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Rising tick pesticide resistance threatens South Africa’s cattle industry

14 August 2024 | Story Martinette Brits | Photo Supplied

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.

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Address by the first Inaugural President of the Central SRC

2005-08-03

The UFS Central SRC

Address by the first Inaugural President of the Central SRC of the University of the Free State, Mr Tello Motloung on Wednesday 3 August 2003

The Chairperson of the UFS Council, Judge Faan Hancke,
The Vice-chancellor and Rector of the UFS, Prof Frederick Fourie
The Vice-Rector Student Affairs of the UFS, Dr Ezekiel Moraka
The Presidents of the main campus SRC and the Vista campus SRC
Colleagues in the Central SRC, campus SRCs, students and fellow South Africans

Please receive my heartfelt revolutionary greetings

Vice-chancellor and rector what I bring here with me assisted by facts, is just the work of my imagination. Like a love letter addressed to a sweetheart miles away, even though you do not know how she feels, what she wants to hear, and do not even know what she looks like.

I value speech as just an honest intimation, that’s why I got into a habit of establishing a dialogue with people, looking at each other’s face, and persuading one another of what we are saying.

Vice-chancellor, today marks an important milestone in the history of the existence of the UFS. Today reflects the confidence and trust that students of the UFS have placed in us. They are confident that the Central SRC has both the will and the capacity to take our university forward as we confront the challenge of transformation.

Students are confident that they are correct to trust the Central SRC as the principal agent of change in our university that is genuinely committed to the objective of building a non-racial, non-sexist and democratic university. We need to frankly ask ourselves, as CSRC members, whether are we up to all these challenges?

All Central SRC members have to understand this fully, internalize it, and ensure that everything we do, does not betray the confidence and trust of students, or disappoint their expectations. I say this knowing that all Central SRC members have committed themselves to serve the students of the UFS, black and white, and no one among us (CSRC) needs any special lectures about this central commitment.

The UFS should be an omnibus, welcoming everybody on board. But we should be a bus with a clear direction. We will certainly lose our way if we, as an institution, don’t have a clear road map spelling out where we are heading to.

There should be clear guidelines on the role of students in the transformation process. Students should also be viewed as role players in transformation along with the University management, and not just opposing forces. There is no right time, other than this one, to move away from the politics of opposition to politics of transformation.

However, we need the support of management to do so. The University should value the role and contribution of student leaders, hear our legitimate claims and consider them as part of political and policy decision making.

Vice-chancellor and Rector, it remains our task to ensure that the UFS is transformed into an institution that is seen to be playing a vigilant role in developing students academically, intellectually, socially, culturally, politically and otherwise. The process of transformation is not ending tonight, it is just beginning tonight.

Judge Hancke, Prof Fourie, Dr Moraka, fellow students and fellow South Africans, I lead students at this university with a sense of pride and duty, and I know very well that I lead men and women, students who are all determined that we reach our destination safely and on time.

A navy divided within its ranks will be destroyed and vanquished by the enemy, but the navy united in purpose and action, loyalty and commitment will not sink but sail on to victory.

It is befitting to mention that every drop of my blood is telling me that the UFS is my home. I firstly became a student here, I became the SRC treasurer in my first year here, I became the deputy president here, and I became the first president of the Central SRC of the UFS.

Therefore you should never doubt my commitment towards the transformation of this university. To paraphrase what was said by students at another institution, “If there is no UFS in heaven, then I am not going.”

Let me conclude by thanking my ancestors for teaching me that even if I wined and dined with kings and queens, I am not a king myself, so I should not turn my back on people who made me what I am today.

Most importantly, I would like to thank the Almighty God and the grace of our Lord Jesus Christ for giving me time and power to lead this university.

It will be theoretically irresponsible if I ended my speech without indicating that “Only a Kovsie knows the feeling”.

I thank you.

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