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Light Exclusion using Biodegradable GeotextileLight Exclusion using Biodegradable Geotextile Jute matting or hessian has been recently employed a... 
Mechanical cutting and harvestingMechanical cutting and harvesting (a) OSMA Weed cutting boat (b) v-blades (trailing knives) fitte... 
Life cycle studies(a) Canopy-forming growth in winter (b) collapsed condition in summer Life cycle studies Lagarosip... 
Management and controlManagement and control An expert group, with international experience in aquatic weed management,... 
Adverse ImpactsRinerroon Bay as viewed from a boat (left) pre-Lagarosiphon major infestation (right) in 2005 post- ... 
Rapid invasion of Lough CorribRapid invasion of Lough Corrib Currently, in Ireland, we are at an early stage in the Lagarosipho... 
Video identification of Curly leaved WaterweedPlay to see identifying features of invasive Lagarosiphon major and comparisons with two related ...
LagarosiphonCurly 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.
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. Origin and habitatThe weed will grow in lakes, rivers, streams, canals and ponds. It’s preferred habitat is still water between 1.5 and 4m deep. This aggressive weed is sold by garden centres as an oxygenating plant for use in garden ponds or in aqauria. It is spread by fragmentation. The stem fregments are dispersed by the wind, by boat movement, angling equipment and, possibly, birds.
Video identificationIdentification of Three Closely Related Aquatic Plant SpeciesIdentification of Three Closely Related Aquatic Plant Species: Curly leaved Waterweed (Lagarosiphon major), Nuttall's Pondweed (Elodea nuttallii) and Canadian Pondweed (Elodea canadensis) by Dr. Joe Caffrey, Inland Fisheries Ireland |
