Chemical control of Australian swamp stonecrop (New Zealand pygmy weed) Crassula helmsii

Published source details Anon . (2004) Chemical control of Australian swamp stonecrop (New Zealand pygmy weed) Crassula helmsii. The National Trust Conservation Newsletter, 8, 2-3.
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This study is summarised as evidence for the following.

	Action	Category
	Crassula helmsii: Use a combination of control measures Action Link
	Crassula helmsii: Use lightproof barriers to control plants Action Link
	Crassula helmsii: Chemical control using herbicides Action Link

Crassula helmsii: Use a combination of control measures

A before-and-after study in 2002-2003 at a single pond in Surrey, UK (Anonymous 2004) reported that covering C. helmsii with carpet strips followed by the application of glyphosate reduced the area of the plant, although no statistical tests were carried out. One year after glyphosate application approximately 80% of C. helmsii had been killed. In autumn 2002, strips of carpet were placed over C. helmsii and weighted down wherever possible on the pond edge and in shallow water. In July-August 2003 the carpet was removed and the glyphosate-based herbicide Roundup was applied twice.
Crassula helmsii: Use lightproof barriers to control plants

A before-and-after study in 2002-2004 at a single pond in Surrey, UK (Anonymous 2004) reported that covering C. helmsii with carpet strips followed by the application of glyphosate reduced the area of the plant, although no statistical tests were carried out. One year after glyphosate treatment approximately 80% of C. helmsii had been killed, although it is not clear whether this was a direct result of the use of carpet or was due to herbicide application. In autumn 2002, strips of carpet were placed over C. helmsii and weighted down wherever possible on the pond edge and in shallow water. In July-August 2003 the carpet was removed and the glyphosate-based herbicide Roundup was applied twice.
Crassula helmsii: Chemical control using herbicides

A before-and-after study in 2002-2003 at a single pond in Surrey, UK (Anonymous 2004) reported that covering plants with carpet strips and then applying glyphosate reduced the area of C. helmsii, although no statistical tests were carried out. Approximately 80% of C. helmsii was killed, although it is not clear whether this was a result of herbicide application or was due to the use of carpet to prevent light reaching the plant. In autumn 2002, strips of carpet were placed over C. helmsii wherever possible on the pond edge and in shallow water. In July-August 2003 the carpet was removed and the glyphosate-based herbicide Roundup was applied twice (concentration not given). C. helmsii cover was assessed in June 2004.