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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

Investigating two different mechanical control options for naturalised population of Hydrocleys nymphoides in South Africa

Investigating two different mechanical control options for naturalised population of Hydrocleys nymphoides in South Africa 
Menzi Nxumalo, Reshnee Lalla
Invasive Species Programme, SANBI

Hydrocleys nymphoides, an aquatic plant native to South America, has demonstrated invasiveness in several countries. In South Africa, its distribution is limited to one naturalized population, recently detected in a dam in the KwaZulu-Natal Midlands region. Plants were observed growing mostly along the edges of the dam, occupying about 30% of this 23 400 m2  water body. Due to the multiple domestic and agricultural uses of the dam, the use of herbicides as a control option was not feasible and other control methods had to be investigated. This study aimed to compare two different mechanical control options that are recommended for aquatic systems used for domestic purposes. The first entails physically removing all parts of the plants using an aquatic rake, and the second is a plant shading method in which target plants are covered with black plastic that provides 100% shade cover. Here we report on the experimental set up and provide detailed information on the pros and cons of both control options. This study aims to reduce the current infestation size of H. nymphoides, prevent spread to other water bodies, and inform broader management options for this species and other similar aquatic invasive alien plants in South Africa.

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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