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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 enhances Geography in schools
2015-05-11

The Green Box

The Department of Geography at the University of the Free State (UFS), in association with the Society of South African Geographers (SSAG), is doing their part in providing curriculum support to schools. Dr Ruth Massey and Anneri Pretorius are the project managers of Green Box, an initiative to advance Geography in schools.

The Green Box supports the intermediate phase of schooling (Grades 4, 5, 6). According to Dr Massey, the worksheets and activities provided in the Green Box are aligned with the Curriculum and Assessment Policy Statements (CAPS) and the new curriculum. “These worksheets are divided into three themes: map work, physical Geography, and human Geography.

“Map work includes symbols and keys, grid references, and compass work whilst physical Geography focuses on water and waste, biodiversity and conservation, and weather and climate issues. The human Geography theme has a focus on population, rural and urban development, migration, food and farming, and transport and trade,” she said.

Each worksheet has a fact sheet section which teaches theory on the specific topic (linked to the curriculum), an activity section (all resources needed for these activities are provided in the box), and a ‘take it home’ section for further learning and practice at home.

The Green Box is a recycled plastic crate that comprises worksheets, training materials, visual aids, and resources for teaching, learning, and active engagement in Geography classes.

Also included in the box are a felt story board and characters (that link with the worksheet activities), the ‘Climate Change memory game’ (which enhances learner’s memory capabilities and teaches various climate change facts) and the ‘Sustainable Development puzzle game’ (which teaches about the social, biophysical, economic, and political elements of Sustainable Development, and how they overlap).

“All items in the box are locally sourced, robust, and without copyright,” said Dr Massey.

The project is focusing on 10 under-resourced schools in the Bloemfontein area. Each school has received three boxes (one for each grade of the Intermediate Phase).

Dr Massey said: “This box is to be shared among the teachers. The Green Boxes were distributed at a training and information workshop held at three central schools in the various districts. These workshops introduced the teachers to the contents of their box, and provided basic training on the worksheets and the activities provided.”

“The schools will be joined up with ‘Box Buddies’ at more resourced schools in Bloemfontein. These buddy schools will assist in support and in replenishing the box’s stationery, etc. when needed.”

“Monitoring and evaluation will take place for six months after the boxes have been distributed. This will ensure support to, and the sustainability of, the project.” The Green Box project was made possible through a grant from the Society of South African Geographers (SSAG).

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