Providing evidence to improve practice

Action: Water primrose: Physical removal Control of Freshwater Invasive Species

Key messages

  • A study in the USA found that hand pulling and raking water primrose failed to reduce its abundance, whereas hand-pulling from the margins of a pond eradicated a smaller population of water primrose.

Supporting evidence from individual studies

1 

A study in 2005 in a managed wetland in the Laguna de Santa Rosa, California, USA (Sears et al. 2006) found that hand pulling and raking water primrose Ludwigia sp. failed to reduce its abundance, whereas hand-pulling from the margins of a pond in the Laguna Wetland Preserve Sebastopol successfully eradicated a smaller population of water primrose.  Attempts to reduce the coverage of primrose in the Laguna de Santa Rosa, California, were wholly unsuccessful and by the end of the season water primrose covered 100% of the pond.  Hand pulling and raking were carried out for 2-6 person hours/week.  Workers in the Laguna Wetland Preserve at Sebastopol spent approximately 150 person hours of effort hand-pulling water primrose from pond margins.

Referenced papers

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