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Priority Invasives

WNY PRISM Species Priorities were first established in 2015, having been developed through our Terrestrial and Aquatic Working Groups. The Early Detection and Watchlist/Approaching Region Priority lists are updated as new threats emerge.

Working Groups communicate through in-person meetings and email. If you are interested in being part of our Working Groups, please contact Andrea Locke, WNY PRISM Coordinator at

Invasive Species Prioritization Tiers

NYS Invasive Species Tiered Ranking System

The New York State Invasive Species Program has developed a tiered ranking system for invasive species, to provide management and prioritization assistance. WNY PRISM has currently ranked 85 species (available here) and will continue to work through the process of ranking of additional species.

Tier 1 and Tier 2 species (including early detection and watchlist species) represent WNY PRISM’s highest priority species, followed by Tier 3 and lastly, Tier 4.

Early Detection Priorities

1. Ampelopsis brevipendunculata Porcelain Berry
2. Aralia elataJapanese Angelica Tree
3. Brachypodium sylvaticumSlender False Brome
4. Cytisus scoparius Scotch Broom
5. Eichhornia crassipesWater Hyacinth
6. Microstegium vimineumJapanese Stiltgrass
7. Nymphoides peltata Yellow Floating Heart
8. Persicaria perfoliataMile-a-Minute
9. Pistia stratiotesWater Lettuce

Watchlist/Approaching Region Priorities

1. Aldrovanda vesiculosaWaterwheel
2. Anoplophora glabripennisAsian Longhorned Beetle
3. Channa argusNorthern Snakehead
4. Hypophthalmichthys molitrixSilver Carp
5. Hypophthalmichthys nobilisBighead Carp
6. Impatiens glanduliferaHimalayan Balsam
7. Lycorma delicatulaSpotted Lanternfly
8. Oplismenus undulatifoliusWavyleaf Basket Grass