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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

Researcher finds ways to serve justice efficiently
2016-01-07

Description: Prof Monwabisi Ralarala  Tags: Prof Monwabisi Ralarala

Prof Monwabisi Ralarala tackled the serving of justice from a linguistic viewpoint.
Photo: Supplied

In 2012, local and international media was saturated with reports of the Eugène Terre’Blanche murder trial. At the judgment, Judge John Horn read a lengthy extensive document, of which three pages were dedicated to voicing his concern about how police officers distort statements in the process of translation. Considering the fact that statements are the entry points to the criminal justice system, Prof Monwabisi Ralarala’s attention was drawn to the negative impact such distortion had insofar as the administration of justice was concerned. Of the three PhD degrees conferred by the University of the Free State (UFS) Faculty of Humanities at the 2015 Summer Graduation, one was in Language Practice with Prof Ralarala’s name on it.

Prof Ralarala’s research interests in language rights, forensic linguistics, and translation studies led him to use the Terre’Blanche trial as the basis for his second PhD case study titled: Implications and explications of police translation of complainants' sworn statements: evidence lost in translation. The doctoral dissertation focused on police stations in the Xhosa-speaking community of Khayelitsha in Cape Town.

Language and the law

When the victim of a crime approaches the South African Police Services (SAPS), the requirements are that a sworn statement be taken. However, as a prerequisite, the narration needs to be translated into English.  “The process unfolds in this manner: the complainant or the person laying the charges speaks in a language that they understand, and then the police officers translate that information into English because English is still the de facto language of record,” explained Prof Ralarala.

In the process of translation, the original narrative is lost, and so is some of the evidence. “They [the statements] have to be packaged in a certain way, in the form of a summary. As a police officer, you have to discard all the original narrative and create another narrative which is in English,” added the Associate Professor and Institutional Language Coordinator at the Cape Peninsula University of Technology.

Evidence is the basis of any court case and, when it is translated by police officers who do not hold the credentials of professional translators, a problem inevitably arises.

Because police officers are not trained in translation, “Some of the statements are filled with distortions, changing of information all together. In some cases, one would come across a case which was initially an assault but then - through the change and transformation, re-narration, retelling of the story by someone else - it becomes a case of attempted murder.”

Considering that a statement determines a suspect’s fate, it becomes all the more important to ensure that accuracy is upheld.

His internal and external supervisors, Prof Kobus Marais and Prof Russel Kaschula from the UFS and Rhodes University respectively stated that his PhD work has been hailed as a gem by international scholars. “According to one international assessor, he has made an exceptional contribution to the humanities and social sciences in general and to the fields of linguistics and translation studies in particular.”

Reshaping the landscape

According to Prof Ralarala, there are huge gaps in the translated versions of statements which create a problem when a ruling is made. Some of the recommendations put forward in his dissertation to bridge that gap are:

• to review the language policy insofar as the criminal justice system is concerned. The languages we speak are official and constitutionally embraced, and they hold the same status as English, hence they need to be used in criminal justice processes;
• to revisit the constitution and review if the provisions made for the Nguni languages are implemented;
• to supplement paper and pen with technology such as tape recorders. Statements can be revisited in cases where a controversy arises;
• to deploy professional translators and interpreters at police stations;
• to design a manual for police officers which contains all the techniques on how a statement should be taken.
• to enforce constitutional  provisions in order to reinforce the language implementation plan in as far as African languages are concerned .

These recommendations serve to undo or eliminate any perceived injustices perpetuated and institutionalised by current linguistic and formal practices in South Africa's criminal justice system.

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