Location Specific Management Information
In lakes, where stands impair boat navigation, upper parts are sometimes "mowed“ by special boats (Wolfer, pers. Communication., 2005)
Champion and Clayton (2001) Aquatic Plant Weed Risk Assessment Model classifies P. perfoliatus as a high risk species in New Zealand. It is classified as NASSn (species or genus banned from import according to MAF NASS Standards for importation of seed, or nursery stock (1976-94)). It is however not naturalised in New Zealand (Champion and Clayton, 2000).
P. perfoliatus was first reported in an ornamental pond near Queenstown and was traced back to nurseries in Christchurch and Queensland. The plant has since been banned from sale and distribution. All plant material was destroyed from the three sites (Champion and Clayton, 2000).
The plant spreads by seed dispersed by waterfowl. One way to distinguish it from native pondweeds are the way the leaves wrap themselves round the stem, a feature not found in native pondweeds.
P. perfoliatus is included in the First Schedule of the National Pest Plant Accord. All plants on the list are designated as Unwanted Organisms, and are banned from sale, propagation and distribution throughout New
Zealand. Please see National Pest Plant Accord for the complete list.
Otago Region (South Island)
P. perfoliatus was reported on a site near Lake Hayes in Otago. It was eradicated from this site.
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]
6. 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]
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