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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

'Structures of Dominion and Democracy' by David Goldblatt at the Johannes Stegmann Art Gallery
2015-08-03

Photograph by David Goldblatt, On August 16 2012 South African Police shot striking mineworkers of the Lonmin platinum mines, killing 34 and wounding 78 within a radius of 350 metres of this koppie, where the men used to meet. Seventeen of the men, seeking shelter among boulders from police fire, were shot with seemingly lethal intent, some with their hands up in surrender, none were given medical assistance for their wounds. Beyond is the Lonmin smelter, which stood idle during the strike. Marikana, North-West Province, 11 May 2014.

The University of the Free State, in partnership with the Goodman Gallery, presents the exhibition, 'Structures of Dominion and Democracy', by renowned South African photographer David Goldblatt.  

This exhibition, which runs from 13 July to 7 August 2015 on the Bloemfontein Campus, is dedicated to the series, “Structures”, one of the major bodies of works by Goldblatt.  For over three decades, Goldblatt has travelled South Africa, photographing sites and structures weighted with historical narrative: monuments, private, religious and secular, which reveal something about the people who built them.  These sites allow us a glimpse into the everyday. Each place is a repository, a landscape containing an epic story that has involved whole communities: the experience sometimes told through the memorialising of remarkable individuals.

The exhibition, Structures of Dominion and Democracy, traverses two distinct eras in South Africa history. As Goldblatt explains: "Over the years, I have photographed South African structures, which I found eloquent, of the dominion which Whites gradually came to exert over all of South Africa and its peoples.  That time of domination began in 1660 when Jan van Riebeeck ordered a cordon to be erected of blockhouses and barriers that would exclude the indigenous population from access to the first European settlement in South Africa and its herds, lands, water, and grazing.  The time of domination ended on the 2nd of February 1990, when, on behalf of the government and the Whites of South Africa, President FW de Klerk effectively abdicated from power.  Beginning in 1999 and continuing to the present, I have photographed some structures that are eloquent of our still nascent democracy.  In the belief that, in what we build we express much about what we value, I have looked at South African structures as declarations of our value systems, our ethos.”

Johannes Stegmann Art Gallery, UFS Sasol Library
University of the Free State
206 Nelson Mandela Ave
Bloemfontein

Gallery hours:  
Monday to Friday 08:30 – 16:30

Entrance: Free
Enquiries: 051 401 2706, dejesusav@ufs.ac.za

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