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Photo by Robert Vidéki, Doronicum Kft., Bugwood.org
Hydrilla
COMMON NAME:
HydrillaSCIENTIFIC NAME:
Hydrilla verticillataORIGIN:
AsiaDESCRIPTION:
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 mid-rib 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.MANAGEMENT:
A variety of techniques have been used in the United States to manage hydrilla, including mechanical removal, physical habitat manipulation, herbicides and biological agents. Prevention is the most effective control.
WNY PRISM PRIORITY:
Tier 2 - Eradication
ADDITIONAL RESOURCES:
Native Alternatives
Southern naiad (Najas guadalupensis)
American elodea/waterweed (Elodea sp.) (E. canadensis, E. nuttallii)
Chara/muskgrass (Chara vulgaris)
NYS Prohibited and Regulated Species - Part 575:
Hydrilla is a prohibited species in New York State - for more information on Prohibited and Regulated Species, visit http://www.dec.ny.gov/animals/99141.html.
PATHWAYS OF INVASION:
Hydrilla was introduced as an aquarium plant. It can sprout from plant fragments and is spread when plant fragments are carried between bodies of water on boats, trailers and other aquatic gear.
REGIONAL DISTRIBUTION:
MAP (via iMapInvasives):
This map shows confirmed observations (green points) submitted to the NYS Invasive Species Database. Absence of data does not necessarily mean absence of the species at that site, but that it has not been reported there. For more information, please visit iMapInvasives.