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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

Robinia pseudoacacia, (Black locust) the problem and available solutions

Robinia pseudoacacia, (Black locust) the problem and available solutions
Grant Martin
Rhodes University

Robinia pseudoacacia L. (Fabaceae) is a deciduous tree indigenous to North America that was probably introduced into South Africa via the horticultural industry. Having already established in all nine provinces, it is regarded as one of our most difficult invaders to control as it suckers profusely and readily produces copious numbers of seed. Not only is it a prolific water user, capable of invading pristine environments, but it is also poisonous to both humans and animals. Thorny, dense thickets and difficult-to-navigate mountain terrain make mechanical and chemical control options inadvisable. The aim of the study is to investigate possible biological control options for the management of the tree. In its indigenous range the natural enemies of R. pseudoacacia are well studied and include a variety  of  insects  and  pathogens.  Three  of  these  insects  have  already  established  on  R. pseudoacacia populations in Europe and have proved to be damaging, they include a gracillariid leaf- mining moth, Phyllonorycter robiniella, a cecidomyiid gall midge, Obolodiplosis robiniae (Haldeman) and the locust borer, Megacyllene robiniae forster (Cerambycidae).The locust borer is only known to attack R. pseudoacacia and its cultivars and appears to be the most damaging and promising agent for biological control. Biological control success in other countries, the absence of indigenous Robinia species in South Africa, availability of biological control agents and value to primary industry and horticulture suggest that biological control should be considered for the control of R. pseudoacacia

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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