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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

Biological control of Australian acacias: what you see is not what you get

Biological control of Australian acacias: what you see is not what you get
John H. Hoffmann1, Fiona A.C. Impson1,2 & Carien A. Kleinjan1
1Department of Biological Sciences, University of Cape Town, Rondebosch 7700, South Africa.
2ARC-Plant Protection Research Institute, P. Bag X5017, Stellenbosch 7600, South Africa. 

Biological control is being used against 13 species of invasive Australian acacias in South Africa with agents comprising two gall midges (Cecidomyiidae), two gall wasps (Pteromalidae), several seed beetles (Curculionidae) and a rust fungus (Basidiomycetes).  The fungus is the only agent that damages the whole plant.  The insects are all associated with the flowers and seeds on the plants.  It is 40 years since the first agent was released, the bud gall wasp Trichilogaster acaciaelongifoliae on Acacia longifolia.  The question is what has happened in the interim and have we achieved anything worthwhile with the flower and seed-feeding insects.  An overview of historic and recent events is used to show that, while the record is regrettably incomplete, there is enough evidence to show that the investment in biological control has been very worthwhile and will provide increasing benefits into the future.

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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