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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

UFS’ position on student politics
2011-09-01

The University of the Free State (UFS) welcomes politics on its campus. It especially invites students to participate in all the political activities on campus, ranging from seminars and debates on national and provincial politics, and organization within party political structures. Earlier the year, in the run-up to the Local Government Elections, a programme was run on campus with all political parties participating in public and radio debates with students on political issues.

A university must be a place for all kinds of ideas and organizations---social, cultural, religious, academic and, yes, political. The perception that the UFS has “banned” politics is simply not true, nor is it possible within a constitutional democracy.
 
The University of the Free State once again invites SASCO and any other political groupings that have not yet registered to participate in campus life, to do so as soon as possible. It is important to the UFS that all student bodies enjoy full participation in campus life, and that there exists a vibrant and exciting political life on the campus alongside academic, social, cultural and religious life.
 
The Student Representative Council (SRC) Elections at the UFS has been constituted on independent candidacy and non-party-political basis. This is a decision crafted and recommended by the Broad Student Transformation Forum, whose members are elected by students, and approved for implementation by the highest authority of the university, the Council. The decisions of the Student Forum entails that all students can nominate individuals for a variety of student leadership positions, which includes nomination for elective portfolios in the SRC elections, but also within nine sub-councils that hold ex-officio seats on the SRC.
 
The old system which restricted student leadership to representation on a party-political basis only (DA, ANC, Freedom Front Plus etc) no longer exists.
 
This decision of the Student Forum ensures that the rights of all students to directly elect their representatives are protected, and that the SRC in fact represents the student body as a whole and not particular interest groups alone. This decision enables ALL students to stand for and participate in campus politics in the SRC elections, though not on a party political ticket. In the 2011 SRC Elections, for example, SASCO members were indeed mandated by its local branch to stand as candidates for various elected positions, as did other political parties such as the DA Student Organisation, a development which the university welcomes. 
 
Most importantly, the UFS insists that all students participate in university life with respect for the rights of all students, irrespective of their social beliefs or political commitments. The UFS insists that no student or student grouping acts to disrupt campus life or insult university staff or denigrate fellow students on grounds of race, religion, language, gender, etc. This is very important to the UFS as it works to build a non-racial culture that respects our common humanity. Our students must learn that democracy and decency go hand in hand, and that part of learning at a university, is to learn to differ without resorting to a language of derision.
 
In short, the University of the Free State warmly welcomes full participation in politics, as in other spheres of student life, on all three its campuses.
 
Statement by Prof. Jonathan Jansen, UFS Vice-Chancellor and Rector.

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