Video identification of Curly leaved Waterweed

Video identification of Curly leaved Waterweed

Play to see identifying features of invasive Lagarosiphon major and comparisons with two...

Rapid invasion of Lough Corrib

Rapid invasion of Lough Corrib

Rapid invasion of Lough Corrib Currently, in Ireland, we are at an early stage in the...

Adverse Impacts

Adverse Impacts

Rinerroon Bay as viewed from a boat (left) pre-Lagarosiphon major infestation (right) in 2005...

Management and control

Management and control

Management and control An expert group, with international experience in aquatic weed...

Life cycle studies

Life cycle studies

(a) Canopy-forming growth in winter (b) collapsed condition in summer Life cycle...

Mechanical cutting and harvesting

Mechanical cutting and harvesting

Mechanical cutting and harvesting (a) OSMA Weed cutting boat (b) v-blades (trailing knives)...

Light Exclusion using Biodegradable Geotextile

Light Exclusion using Biodegradable Geotextile

Light Exclusion using Biodegradable Geotextile Jute matting or hessian has been recently employed...

  • Video identification of Curly leaved Waterweed

    Video identification of Curly leaved Waterweed

    Wednesday, 17 August 2011 15:10
  • Rapid invasion of Lough Corrib

    Rapid invasion of Lough Corrib

    Wednesday, 17 August 2011 15:12
  • Adverse Impacts

    Adverse Impacts

    Wednesday, 17 August 2011 15:19
  • Management and control

    Management and control

    Thursday, 18 August 2011 09:49
  • Life cycle studies

    Life cycle studies

    Tuesday, 23 August 2011 13:24
  • Mechanical cutting and harvesting

    Mechanical cutting and harvesting

    Tuesday, 23 August 2011 13:38
  • Light Exclusion using Biodegradable Geotextile

    Light Exclusion using Biodegradable Geotextile

    Tuesday, 23 August 2011 14:25

Lagarosiphon

Curly leaved waterweed

(Lagarosiphon major)

Lagarosiphon major is an aggressive, non-native, invasive plant species that originated in southern Africa, where it is regarded as a nuisance weed.  The plant can grow in water up to 6m deep.

Lagarosiphon major

In addition to occupying the full water column, plant stands produce dense canopy vegetation on the water surface.  The leaves are strongly recurved and are borne in a spiral arangement.  The long stem is brittle and easily broken (aiding dispersal).  Only female plants are present and all reproduction is by fragmentation or vegetative reproduction.  Detached stems, when they sink, root from the nodes and establish new populations.