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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

A database of aquatic weeds and biocontrol in South Africa after 6 years of national surveys: a tool for researchers and managers of South African water bodies.

A database of aquatic weeds and biocontrol in South Africa after 6 years of national surveys: a tool for researchers and managers of South African water bodies.
Matthew C. Parkinson
Department of Zoology and Entomology, Rhodes University, Grahamstown, 6140, South Africa.

The  database  is  primarily  the  compilation  of  data  from  6  years  (since  2008)  of  field  surveys conducted by the Biological Control Unit of the Rhodes University Department of Zoology and Entomology, funded by Working for Water. Currently the database holds over 900 sites and over 1 500 individual records, with each of the major weeds at a site during a given year making up one record. The survey focusses on the 5 floating aquatic weeds: red water fern, Azolla, Kariba weed, Salvinia molesta, water hyacinth, Eichhornia crassipes, parrot’s feather, Myriophyllum aquaticum and water lettuce, Pistia stratiotes. Data collected during these national fieldtrips pertain to the species present at a site, the extent of the cover of the water body by each species, the presence of biological control agents and an assessment of general plant health and damage caused by the biological control agents that were present. Digital photographs were also taken at most of the sites that were visited. The data are useful firstly in documenting where the different weeds occur within the country and the extent to which biological control has been implemented in different regions, and secondly contribute towards the long-term monitoring and assessment of management strategies that have been implemented for various water bodies. The data, which is freely available to any person upon request, will allow managers to adopt an adaptive management approach, whereby the efficacy of different strategies can be assessed and modified as and when necessary. Parrot’s feather, and its control agent Lysathi sp., is presented as a case study.

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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

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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

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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