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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

Estimates Of Impacts On Waterflows

David Le Maitre-National Resources and the Environment, CSIR

The new assessment of the impacts of invasive alien plants on the water in South Africa based on the mapping done by Kotze on 2010. The approach took into account basic hydrological principles and factors which limit plant water use and accumulated information on water use by these species in both plantation settings and those typically invaded since the publication of the previous national assessment in 1998.

The taxon with the greatest impacts was the wattles, (Acacia mearnsii) which account for 33.5% of the total reductions followed by Pinus species 18.9% and Eucalyptus 15.1%.

The unit area flow reductions due to pines were 212.1 mm followed by Hakea species (199.5 mm/yr) largely because they occur mainly in high yielding montane fynbos catchments.There are also extensive riparian invasive by eucalyptus, wattles and other species along perennial rivers in semi-arid and arid environment (e.g. Middle and lower
Orange River, low Vaal River) whose impacts have not been included in this assessment.

Prosopis invasions in the Northern Cape result in the further reduction of about 8.94 million a year. There are extensions of Prosopis species in the North West, Free State and Western Cape Provinces which have not been adequately mapped so their impacts cannot be quantified. Wattles (Acacia mearnsii)

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General News Updates

2019 National Symposium on Biological Invasio…


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


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


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?


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


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


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