How to get rid of Crassula helmsii?

Mechanical control could be used to remove Crassula helmsii from affected waterways, either by removing vegetation using mechanical or manual methods, or by dredging entire waterbodies. This approach may reduce the dominance of the plant, but is often not fully effective.

How do you kill Crassula?

One of the most effective ways to knock back Crassula appears to be applying herbicides, particularly glyphosate and diquat or diquat alginate.

How do you get rid of NZ Pygmyweed?

Chemical: control using glyphosate herbicides are the only option. It is applied to the emergent material on the bank or in the water as long as it is dry. Treatment is carried out from April to the end of Nov when the majority of the plant is emergent.

What kind of herbicide to spray for Crassula helmsii?

A small, controlled, before-and-after trial in 1992 in two lakes in West Sussex, UK (Child & Spencer-Jones 1995) found that spraying C. helmsii with glyphosate reduced plant height and cover, but dichlobenil and diquat had no effect (although no statistical tests were carried out).

When did Dawson f.h.write Crassula helmsii?

Dawson F.H. (1996) Crassula helmsii : attempts at elimination using herbicides. Hydrobiologia, 340, 241-245

How did Crassula helmsii spread to new locations?

The trade and potential escape of C. helmsii through the aquarium and water garden industry may play a large role in its spread to new locations. In addition, the transportation of this plant on recreational equipment or by wildlife moving between water bodies may also play a role in local spread.

Is the Crassula helmsii a noxious weed in Florida?

C. helmsii is declared a noxious weed in Florida and North Carolina, and although some sources report C. helmsii as occurring in these states (OEPP/ EPPO, 2004; 2006), the status of these populations is unknown.