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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

B. Iur. programme in Occupational Risk Law first of its kind in the country

2010-11-26

The University of the Free State (UFS) will offer a B.Iur. degree programme in Occupational Risk Law from 2011.

This programme of the Faculty of Law is the first of its kind to be offered in South Africa and positions the UFS in the forefront of this field of study.

The programme is designed to develop and qualify professionals, knowledgeable in the field of occupational risk law as prescribed by South African legislation and international best practices. It further offers a qualification based on a well-researched basis of applicable legal principles, combined with safety, health, environmental and quality risk management principles applicable to employers and employees in a specialised industry.

The B.Iur. (Occupational Risk Law) has been developed by experts within the parameters of international comparability, according to research-based identification of career demands and requirements in the fields mentioned.

By introducing this programmesignificant progress will be made towards achieving the nationally stated objective of legal safety, health and environmental quality assurance in the workplace and within the broader community. The programme will also encompass the values and standards prescribed by the Institute of Safety Managers. This will provide them with a further step towards the regulation of the professional en ethical standards in the field of legal safety, health and environmental quality assurance.

With the programme, the UFS not only creates a unique opportunity for stakeholders and learners to add meaningful value to their careers, but also exerts a meaningful influence on the industry and society in terms of the acquisition of a most appropriate type of qualification. The B.Iur. (Occupational Risk Law)degree therefore offers a meaningful contribution towards the industry through addressing the increasing demand for career opportunities in the field of legal safety, health and environmental quality compliance.

The new programme is the result of an agreement between the faculty and its partner, IRCA Global. The university officially launched its partnership with IRCA Global, an international supplier of risk management solutions pertaining to safety, health, the environment and quality in 2008. As part of the agreement, the UFS will offer short learning programme, a diploma and a degree in Risk Management.

IRCA Global is a South African company in the international risk control and SHEQ environments with filials in Africa, Australia, India, Eastern Europe, and South America.

In the interim IRCA Global has continued with the marketing of the programme, with the result that hundreds of potential students are waiting for the launching of the programme. The faculty is geared towards offering the programme in e-learning. New modules will also be offered with the help of IRCA’s trained and skilled facilitators. The faculty also utilises the partnerships entered into with IRCA to appoint practising specialists as part-time lecturers for the occupational risk law component of the programme as well as to develop a new specialist component amongst the permanent staff.

The programme is already active and students can register for the first semester 2011 (study code 3324, programme code M3000). Direct your enquiries to Cora-Mari de Vos at 051 401 3532 or devosc@ufs.ac.za.

The programme consists of fundamental modules of the LL.B. and B.Iur., as well as short learning programmes in the Faculty of Law and specially developed core modules in occupational risk law. The B.Iur.in Occupational Risk Law enables successful candidates to enrol for applicable Post Graduate Diplomas or a cognate Honours Degree. Obtaining one of these qualifications provides the platform to articulate to Magister degrees. Horizontal articulation possibilities exist with the accredited Baccalaureus of Law (LL.B.) which is presented by several institutions in the country.

Media Release
Issued by: Lacea Loader
Director: Strategic Communication (actg)
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl@ufs.ac.za
26 November 2010

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