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14 August 2024 | Story Martinette Brits | Photo Supplied
Dr Luther van der Mescht
Dr Luther van der Mescht, Senior Lecturer in the Department of Zoology and Entomology.

Ticks that feed on South Africa’s cattle are developing resistance to the only effective pesticides, making them increasingly difficult to control. If this issue is not addressed, the spread of these parasites and their resistance to pesticides could significantly impact farmers' incomes and food security.

According to a study by Dr Luther van der Mescht, Senior Lecturer in the Department of Zoology and Entomology, many tick populations in South Africa are resistant to at least two of the three main types of acaricides (chemical classes) used in the country.

Dr Van der Mescht notes that with around 12 million cattle in South Africa, these ticks not only lower meat and milk production but also carry pathogens that can cause potentially fatal diseases. He estimates that the economic losses from tick-borne diseases and the use of acaricides could reach up to R670 million annually in the cattle industry alone.

He adds that South Africa's agricultural sector is unique due to its dual farming system, which includes both subsistence and commercial farmers, amplifying the impact of ticks. “The country is also home to a wide variety of tick species that transmit numerous pathogens across a diverse range of habitats and climates in which cattle are farmed. Consequently, the effects of ticks and tick-borne diseases in South Africa may be more severe compared to those in developed countries.”

Dr Van der Mescht highlights that ticks are developing resistance primarily due to poor farm management practices, such as underdosing, overdosing, and excessive use of acaricides. “Additionally, insufficient government support in educating farmers and managing resistance exacerbates the problem.”

Managing acaricide resistance

Dr Van der Mescht explains that while ticks will inevitably develop resistance to acaricides, this usually happens much slower if pesticides are used strategically. To slow the development of resistance, several measures can be implemented: 

• Minimise the number of acaricide treatments.
• Assess tick diversity and acaricide resistance at the farm level and monitor it regularly. The study found that acaricide resistance was highly variable across South Africa, likely due to different farm management practices; hence it should be assessed at the farm level.
• Quarantine animals when transferring them to a new farm, ensuring they are free of ticks before releasing them.
• Rotate acaricides from different chemical classes, with a gap of at least two years between applications.

• Government veterinary services should raise awareness about acaricide resistance and provide support, particularly to under-resourced farmers. Establishing acaricide resistance testing laboratories would help monitor resistance and offer guidance to farmers.

Expert in parasitology

Dr Van der Mescht is particularly fascinated by the fact that most animals on earth follow a parasitic way of life. He graduated with a PhD in Conservation Ecology from the Department of Conservation Ecology and Entomology at Stellenbosch University in 2015, focusing on rodent parasites.

Career highlights include receiving the Wilhelm Neitz Memorial Scholarship in Parasitology from the Parasitological Society of Southern Africa (PARSA) for study abroad, and the Blaustein Centre for Scientific Cooperation Postdoctoral Fellowship in 2016 from Ben-Gurion University of the Negev, Israel, to conduct research on the experimental evolution of host specialisation. He also received the Claude Leon Foundation Postdoctoral Fellowship in 2019 to study the cat flea at Stellenbosch University’s Department of Botany and Zoology.

With over four years of experience in the industry at a contract research organisation, he has conducted more than 40 clinical studies for international pharmaceutical companies and published over 50 peer-reviewed scientific articles.

Making research visible, impactful, and relevant to society

Dr Van der Mescht recently published an article for The Conversation and participated in interviews with eNCA, Newzroom Afrika, and Cape Talk to discuss his research. “This effort aligns with the Vision 130 strategy of being a regionally engaged university and supports one of the key pillars of research development at the University of the Free State (UFS), which is to make our research visible, impactful, and relevant to society.”

He also highlighted the significance of popular science, noting that it helps scientists communicate their research to a broader audience, build their professional reputation, enhance their funding opportunities, and improve their research outcomes.

News Archive

Artistic development at UFS to transform the face of Bloemfontein creatively
2015-07-02

The 7-metre high ‘Urban Fox’ is one of Alex Rinsler's artworks adding a fragment of the wild to the city of Shanghai in China.

Bold, bright, and beautiful public art sculptures are in the inception phase at the university’s Bloemfontein Campus. Manchester-based public artist, Alex Rinsler, of the Programme for Innovation in Artform Development (PIAD)’s forum for artist development, is to install three enthralling sculptures in the city of Bloemfontein.

The PIAD forum for artist development is an initiative of the Vrystaat Arts Festival, formerly known as the Vryfees, which aims to celebrate art in the Free State by hosting experimental art practices. In its capacity as a PIAD partner, the University of the Free State promotes increased access to, and participation in, culture as a form of human development.

Presenting an artist’s talk titled ‘Urban Safari: Art in public space,’ on the Bloemfontein Campus recently Rinsler introduced himself and his creative ideas to students, staff, and the public at the Johannes Stegman Art Gallery. The talk served as an invitation to the active participation of Bloemfontein citizens in all phases leading to the installations. Dispersed across the Mangaung Metropolitan, the giant sculptures are intended to capture and reflect different aspects of the community’s lived experiences. 

As a public artist based in the United Kingdom (UK), Rinsler has exhibited in cities nationally and internationally, with the intention of bringing a touch of the wild to urban lives. His vision is to witness the development of cities into cultural boulevards, and explore “what we can do to bring back the sense of nature, the wild” by adding new symbolism to urban lifestyle.

“I believe in creating work accessible to the public, which stimulates conversation,” said the Clore Leadership Programme Fellow (University of Manchester) and Founder of Pirate Technics - an artistic practice company.

In 2012, he worked with 31 Master’s students from 24 countries on an icon for global peace named “Under the Baobab” in London. The colourful and magnificent Baobab tree made from pieces of fabric representing distinct cultures told the story of migration to London.

Rinsler is determined that the Bloemfontein “project, similar to the London installation, will create imagery that people will remember.”

Dr Ricardo Peach, Director of the Vrystaat Arts Festival and PIAD, hopes the project fosters diversity while producing a “communal cultural product." 

“What I know about Alex’s work is that he will be working with what he calls a self-selected community, people who are interested in this, and who want to work together to build these sculptures, as part as a process for them to get a sense of where they belong, and their input into the city. It’s about people telling their own stories.”

The public installations are a way of transforming the landscape, and connecting people of “a place like Bloemfontein where communities are often still so divided,” said Peach.

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