Hydrilla Resource Library

This collection of resources on hydrilla links to key information such as webinars, press releases and documents on aquatic plant management. Links to many of the items can also be found in context on the other hydrilla webpages. Some file sizes are quite large and large file sizes are usually noted.

Hydrilla Identification

• Hydrilla, Brazillian Elodea and Native Elodea ID sheet, from NYSDEC
• Hydrilla update with native look-alikes, adapted from Invasive Weed Identification Guide by Cayuga Lake Watershed Network
• Invasive Weed ID Guide (947kb PDF) A guide to distinquishing aquatic invasive weeds from their native, beneficial look-alikes (includes hydrilla).

General Resources

• Ecology and Management of Invasive Plants Program: Hydrilla has extensive data about hydrilla including the economic and ecological damage, geological distribution and origin, taxonomy, biocontrols, and much more.
• New York State Department of Environmental Conservation hydrilla factsheet 
• Monoecious Hydrilla - A Review of the Literature provides a comprehensive overview of published research done on monoecious hydrilla, which is the biotype found in New York. The Appendix includes the abstracts from each article cited in the paper. The source of the review is the New York Invasive Species Information.

• Hydrilla Hunt Webinar (7/16/2013), featuring Scott Kishbaugh (NYSDEC), Bob Johnson (Racine-Johnson Aquatic Ecologists), Greg Sargis (The Nature Conservancy), and Meg Wilkinson (Natural Heritage Program). Topics include how to identify hydrilla, how to survey for hydrilla, and how to report findings of hydrilla. View supporting materials for this webinar such as: hydrilla identification tips, hydrilla surveying form, description of rake toss method, webinar presentation charts, additional charts and information, and iMap training.
• Hydrilla Growth Rate, in 'Use of Herbicides for Control of Submersed Vegetation,' a PowerPoint presentation by Michael D. Netherland, Ph.D, US Army ERDC, Gainesville, FL
• Does Hydrilla Grow an Inch Per Day? Measuring short-term changes in shoot length to describe invasive potential, Glomski, L.A. and M.D. Netherland. 2011. Journal of Aquatic Plant Management
• Hydrilla linked to eagle deaths via bluegreen algae toxicity (618 kb pdf). Research by Warnell School of Forestry and Natural Resources.
• Hydrilla, Brazillian Elodea and Native Elodea ID sheet, from NYSDEC
• Hydrilla update with native look-alikes, adapted from Invasive Weed Identification Guide by Cayuga Lake Watershed Network
• Roles of Boating Facilities, Bait Dealers, and Angler and Boating Organizations in Preventing the Spread of Aquatic Invasice Species in the Lake Ontario Basin by the Human Dimensions Research Unit of Cornell University.
• Travels with Hydrilla: The Unnatural History of an Accidental Invader by Michael W. Fincham, The Chesapeake Quarterly/Maryland Sea Grant. Details the introduction of hydrilla to the U.S. and its rapid spread.
• Invasive Weed ID Guide (947kb PDF) A guide to distinquishing aquatic invasive weeds from their native, beneficial look-alikes (includes hydrilla).
• The International Plant Protection Convention's Aquatic Plants Their Uses and Risks highlights hydrilla (page 41), its impacts (page 55) and recommendations for dealing with pest species ( page 60).
• Cornell Cooperative Extension Statewide Invasive Species Outreach Program & NY Invasive Species Clearinghouse focuses on increasing the involvement of CCE Associations with statewide invasive species programming. This webinar introduces/re-introduces you to the CCE IS team and resources for programming.  
• 2014 Croton River System Hydrilla/SAV Delineation Report  analyzes and explains the findings and current conditions of hydrilla in the Croton River. 
• 2014 Hydrilla Integrated Management on Florida's dioecious hydrilla. 

General Aquatic Weed Management Resources

• A Field Guide to Aquatic Macrophyte Species Found in New York Lakes along with Potential Non-Native (Exotic) Invaders (6588kb PDF), Johnson, B.L. 2013.
• Aquatic Weeds: Nuisance and Necessary- Managing Waterweeds in Cayuga, Owasco and Seneca Lakes, 2006 by the Cayuga Lake Watershed Network
• Invasive Weed ID Guide text (947kb PDF) A guide to distinquishing aquatic invasive weeds from their native, beneficial look-alikes.
• Online version of Diet for a Small Lake by NYS Federation of Lake Associations

Last updated July 26, 2019