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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

ANC is not a party of the people - Mbeki
2010-08-30

 

 

“The unions in this country do not understand the political economy of South Africa. They think that the ANC is the party of the people. The ANC is the party of the black middle class. The fact that the masses vote for it does not mean they control it. The policies of the ANC favour the black middle class and the established businesses. They do not favour the working class.”

This was said by renowned economic and political commentator Mr Moeletsi Mbeki, brother of former president Thabo Mbeki, during a guest lecture he recently presented to Economics students of the University of the Free State (UFS) in Bloemfontein.

“You just have to look at the types of houses that the ANC government builds for ordinary South Africans,” he said.

“If you had a party that was a pro-working class party it would not have built these so-called RDP houses that are being built by the ANC government. The unions have all along been under the illusion that the ANC is the government of the working class and (Zwelinzima) Vavi and them are now beginning to realise that this is not the case.

“The public-sector workers are in a special dilemma. They think the ANC is their ally but at the same time they feel they are not getting any benefits out of this alliance. Therefore you are beginning to get a very acrimonious environment emerging between the public-sector unions and the government.”

Regarding the current issue of the Protection of Information Bill and the proposed media tribunal that have brought the media and the government onto a collision course, Mbeki said the ANC government was trying to muzzle the media because it wanted to safeguard corruption within government.

“The question of freedom of information is very closely linked to the rise in corruption in the government,” he said.

“What the politicians are doing is that they are trying to hide that corruption. The media in this country have been playing a very critical role in exposing cases of corruption. That is why Vavi now has bodyguards.”

He said he recently met Vavi, the General Secretary of Cosatu, surrounded by four bodyguards. He said Vavi told him that he was getting death threats because he was opposing corruption in government.

Mbeki said the economic policies of South Africa were the “worst in the world” because they benefited people who were already rich and militated against the emergence of entrepreneurs.

“In fact, one of the serious downsides of Black Economic Empowerment (BEE) is that it takes people who should normally be entrepreneurs and who should be creating new companies and new jobs, out of that space and just makes them wealthy. BEE has been a disaster because it created this massive economic inequality; it created this class of idle rich who have tons of money but do nothing,” he added.

He said the under-investment in the economy was having dire consequences in terms of unemployment and poverty. He said this, coupled with the growth of consumption that Black Nationalism was driving, was actually driving down the ability of the economy to absorb labour.

“What really lies at the bottom of our economic problems in South Africa is that we have too much of a one-party dominance of our political system. We need more competition in our political system and until we realise the policies of the ANC are not going to change,” he said.

Mbeki’s guest lecture was on the topic: Architects of Poverty: Why African capitalism needs changing.

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison 
Tel:   051 401 2828
Cell:  078 460 3320
E-mail:  radebemt@ufs.ac.za  
30 August 2010

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