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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

A new dawn for student governance

2011-09-02

Our SRC presidents: Richard Chemaly (Bloemfontein Campus) and Bongani Ncgaca (Qwaqwa Campus)
Photo: Hannes Pieterse

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The successful and peaceful completion of the University of the Free State’s (UFS) Student Representative (SRC) elections 2011 herals a new dawn for student governance with the announcement of the results today (1 September 2011).

The SRC elections at the Qwaqwa Campus were completed on 25 August 2011, while the elections at our Bloemfontein Campus took place on 29 and 30 August 2011.

“A new dawn heralds a new day when Richard Chemaly, the son of Lebanese immigrants becomes President of an SRC, as elected by students from all racial backgrounds and from across the student body at large. A new day has arrived when candidates could have won voter support across racial lines; a new day is here when all SRC members are now recognised leaders on the basis of academic accountability,” the Dean of Student Affairs, Mr Rudi Buys, says.

A new dawn has arrived; firstly, insofar as student elections for the choice of student leaders at the UFS now proceed according to a non-racial and a non-party political basis.

Not only did the SRC elections at both the Bloemfontein and Qwaqwa Campuses achieve its required quorum, with 31% (4 729 votes) and 50% (2 112 votes) voter turnout, respectively, but the SRC elected by students at the Bloemfontein Campus is 55% black and 45% white, and 60% female and 40% male. The numbers of votes gained by successful candidates also indicate that voters from all racial backgrounds have voted for their candidates of choice.

Secondly, a new dawn has arrived insofar as student governance occupied by only some student groups claiming to speak on behalf of all students has made way for direct voting for candidates by the broad student body and the threefold increase of student governance structures on campus.

Not only did all students at our Bloemfontein and Qwaqwa Campuses (a total of 15 173 and 4 257, respectively) have the opportunity to participate in voting directly, but nine additional Student Councils were established at our Bloemfontein Campus that each holds an ex officio seat on the SRC and allows for student governance in all the major student sectors of the student body, such as for postgraduate students, international students and all categories of student associations.

The various councils now established include the Student Academic Affairs Council, the Student Associations Council, the Postgraduate Student Council, the International Student Council, the Student Media Council, the Residences Student Council, the Commuter Student Council and the Rag Community Service Fundraising and Service Councils. In addition, all faculties also introduced student representative structures at departmental and faculty level in 2011 to ensure student participation in faculty management and governance.

The SRC members at the Bloemfontein Campus are:

Elective portfolios:
President: Mr Richard Chemaly
Vice-President: Mr Lefata David Maklein
Secretary: Ms Matshepo Ramokgadi
Treasurer: Mr Werner Pretorius
Arts & Culture: Ms Alta Grobelaar
Accessibility & Student Support: Mr William Clayton
First-generation Students: Ms Petre du Plessis
Media, Marketing & Liaison: Ms Biejanka Calitz
Sport: Mr Bonolo Thebe
Student Development & Environmental Affairs: Ms Busisiwe Madikizela
Transformation: Ms Qaqamba Mhlauli

Ex officio portfolios:
Dialogue & Ex officio: Associations Student Council: Mr Anesu Ruswa
Academic Affairs & Ex officio: Academic Affairs Student Council: Mr Jean Vermaas
Residence Affairs & Ex officio: Campus Residences Student Council: Ms Mpho Mokaleng
City student Affairs & Ex officio: Commuter Student Council: Ms Annemieke Plekker
Postgraduate Affairs & Ex officio: Postgraduate Student Council: Ms Glancina Mokone
International Affairs & Ex officio: International Student Council: Mr Pitso Ramokoatsi
Student Media Affairs & Ex officio: Student Media Council: Ms Nicole Heyns
RAG Community Service & Ex officio: RAG Fundraising Council: Ms Iselma Parker
RAG Community Service & Ex officio: RAG Community Service Council: Ms Motheo Pooe

In the Qwaqwa elections, SASCO achieved 36,84% of the vote, with SADESMO, PASMA and NASMO each achieving 29,73% and 18,56% and 12,74%, respectively .

Mr Bongani Ncgaca was elected as the President of the SRC at our Qwaqwa Campus, while the names of the SRC members at the campus will be announced on 7 September 2011.

The Central SRC will be established on 8 September 2011 by a joint sitting of the two SRCs.

The successful completion of the SRC elections at the Bloemfontein Campus follows a yearlong review process of student governance by a Broad Student Transformation Forum (BSTF) that consists of 59 delegations from student organisations and residences. The BSTF adopted independent candidacy for elective portfolios and additional student councils to provide ex officio seats on the SRC as the template for student governance, following the consideration of a series of benchmarking reports on student governance nationally and internationally.

The UFS Council adopted the new SRC Constitution, as drafted and submitted by the BSTF, on 3 June 2011.

Media Release
1 September 2011
Issued by: Lacea Loader
Director: Strategic Communication
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: news@ufs.ac.za

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