Invasive Animals and Insects of New York


Emerald Ash Borer (EAB) (Agrilus planipennis)
     The emerald ash borer was first discovered in the United States in 2002 in southeastern Michigan This Asian beetle infests and kills North American ash species (green, white, black, and blue ash). The adult beetles are roughly 3/8 to 5/8 inch long and have metallic green wing covers and a coppery red/purple abdomen.
     Adult beetles may be present from May-September, but are most common in June and July. Each female lays approximately 30-60 eggs during an average lifespan. The eggs are deposited individually in bark crevices. Once the larvae hatch they chew through the bark and into the phloem and cambial regions of the ash trees. It is this activity that eventually leads to the death of infested trees. The larvae feed on the phloem for several weeks, creating serpentine galleries (S-shaped) which effectively girdle the tree. Unable to transport the nutrients that it requires, the ash tree usually dies within 2 to 4 years of becoming infested.
     There are some signs and symptoms that may develope in cases of emerald ash borer infestation. The tree canopy may become increasingly thin as foliage wilts and branches die back. The trunk may exhibit jagged holes left by woodpeckers feeding on the ash borer larvae. Small, "D" shaped exit holes may be observed on the trunk where adult beetles have emerged. And epicormic shoots and branches may sprout on the trunk or branches. Emerald ash borer is a serious threat to North America's native ash tree populations. If you notice any of these signs/symptoms on an ash tree notify your state Department of Agriculture, State Forester, Cooperative Extension Office, or local Conservation District.

If you have any questions or have discovered a possible emerald ash borer infestation additional information can be found at: and search "emerald ash borer"
Call NYS DEC at 1-866-640-0652
Contact your county's Cornell Cooperative Extension

The Monroe County Emerald Ash Borer Task Force
The Monroe County Emerald Ash Borer Task Force (MCEABTF) is a volunteer organization of forestry professionals, scientists, natural resource managers, local officials, and private citizens. The MCEABTF has organized to facilitate a science-based response to the economic, ecological, and public safety impacts within the forests and communities of Monroe County. If you would like to assist in the goals of the MCEABTF please contact Mark Quinn at:
The MCEABTF has created an informational flyer to help residents identify and assess the risks of EAB in their community. It can be viewed HERE.

Asian Longhorned Beetle (ALB) (Anoplophora glabripennis)
     The Asian Longhorned Beetle is an invasive insect that feeds on an assortment of woods including maple, birch, elm, ash, poplar, horsechestnut, willow, and other hardwoods. These 1.5 inch long, black and white spotted creatures have long antennae and are native to China and Korea. Maples are preferred hosts for the ALB, which causes a decrease in healthy sugar bush, impacting the maple syrup industry. ALB also damage the structural integrity of some trees, creating hazardous situations from falling trees or branches.
     Signs of infestation include round .5 inch holes or depressions in trees or bark seen in July, sap dripping from these holes, and sawdust piling up at the bottom of a tree or branch.

Hemlock Woolly Adelgid (HWA) (Adelges tsugae)
      The hemlock woody adelgid is a native species of Asia that extracts nutrients from hemlock foliage, preventing the growth of needles, causing needle discoloration, impairing tree health. The infestation is usually fatal after several years. Wind, birds, other wildlife and humans all assist in the spread of the adelgid. During the summer of 2017, the adelgid was dicovered in the Town of Lake George. This is the first known occurance of the HWA in the Adirondack Park. Effective management of HWA involves the application of insecticides on the tree around the fall or spring. To find out how you can properly ID Hemlock Woolly Adelgid and report it if noticed click HERE.

Eurasian Boar (Sus scrofa scrofa)
     Native to Europe and Asia, the Eurasian boar are a threatening invasive species to New York. These animals have large negative impacts on native plants, native wildlife, livestock, agriculture, and humans. They are highly adaptable and their population can double in one year. Report any siting of a Euarasion boar to the DEC regional wildlife office.

Sirex Woodwasp (Sirex noctilio)
     The Sirex woodwasp is one of the top 10 most serious forest insect pest invaders worldwide. This pest causes large amounts of damage to pine plantations and has no known native natural controls. Pine trees are infected as the female Sirex woodwasp injects the tree with a toxic mucus while laying eggs. If you think you have found Sirex woodwasp, take a photo and email it to the Forest Health team at or call (866) 640-0652.

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Page last updated: October 27, 2017