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18 February 2019 | Story Leonie Bolleurs | Photo HO de Waal
Ground spiny Cactus pear
Shredded, sun-dried, and coarsely ground spiny cactus pear (Opuntia ficus-indica and O. engelmannii), ready to be included in balanced diets for ruminant livestock (cattle, sheep, goats) and wild antelopes.

Prof HO de Waal, researcher in the Department of Animal, Wildlife and Grassland Sciences at the University of the Free State (UFS), has developed a standard procedure for the processing of spiny cactus pear (Opuntia spp.) into livestock fodder. This will ultimately assist in the management of massive infestations of spiny cactus pear and help to convert underutilised farmland back to natural grazing land.

In addition to applying biological control agents, mechanical control is used to harvest alien spiny cactus pear, and the large volume of material is processed as livestock feed.

 

Introduced to South Africa

 

Three hundred years ago, seafarers visiting the Cape of Good Hope introduced the well-known invading alien spiny cactus pear to South Africa. These were later transported inland and by the 1950s about one million ha of South Africa had been invaded by the alien cacti.

Some regions in the Eastern Cape have been taken over by dense, impenetrable thickets of these cacti. Invasive alien plants (IAPs) such as cacti pose a direct threat to, among others, South Africa’s water security and productive use of land.

A range of methods is used to control IAPs, including mechanical, chemical, biological, and integrated control methods.

A control programme must include the three phases of initial control to drastically reduce the existing population; follow-up control of seedlings, root suckers, and coppice growth; and maintenance control on an annual basis to sustain low alien plant numbers.

 

Processing spiny cactus pears

 

According to Prof De Waal, the harvesting and processing of the spiny cactus pear is fairly simple. Although it requires a good measure of physical strength, perseverance, and the necessary protective clothing, the cacti can be processed by harvesting the plants; shredding the cladodes through a cladode cutter; then drying them in the sun, and lastly grinding it in a hammer mill. “The long spines are degraded mechanically by grinding the sun-dried cladode strips in a hammer mill before including it in balanced livestock diets,” said Prof De Waal.

Infestations will be opened, reclaimed, rehabilitated and the natural pastures (veld) allowed to revert back to grazing for livestock.

The National Resource Management Programme (NRM)P) will be approached for official support in clearing and rehabilitating massive areas of infestation by alien spiny cactus pear in the Eastern Cape. Such financial support will be an investment in reducing the infestation by invaders and the rehabilitation and sustainable use of natural resources in South Africa.

News Archive

UFS celebrates research excellence
2016-02-25

Description: UFS celebrates research excellence Tags: UFS celebrates research excellence

Researchers at the university were acknowledged for their new research ratings. From the left are: Prof Johann de Wet, Department of Communication Sciences; Prof Naomi Morgan, Department of Afrikaans and Dutch, German and French; Prof Corli Witthuhn, Vice-Rector: Research; Prof André Pelser, Department of Sociology; Dr Trudi O’Neill, Department of Microbial, Biochemical and Food Biotechnology; and Prof Riaz Seedat, Department Otorhinolaryngology.

During a recent gala occasion, the University of the Free State (UFS) acknowledged 15 of its researchers who received new ratings from the National Research Foundation (NRF).

According to Prof Corli Witthuhn, Vice-Rector: Research at the UFS, 37 applications have already been received for the next round of ratings by the NRF. In recent years, the university has experienced an increase in the rating of its researchers as the result of raised academic standards. These are in line with the Academic Project of the UFS. The UFS has 125 rated researchers in total.

The 15 recipients of new ratings from the NRF in 2015,are:

- Dr Tanya Beelders, Computer Science: Y2
- Dr Andrew Cohen, History: Y1
- Prof Pieter de Villiers, Theology: C2
- Prof Johann de Wet, Communication: C3
- Dr Angelinus Franke, Agriculture: C2
- Prof Jonathan Jansen, Education: B1
- Prof Riaan Luyt, Chemistry: B3
- Prof Naomi Morgan, Linguistics: C2
- Dr Trudi O’Neill, Microbiology: C1
- Prof André Pelser, Sociology: C3
- Dr Johann Rossouw, Philosophy: C2
- Prof Riaz Seedat, Health: C3
- Dr Jakub Urbaniak, Theology: Y2
- Dr Martin van Zyl, Mathematics: C3
- Prof Sue Walker, Soil, Crop and Climate Sciences: C1

The UFS also celebrated its five SARChI research chairs during this event. The main goal of the research chairs is to promote research excellence.

The five research chairs at the UFS are all established at Tier 1. Research chairs in the Tier 1 category are based on the researcher's research track record, as well as on the training record of his/her postgraduate and postdoctoral students.  Tier 1 research chairs are awarded to established researchers who are leaders in their field, and whose work is recognised internationally.

The following research chairs have been awarded to the UFS since 2013:

- Solid State Luminescent and Advanced Materials, Prof Hendrik Swart in the Department of Physics (2013-2017)
- Disease Resistance and Quality in Field Crops, Prof Maryke Labuschagne (2016-2020)
- Higher Education and Human Development, Prof Melanie Walker (2013-2017)
- Vector-Borne and Zoonotic Pathogens, Prof Felicity Burt (2016-2020)
- Humanities without Borders: Trauma, History and Memory (2016-2020) 

 

 

 

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