[Invasive-species] a question about Crassula helmsii, an invasive waterplant species in Western Europe

Richard Lansdown rlansdown at ardeola.demon.co.uk
Wed Oct 17 07:44:10 CEST 2012

Dear Steven,


It is my belief that in the UK no method has been found to control this
species successfully; even in the most successful cases, control of C.
helmsii has required the eradication of all plants in a wetland.


I would be very interested to hear of successful control.

Best wishes




Richard Lansdown

Chair IUCN/SSC Freshwater Plant Specialist Group

Ardeola Environmental Services

45 The Bridle


Glos. GL5 4SQ

Tel: 01453 763348

Mob: 07802196494


From: invasive-species-bounces at biodiversity.be
[mailto:invasive-species-bounces at biodiversity.be] On Behalf Of Steven
Sent: 16 October 2012 22:33
To: invasieve soorten mailinglijst; invasive-species-owner at biodiversity.be
Subject: [Invasive-species] a question about Crassula helmsii, an invasive
waterplant species in Western Europe


Dear members of this mailing list,


I've been asked to get information about the most effective combats against
Crassula helmsii. This species is now widely scaterred in Flanders and
before that elsewhere in Western Europe.


Is there anyone between you who knows a way to fight this invasive
waterplant effectively?


I should like to know about cases in other countries than Belgium and
Flanders where methods of combats against this species are proven to be
effective and efficiënt.

Particullarly important to us is the effectiveness over the longer term.
Thus, which methods are proven to make this species disappear for a longer

Of course methods without the use of poison are of most interest. 


Answers may be send to my private email but may also be shared over this


Kind regards,


Steven Keteleer



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