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Glyceria maxima (aquatic plant, grass)   |
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Management Information
Chemical: Noble (2002) list Roundup Biactive or Weedmaster 360 as the permitted herbicide to use against G. maxima, the recommended technique is Foliar spray. The authors advise not to add surfactants. Clearance or drainage of growth area combined with dense revegetation with local native species is suggested for long-term results through stream shading. The authors warn of taking care Take extreme caution not to spread Glyceria seed through soil transport (e.g. on machinery).  
Location Specific Management InformationWaikato Region (North Island)
G. maxima (known as reed sweet grass) is classified as a “Nuisance Plant Pest” by Environment Waikato, which means it has been established for a considerable time and is probably widespread. While Region-wide control would be impractical and costly, there is benefit to those who wish to control specific infestations.
Please see definitions for hierarchy of pest designations. Whangamarino Wetland
The Department of Conservation’s management plan for Whangamarino seeks to control amongst other threats, that caused by G. maxima around the margins.
Management Resources/Links
3. 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] 4. D’Antonio, C.M & Vitousek, P.M., 1992. Biological Invasions by exotic grasses, the grass/fire cycle, and global change. Annu. Rev. Ecol. Syst. 1992.23.’63-87 8. Noble, Michael, 2002 . Guidelines for Herbicide Use Near Water. Rivercare Guidelines #1 Miller, J (Ed). Department of Primary Industries, Water and Environment, (DPIWE) Tasmania Results Page: 1
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