Hydrilla – NOT YET IN REGION

Photo by Robert Vidéki, Doronicum Kft., Bugwood.org

Additional Images

Common Name: Hydrilla
Scientific Name: Hydrilla verticillata
Origin: Asia

Description

Hydrilla is a submerged perennial that looks similar to American waterweed (Elodea canadensis), a common native aquatic plant. Hydrilla has visibly toothed leaves that grow in whorls of 3-8. Undersides may have one spine, or more, and the midrib of each leaf is often reddish. Hydrilla spreads by seeds, tubers, plant fragments, and turions (overwintering buds).

Habitat

This plant is tolerant of a wide range of environmental conditions and can be found in lakes, ponds, reservoirs, rivers, canals, and drainage ditches. It has low light requirements and thrives in both high and low-nutrient waters.

Threat

Hydrilla spreads rapidly and can completely clog waterways and restrict water flow, posing significant threats to aquatic ecosystems and recreational resources.

NYS Threat Ranking Assessment Score = Very High, 91.40

Management

A variety of techniques have been used in the U.S. to manage hydrilla including mechanical removal, physical habitat manipulation, herbicides, and biological agents. Prevention is the most effective control!

Distribution: View Map

Distribution

This species has not yet been discovered in the Adirondack PRISM.