Invasive species are non-native plants and animals that spread rapidly causing ecological and economic harm. Common examples are the emerald ash borer, Norway maple, and Asian clam. Invasive species are usually spread by humans. Once established, they become increasingly difficult to manage. Early detection of invasives is key to containment and practical management.
Nuisance species may be native or non-native, and may cause ecological and economic harm. Common examples are poison ivy and Canadian geese.
The Hemlock Woolly Adelgid lives and feeds on hemlock trees. Infested trees can die within 2 years, although 10-12 years is more common.
Exotic bush honeysuckle is perhaps the most widespread exotic invasive in the U.S. Widely dispersed by birds, it is now found in at least 38 states.
Learn how to identify the Emerald Ash Borer, monitor your Ash trees, detect and report possible EAB in your trees, and more, with resources we've compiled on this site.
First found in New York in 1996, the Asian Longhorned Beetle is a serious threat to our maples and other hardwood trees.
Thought to have been introduced as packing material in crates from China, Japanese stiltgrass can grow in a variety of habitats.
Giant hogweed is one of New York's most striking and dangerous invasive plants. Learn how to recognize and manage it safely on our site.
Last updated June 4, 2018