Study

Controlling New Zealand pygmyweed Crassula helmsii in field ditches and a gravel pit by herbicide spraying at Dungeness RSPB Reserve, Kent, England

  • Published source details Gomes B. (2005) Controlling New Zealand pygmyweed Crassula helmsii in field ditches and a gravel pit by herbicide spraying at Dungeness RSPB Reserve, Kent, England. Conservation Evidence, 2, 62-62.

Actions

This study is summarised as evidence for the following.

Action Category

Crassula helmsii: Chemical control using herbicides

Action Link
Control of Freshwater Invasive Species
  1. Crassula helmsii: Chemical control using herbicides

    A before-and-after study in 2001-2004 at waterbodies in a nature reserve in Kent, UK (Gomes 2005) reported that application of either diquat-based herbicide or glyphosate killed most C. helmsii plants, although no statistical tests were carried out. Spraying once, using diquat on field ditches and glyphosate on the margin of a gravel pit, killed 70% of C. helmsii. A second application of diquat the following year was recorded as being ‘partially successful’ (no data given). However the authors reported that re-growth of C. helmsii was ‘noticed annually’ at sites treated with both chemicals. The diquat-based chemical Reglone was sprayed onto 50 m2 ditch at a rate of 10 l for 300 m in August-September 2001 and 2002. Glyphosate was applied at an unknown concentration in August-September 2004.

     

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 21

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust