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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

The science of translation
2015-09-16

What is the relationship between a translator, information, and an audience? Professor Christiane Nord explored the connection in a series of lectures hosted by the Linguistics and Language Practice Department and the Department of Hebrew of the University of the Free State (UFS) Bloemfontein Campus.

Since 2007, the professor for Translation Studies has been a research associate and professor extraordinary in the department, assisting translation and interpreting students in gaining a global perspective on their disciplines.

The world-renowned German scholar and trained translator for Spanish and English is also an author, with over 200 published articles on the so-called Skopos Theory, which formed the basis of the lectures on 7 and 8 September 2015. The addresses were centered on the functionality and limitations of translations.

Translation as a purposeful activity

According to Prof Nord, all translations should be geared towards conveying messages which the audience understands. This communicative purpose involves taking into consideration the cultural background of the recipient.

As a seasoned practitioner, Prof Nord has been guided by Skopos Theory in her teaching endeavours. Hence her firm stance: “If you do not have a theory, you cannot justify your translational decisions.”

Within the context of the Skopos Theory, she explains that, in order to produce a functional translation, the translator must analyse the purpose of the translated text, which includes the questions for whom, when, where, and through which medium will it reach the intended audience.

How to deal with doubt in functional translation

“Doubt is something we are accompanied by when we’re translating.” Such doubt may be caused by “insufficient proficiency with regards to source and target languages and cultures, domain and terminological knowledge, and knowledge in translation theory and methodology,” said Prof Nord. However, the top-down approach offers a solution to overcome uncertainty, at least to some extent. This approach considers, first and foremost, the target audience for which the translation is tailored. Based on this consideration, the translator is able to determine the approach that is most suitable for the audience, hence eliminating doubt.

In sum, the extraordinary professor asserted that there are no rules for translation, contrary to popular belief. According to Prof Nord, the main focus of a translator or interpreter should be to produce texts in the target language and culture which meet the requirements of the translation brief set by the client or commissioner.

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