Preventative measures: New Zealand and the US states of Washington, Maine, New Hampshire, Connecticut, Vermont, South Carolina, Canada are also attempting to use regulations to control the invasive.
Integrated management: According to DECFW, VANR, and TNCV (1998), “little information is available on the control of N. peltata. Based on the plant’s characteristics, mechanical and hand removal would most likely be effective. It is not known whether biological or chemical controls are effective on N. peltata. According to WSDE (2003), “N. peltata has a similar growth habit to the fragrant waterlily and it is expected that methods used to manage waterlilies would also be effective on yellow floating heart. Waterlilies (and yellow floating heart) can be controlled by cutting, harvesting, covering with bottom barrier materials, and aquatic herbicides (Rodeo®). Grass carp do not eat waterlilies in Washington and it is not known if they would readily eat N. peltata.” According to NWCB (2003), “New Zealand information suggests that hand clearing is possible with small infestations and herbicides need to be used for larger infestations.”
Location Specific Management Information
1. Alien Plants in Ireland, 2007. Nymphoides peltata
Summary: The database of alien plants in Ireland contains detailed information on 715 alien plant taxa currently occurring in (semi-) natural habitats in Ireland (both the Republic and Northern-Ireland). This database was developed in 2006 at the School of Natural Sciences, Trinity College Dublin, as part of the BioChange project, funded by the Environmental Protection Agency (EPA), Ireland.
Available from: http://www.biochange.ie/alienplants/index.php [Accessed April 26 2007]
This page available from: http://www.biochange.ie/alienplants/result_species.php?species=628&volg=i&lang=latin&p=i [Accessed 26 April 2007]
4. Champion, P.D.; Clayton, J.S. 2001. Border control for potential aquatic weeds. Stage 2. Weed risk assessment. Science for Conservation 185. 30 p.
Summary: This report is the second stage in the development of a Border Control Programme for aquatic plants that have the potential to become ecological weeds in New Zealand. Importers and traders in aquatic plants were surveyed to identify the plant species known or likely to be present in New Zealand. The Aquatic Plant Weed Risk Assessment Model was used to help assess the level of risk posed by these species. The report presents evidence of the various entry pathways and considers the impact that new invasive aquatic weed species may have on vulnerable native aquatic species and communities.
Available from: http://www.doc.govt.nz/upload/documents/science-and-technical/SFC185.pdf [Accessed 13 June 2007]
5. National Pest Plant Accord, 2001. Biosecurity New Zealand.
Summary: The National Pest Plant Accord is a cooperative agreement between regional councils and government departments with biosecurity responsibilities. Under the accord, regional councils will undertake surveillance to prevent the commercial sale and/or distribution of an agreed list of pest plants.
Available from: http://www.biosecurity.govt.nz/pests-diseases/plants/accord.htm [Accessed 11 August 2005]
6. New Zealand Plant Conservation Network, 2005. Unwanted Organisms. Factsheet Nymphoides peltata
7. Paillisson, J.-M., Marion, L., 2002. Functions and management of floating vegetation in an eutrophic lake ecosystem: assessment after two decades. In: Conservatoire du Patrimoine Naturel de Savoie (Ed.), European Symposium of Management and Conservation of Lake Littoral Vegetation. Conservatoire du Patrimoine Naturel de Savoie, Le Bourget-du-Lac, pp. 179-192.
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