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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

Do biological control agents actually work in a natural environment?

Do biological control agents actually work in a natural environment?
Roy W. Jones
Ezemvelo KZN Wildlife; Rhodes University

Water hyacinth, Eichhornia crassipes, was first recorded on the Nseleni River in KwaZulu-Natal in 1978 and has been shown to have a significant negative impact on the biodiversity of the Nseleni River. An effective and sustainable control intervention was therefore urgently required. Although biological control using the two weevil species Neochetina eichhornia and N. bruchi has been credited with affecting a good level of control in South Africa in terms of pre- and post-release evaluation, the lack of a post-release evaluation data has undermined this statement. In a manipulated post-release evaluation experiment on the Nseleni River five experimental plots of water hyacinth of 20 m2  were sprayed with an insecticide (Actara SC) to control weevils. After ten months the plants in the sprayed plots were significantly bigger and heavier than those in the unsprayed control plots that had natural populations of the weevil biological control agents. This study has shown unequivocally that biological control has contributed significantly to the control of water hyacinth on the Nseleni River.

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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