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German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

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Environmental Programmes

In order to tackle our country’s socio-economic challenges, the government adopted the Outcomes based approach to improve government performance and providing focus on service delivery. find out more

Management of the invasive cord grass, Spartina alterniflora, in the Groot Brak Estuary: challenges and progress

Management of the invasive cord grass,  Spartina alterniflora, in  the Groot Brak Estuary: challenges and progress 
Ernita van Wyk1, David G. Harding2, Virgil Jacobs1, Nolwethu Jubase1, Janine Adams3, Taryn Riddin
1Invasive Species Programme, SANBI; 2Invader Plant Specialists; 3Department of Botany, Nelson Mandela Metropolitan University

Spartina alterniflora is an invasive cord grass native to the Atlantic and Gulf Coasts of North America. The species is adapted to living in salt marshes and estuaries and was found growing in the Groot Brak estuary between Mossel Bay and George in 2004. Research shows that, if left unmanaged, the population in the Groot Brak estuary can spread at a rate 0.162 ha per year, with the possibility of covering 41% of the total vlei area. Currently, the plant occupies less than one hectare of the intertidal marsh. Experiences from Washington State (USA) suggest that small populations of this species can be eradicated. Despite the potential for eradication in the Groot Brak estuary, management of the species in a seasonally open-closed estuary is challenging as natural estuarine conditions create limited windows of opportunity for access and treatment. Foliar herbicide application has proved to be the most effective treatment on S. alterniflora in the Groot Brak system. Following on initial research done on this population by the Nelson Mandela Metropolitan University (NMMU), we set out to discover whether we can control or even eradicate the Groot Brak population. We present preliminary results based on herbicide treatments and on-site population monitoring conducted between 2009 and May 2014. In addition, we present results from an aerial photography exercise applied to this S. alterniflora population to demonstrate the potential value of this method as a monitoring tool.

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General News Updates

2019 National Symposium on Biological Invasio…

26-02-2019

This is your invitation to South Africa's 2019 National Symposium on Biological Invasions. The convention is hosted by the Centre for Invasion Biology (CIB), University of Stellenbosch, and the Biolo... Read more

2019 Invasive Species Training

22-01-2019

During the past five years (2014-2018), ISSA invasive species trainers have trained 4 000 in the identification of invasive species and laws pertaining to invasive species across South Africa.  ... Read more

Alien Grass Working Group

04-09-2018

Who are we? The South African National Alien Grass Working Group was jointly initiated by the South African Biodiversity Institute (SANBI) and the Centre for Excellence in Invasion Biology (C·I·B) in... Read more

Permits for planting indigenous Cynodon?

01-03-2018

On 16 February, 2018, South Africa's Department of Environmental Affairs issued amendments to the regulations and lists relating to the National List of Invasive Species.  Updates to the draft&n... Read more

Invasive species training 2018 dates released

28-02-2018

Interested in invasive species?  How much do you know about NEMBA invasive species compliance for landowners and organs of state? The South African Green Industries Council (SAGIC) have released... Read more

Communications post for Africa advertised

25-01-2018

The Nature Conservancy has advertised a brand new post:  Communications Manager, Africa Region. Knowledge of invasive species and water would be an asset in this post. See details below:    Job Titl... Read more