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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 researcher fills void in South African policing history
2017-01-02

Description: Dr Cornelis Muller Tags: Dr Cornelis Muller 

Currently a Postdoctoral fellow in the International
Studies Group, Dr Cornelis Muller’s PhD thesis explores
late nineteenth century South African policing on the
Witwatersrand.
Photo: Rulanzen Martin

“I used policing on the Witwatersrand as a lens through which to examine aspects relating to state formation within the South African Republic.”

This is how Dr Cornelis Muller, a postdoctoral fellow in the International Studies Group at the University of the Free State (UFS), described his PhD thesis called Policing the Witwatersrand: A history of the South African Republic Police, 1886-1899. The thesis fills an empirical void in the history of settler colonial policing in South Africa.

His research was also featured in the South African Historical Journal, which is published by Routledge. Dr Muller received his PhD from the UFS during the 2016 Winter Graduation ceremonies. He received a scholarship from the university to conduct his three-year research.

Relationship between police and state examined
The study presents itself as an institutional biography in which the relationship between the South African Republic Police (known as the Zarps), the state, and broader society are examined. The period under investigation was a time when political, economic, and social complexities on the Witwatersrand created tension between South Africa and Great Britain.

An important theme throughout the thesis is the relationship between the police, the mining industry, and the so-called Uitlander community. Crime was also an important contributing factor to the complex relationship that developed between the Zarps and the policed in Johannesburg’s formative years.

“Johannesburg was a town under siege by a variety of crimes which ranged from vagrancy, drunkenness, gambling, and prostitution to robbery, murder, and assault,” said Dr Muller.

Archives in South Africa and Great Britain consulted
“My thesis follows a chronological approach in which various themes accounting for the development of the police on the Witwatersrand are highlighted.” Framed within the bureaucratic and administrative functioning of the Zarps, he examined aspects relating to crime, crisis, and conflict between the police and society. The thesis also details the relationship between the police and Johannesburg’s black community.

As with any historical research, it comprised internal and external source criticism and content analyses of a wide range of archival records.

Dr Muller had the opportunity to visit several archives and libraries in South Africa and Great Britain. “Some of the more important archival collections were assessed at the National Archives in Pretoria.” These included the Archive of the State Attorney and the Archive of the Magisterial District of Johannesburg.

“My study thus adds to scholarship that seeks to provide a more nuanced understanding of the South African Republic’s administrative functioning and internal politics in the late nineteenth century,” concluded Dr Muller.

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