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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

Towards understanding field performance of introduced insect agents on Parthenium hysterophorus in South Africa

Towards understanding field performance of introduced insect agents on Parthenium hysterophorus in South Africa
Lorraine W. STRATHIE, Frank Chidawanyika, Sakhi Sambo, Milly Gareeb
Agricultural Research Council – Plant Protection Research Institute, Private Bag X6006, Hilton 3245, South Africa 

Successful management of Parthenium hysterophorus (Asteraceae; known as parthenium or famine weed) in various invaded environments requires a suite of natural enemies. Each agent has unique attributes and limitations that contribute to levels of success that may be achieved. In recent years, three imported insect agents (Listronotus setosipennis (Coleoptera: Curculionidae), Zygogramma bicolorata (Coleoptera: Chrysomelidae) and Smicronyx lutulentus (Coleoptera: Curculionidae)) have been introduced into multiple sites within subtropical regions of South Africa that are severely invaded by parthenium. Highly variable establishment and field performance is apparent, likely due to a combination of intrinsic and external factors. Despite several desirable biological characteristics and reasonable field establishment of the endophagous stem-boring weevil L. setosipennis, distribution is localised. Field evidence of temperatures that reach critical or lethal limits, together with demonstrated variability in the thermal tolerance of the defoliating beetle Z. bicolorata of different ages, feeding status and thermal pre-treatments under laboratory conditions, suggest some causative influences on its field establishment. Resultant implications for improved biological control of parthenium, and the need for additional complementary agents that can address local limiting factors, are discussed.

Read 2785 times Last modified on Tuesday, 03 May 2016 12:16

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