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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 satisfied with proceedings of EFF National People’s Assembly
2014-12-17

The University of the Free State (UFS) is happy about another successful hosting of a political party; this time, the Economic Freedom Fighters (EFF). In the recent past (December 2012), the UFS hosted the African National Congress (ANC) with the same energy, support and selfless commitment as with the EFF.

“The fact that the EFF paid the required amount for the use of the university’s venues in full before the congress commenced, bears testimony to this. For the past two months, the UFS’s working team worked closely with the EFF’s logistics team to thoroughly plan for a smooth and successful National People’s Assembly,” says Dr Choice Makhetha, Acting Rector of the UFS.

The hard work and commitment invested in the preparation process paid off. The 1st EFF National People’s Assembly, held 13-16 December 2014 on the Bloemfontein Campus, was a huge success.

“It is with great excitement that I can report that all premises of the UFS have been left the way they were found on arrival; no damage to any property and no littering.”

“Thank you to the UFS staff members who worked selflessly on a daily basis: the cleaning staff who started very early in the morning and went home very late at night; garden staff who made sure that the grounds were exceptionally clean every day and the flowers bright; student volunteers who worked shifts of over 24 hours on the first day, making sure that EFF delegates were checked into residences; staff members at the Visitors Centre who were ready to share information about the university and provide support to EFF delegates; staff members at the Odeion (which served as media centre) who ensured that the national and international media houses were comfortable and that the media conferences ran smoothly; safety and security personnel who provided protection for all the people on campus and also ensuring safety of the buildings; the health and safety officers supported by our partners from ER24 emergency services; and the South African Police Services (SAPS). To the electricians, the plumbers and other colleagues from Physical Resources who assisted with any task, even beyond the call of duty, we say thank you. For all the support and extra miles travelled – we appreciate your passion for the work you do; you are all very important to us at the UFS.”

“As the University of the Free State, we would like to express our gratitude to the leadership of the EFF, the delegates, guests and partners, as well as the media houses. The level of discipline among delegates was impressive. The UFS staff members appreciate the level of professionalism and respect shown by the EFF leadership and delegates. All the best for the future!,” says Dr Makhetha.

The UFS will continue to host political parties, interest groups, associations and more in their diversity, provided there is availability of venues, events are held outside the academic period and payment is received well ahead of hosting. As a public institution of higher learning, the university has a responsibility to promote democracy and help deepen the principles thereof. A university is a perfect platform for differing views and diverse political formations to find expression.

“To the UFS community, thank you for the trust you showed in the working team as it prepared to host the EFF’s 1st National People’s Assembly. To Mangaung Metropolitan Municipality and the Free State Province – we appreciate the support. As the University of the Free State, we know we can always count on you!”, says Dr Makhetha.  

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