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Water ChestnutDescriptionWater Chestnut is a rooted, aquatic plant with both floating and submersed leaves. The floating leaves form a rosette and are green, glossy and triangular with toothed edges. The submersed leaves are feathery, and are found whorled around the stem. Plant stems are cord-like and can attain lengths of up to 16 feet. Water chestnut is an annual plant, overwintering entirely by seed. In July the plant begins to produce seeds (called nuts) with 4 sharp spines. Mature seeds are green to greenish brown and sink to the bottom. Seeds may remain alive in the sediment for up to 12 years! Floating black nuts will not sprout. (Please note: this plant species is not the same as the “water chestnut” used in Asian cooking.) HabitatShallow (< 16 ft) areas of freshwater lakes and ponds, and slow-moving streams and rivers. DistributionWater chestnut’s native range is Europe, Asia and Africa. Since its introduction into North America in 1877, it has become a nuisance species because of its ability to reproduce rapidly and form dense floating mats. Water chestnut is presently found in Massachusetts, Vermont, Connecticut, New York, Pennsylvania, Maryland and Virginia. Within the Connecticut River watershed, water chestnut is found in Massachusetts and Connecticut in a few coves, ponds and an impoundment. The seeds, or severed plant parts carrying seeds, may drift downstream. Ducks and geese may also be responsible for the plants dispersal. Canada geese have been seen with the spiny nuts attached to their feathers. ControlEarly detection is the key to control since smaller populations are easier to eliminate than larger ones. It also costs less to control a small infestation because plants can be individually hand-pulled. Large populations require the use of mechanical harvesters or application of aquatic herbicides to achieve control. Infested waters must be treated for 5-12 years to eliminate the invading population. However, some infestations are so extensive (e.g. >300 acres in Lake Champlain) that complete eradication may never be achieved. Many states, including Massachusetts, New Hampshire, South Carolina, Florida, New York and Arizona, have adopted laws to prohibit the intentional distribution of this aggressive plant. View the water chestnut profile at www.invasivespecies.gov. 2007 AccomplishmentsWater chestnut management takes several forms in the Connecticut River basin. The first objective is to prevent or minimize new infestations through increased monitoring and surveys. The second is to control the spread of existing infestations by removing the plants when they are discovered and periodically thereafter until the population is eliminated. The last is to increase public awareness as the first line of defense against the spread of these exotic plants. Water Chestnut Management – RemovalNine-staff days were provided to assist the Silvio O. Conte National Fish and Wildlife Refuge staff in removal of water chestnut at locations including: Cove Island Cove in South Hadley, MA (1,050 lbs), lower Hockanum River in East Hartford, CT (900 lbs), Chicopee River in Holyoke, MA (1,800 lbs), Ashley and Whiting Street Reservoirs in Holyoke, MA (600 lbs), Vinton Mill Pond in CT (600 lbs), Easthampton Ponds in MA (45 lbs), Meadowbrook in CT (440 lbs), and Windsor Canal in CT (300 lbs). Partners assisting in the effort included many volunteers. Water Chestnut Management – EducationThe Silvio O. Conte National Fish and Wildlife Service fact sheet, Water Chestnut: take it out before it takes over!, was distributed via the Internet as part of the educational materials provided to classrooms involved in the Connecticut River basin salmon-in-the-schools programs. Once again over 100 schools received the fact sheet in Connecticut, Massachusetts, New Hampshire and Vermont. 2006 AccomplishmentsWater Chestnut Management – RemovalSeasonal staff and interns provided 18 staff days to assist staff from the Silvio O. Conte National Fish and Wildlife Refuge in removing 7.2 tons of water chestnut from the watershed including 4 tons from the Chicopee River and 2.6 tons from Big E Pond in Springfield, MA. Other collection sites included Cove Island Cove and Hadley Cove in South Hadley, MA, Route 5 Oxbow in Holyoke, MA, the upper and lower ponds at Mount Holyoke College in South Hadley, MA, Fannie Stebbins Wildlife Preserve in Longmeadow, MA, Barton Cove in Gill, MA, Hockanum River in East Hartford, CT and Van Horn Park in Springfield, MA. Water Chestnut Management – EducationThe Silvio O. Conte National Fish and Wildlife Service fact sheet, Water Chestnut: take it out before it takes over!, was distributed via the Internet as part of the educational materials provided to classrooms involved in the Connecticut River basin salmon-in-the-schools programs. Once again over 100 schools received the fact sheet in Connecticut, Massachusetts, New Hampshire and Vermont. 2005 AccomplishmentsWater Chestnut Management - Removal
Water Chestnut Management – EducationThe Silvio O. Conte National Fish and Wildlife Service fact sheet, Water Chestnut: take it out before it takes over!, was distributed via the Internet as part of the educational materials provided to classrooms involved in the Connecticut River basin salmon-in-the-schools programs. Over 100 schools received the fact sheet in Connecticut, Massachusetts, New Hampshire and Vermont. The same information, along with water chestnut pulling opportunities for volunteers, was distributed to participants at the Westfield River Watershed Association Westfield River Symposium in April and the Herrick’s Cove Wildlife Festival in May. 2004 AccomplishmentsWater Chestnut Management - Surveys
Water Chestnut Management - Removal
Water Chestnut Management – EducationThe Silvio O. Conte National Fish and Wildlife Service fact sheet, Water Chestnut: take it out before it takes over!, was distributed in February as part of the educational materials provided to classrooms involved in the Connecticut River basin salmon-in-the-schools programs. Over 100 schools received the fact sheet in Connecticut, Massachusetts, New Hampshire and Vermont. The same information, along with water chestnut pulling opportunities for volunteers, was distributed to participants at the Westfield River Watershed Association Westfield River Symposium in March. DownloadsYou will need Adobe Acrobat Reader software to open some of the documents below. If you do not have this software, you may obtain it free of charge by following this link.
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