japan, and Korea, it was first discovered near Detroit in 2002 and has since spread to 25 states, including New Jersey.

Ash in New Jersey Facts

• Forests contain 24.7 million ash trees

• 24% of all forested land contains ash

• Ash is found in forests throughout the state, but concentrated in northern New Jersey

• Ash has been commonly planted as a street and landscape tree throughout the state

EAB: Deadly Damage to Millions of Trees

This metallic green insect infests and kills ash trees—all ash species are susceptible, with the exception of mountain ash. EAB larvae feed on the inner bark and disrupt the movement of water and nutrients, essentially girdling the tree. This insect often infests the upper branches of the tree first and may affect branches as small as 1” in diameter. It takes 2-4 years for infested trees to die, but mortality is imminent.

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