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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.

News Archive

State of our campuses: Impact of non-completion of the 2016 academic year on UFS students

2016-10-08

Dear Parents/Guardians and Students,

Impact of non-completion of the 2016 academic year

The University of the Free State (UFS) reiterates its support and commitment to the cause of free higher education. We have stated our position in all the available spaces. We want to work with UFS students to put pressure on the government to commit itself to accept the many suggestions put forward to make free education possible within a negotiated timeframe.

We are also seriously committed to our responsibility of providing education to all students enrolled at the university. We are doing our outmost to ensure that we can resume academic activities next week.

Description: " Academic non-completion 2016 Tags: " Academic non-completion 2016

We want to bring to your attention what will happen to individual students if the UFS cannot resume classes fully on Monday 10 October 2016.

Currently we have extended the academic year by one week. Some faculties are working on Saturdays and Sundays, starting earlier and finishing later to complete the material that needs to be taught and the practical work that students need to do to be able to write exams.

In the three biggest faculties at the university: Education, the Humanities, and Natural Sciences, this is what will happen:

Education will fail to graduate 1 193 students
Humanities will fail to graduate 1 125 students
Natural and Agricultural Sciences will fail to graduate 1 390 students

In the professional faculties: Economic and Management Sciences, Health Sciences, and Law, this will happen:

Economic and Management Sciences will fail to graduate 997 students
Health Sciences will fail to graduate 633 students
Law will fail to graduate 619 students

In total, approximately 6 000 students will not receive complete transcripts of their degrees and the certificates for their qualifications.

The university currently has 3 238 students on NSFAS bursaries. None of these students will be able to apply for bursaries for the lost year. They will be regarded as having failed or not completed their courses. They will not only miss this year, but the opportunity of studying in the future.

These students come from families to which their success in higher education was supposed to mean a change in the future of the entire family. Some parents/guardians hold more than one job to be able to pay tuition fees.

In not allowing the year to continue and students to finish, we are throwing away the efforts that entire families of poor people have made for four or five years to put their children through university. The promise of free education for future generations means nothing to these families who are poor in the present.

In terms of the academic calendar, it is a false argument to say that universities will be able to enrol first-years, because what 2016 students will miss, is the second semester.

We do not have the capacity to teach double the number of students in the second semester. This also misses the point that those students who were completing modules in order to graduate, will waste an entire year (assuming they have funding) to complete their degrees. This argument does not see the knock-on effect that students, not promoting in modules from first to second and second to third year, etc., will have. Finally, this also misses the point of what will happen to students who have to repeat first-semester modules.

In terms of academic staff, students are discounting the willingness of academic staff to teach double or to have the academic year extended by approximately six weeks between teaching and examinations. The same can be said for all the administrative and support staff required for running the university.

In our case, all the students in the University Preparation Programme (UPP) on the South Campus in Bloemfontein will be stuck without being able to move into mainstream modules, preventing a new intake of UPP students for 2017. These are the poorest and most disadvantaged students at the UFS.

It is absolutely necessary to find a means of protest and political action that will not jeopardise the future of current students and the country’s desperate need for critical skills. The interdict against violent protest secured by the UFS is still in force. The police will intervene if the interdict is not respected and the UFS will have no control over police actions.

We trust that parents/guardians and students understand the implications of the situation.

Kind regards,

Prof Nicky Morgan
Acting Rector
University of the Free State

Released by:
Lacea Loader (Director: Communication and Brand Management)
Telephone: +27 51 401 2584 | +27 83 645 2454
Email: news@ufs.ac.za | loaderl@ufs.ac.za
Fax: +27 51 444 6393

State of our campuses #11: Academic activities on UFS campuses continue

State of our campuses #10: Impact of non-completion of the 2016 academic year on UFS students

State of our campuses #9: Academic programme on all UFS campuses to resume on Monday 10 October 2016

State of our campuses #8: UFS extends vacation as from 28 September until 7 October 2016, 28 September 2016

State of our campuses #7: All three UFS campuses will be closed today, 27 September 2016.

State of our campuses #6: All UFS campuses reopen on Tuesday 27 September 2016

State of our campuses #5: UFS campuses to remain closed on Monday 26 September 2016

State of our campuses #4: Decisions about the UFS academic calendar

State of our campuses #3: UFS campuses closed until Friday 23 September 2016

State of our campuses #2: UFS Bloemfontein and South Campuses closed on Tuesday 20 September 2016 (19 September 2016)

State of our campuses #1: Academic activities suspended on UFS Bloemfontein Campus (19 September 2016)

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