Field Guide & Observation

Be Alert for Invasive Species

Ridge top lakes & forests

Catskill Regional Invasive Species Partnership

Check out the Catskill Regional Invasive Species Partnership (CRISP). Invasive species can disrupt the delicate balance of our ridge top ecosystems, outcompeting native plants and altering the habitats that local wildlife depend upon.

Species Report

Emerald Ash Borer

Agrilus planipennis

Ash bark showing distinctive D-shaped Emerald Ash Borer exit holes
Distinctive D-shaped exit holes in ash bark left by Emerald Ash Borer. Photo: Daniel Herms, The Ohio State University, Bugwood.org.

Emerald Ash Borer was confirmed in New York on 17 June 2009. Most trees die within 2 to 4 years of becoming infested. The emerald ash borer is responsible for the destruction of over 50 million ash trees in the U.S. since its discovery in Michigan.

Adult beetles leave distinctive D-shaped exit holes in the outer bark of the branches and the trunk. Adults are roughly 3/8 to 5/8 inch long with metallic green wing covers and a coppery red or purple abdomen.

In New York, if you suspect EAB in your ash trees, call the DEC's EAB and Firewood hotline at (866) 640-0652. More info: emeraldashborer.info and DEC EAB.

Adult EAB shown on a penny for scale
Adult EAB on a penny for scale — roughly 3/8 to 5/8 inch long. Photo: Wikimedia Commons.
Species Report

Asian Clam

Corbicula fluminea

Asian Clams (Corbicula fluminea) showing light green and brown ridged shells
Asian Clams with distinctive concentric ridges. Photo: Lake Champlain Basin Program.

The Asian clam, Corbicula fluminea, is a small bivalve native to southern Asia, the eastern Mediterranean, and Australia. They are usually less than 1.5 inches in size, with a light green / light brown shell and distinctive concentric ridges.

Asian clams were found off Lake Avenue Beach in Lake George Village in August 2010, with initial concentrations of up to 600 clams per square meter across approximately 2.5 acres.

Species Report

Eurasian Milfoil

Myriophyllum spicatum

Eurasian Milfoil (Myriophyllum spicatum) — feathery whorled leaves
Eurasian Milfoil with feathery whorled leaves. Photo: Wikimedia Commons.

Eurasian milfoil reproduces through fragmentation. It spreads rapidly and displaces beneficial native plant life, makes swimming difficult, and can devalue waterfront property. Under optimum conditions, milfoil may grow up to an inch per day.

Milfoil most likely arrived as a "stowaway" fragment attached to a boat or trailer. Milfoil can live out of water for many hours if it remains moist.

Researchers collecting invasive Eurasian Watermilfoil from a lake
Researchers collecting invasive Eurasian Watermilfoil from a lake. Photo: U.S. Army / Wikimedia Commons.