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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

Safeguarding one of the world’s most vital staple foods was at the heart of the inaugural lecture delivered by Prof Botma Visser, Professor in the Department of Plant Sciences at the University of the Free State (UFS), on Wednesday 3 September 2025. Prof Visser shared insights from nearly two decades of research into wheat rust – a devastating crop disease that threatens both South Africa’s harvests and global food security.

“Wheat production in South Africa is threatened by three fungal pathogens that cause rust disease on the crop. Understanding the factors that contribute to virulence on locally grown cultivars is crucial to ensure continued wheat production,” said Prof Visser.

The fight against evolving wheat rusts

For the past 17 years, Prof Visser’s research has focused on the genetic structure of rust populations and the risks they pose to food security. His work has shown that these populations are dynamic and constantly changing due to genetic mutations within existing races, as well as the introduction of new races into South Africa.

“Computer modelling showed that rust can spread over vast distances by prevailing winds. During the 20th Century, at least four Southern African stem rust races managed to move across the Indian Ocean from Southern Africa to Australia. South Africa, in turn, received multiple new races from mid-Africa across Zambia and Zimbabwe, without any means of stopping these introductions,” he explained.

To respond to this challenge, his team recently implemented MARPLE (Mobile And Real-time Plant disEase) diagnostics using fourth-generation nanopore sequencing technology. This approach allows the rapid characterisation of fungal isolates, specifically targeting genes linked to fungicide resistance and virulence.

“This work,” Prof Visser noted, “is part of an effort to safeguard global wheat production.”

His research is a collaborative effort with Prof Willem Boshoff (Department of Plant Sciences, UFS) and Dr Tarekegn Terefe (Agricultural Research Council – Small Grain, Bethlehem). Together, their work has positioned the UFS as an internationally recognised centre of excellence in wheat rust research.

About Prof Botma Visser

Prof Botma Visser obtained his BSc in Botany and Microbiology (1988), BSc Honours in Microbiology (1989), and MSc in Botany (1993) at the University of the Free State, where he also completed his PhD in Botany in 2004.

His career spans more than 18 years of research into wheat rust pathogens, combining annual surveys, race pathotyping, molecular genetics, and cutting-edge sequencing technologies. His expertise has not only advanced understanding of rust population dynamics in South Africa but also contributed to global collaborative studies on crop disease.

News Archive

“Aren’t auntie and them hungry yet?” Country folk worried about NSH hikers

2014-05-15

About 5 km short of Wortelfontein Guestfarm in the Northern Cape, Rachel Swart is sitting on the porch of her peasant house when four people come walking down the dirt road.

Guests on foot are not a regular sight in this region, because you must understand, Wortelfontein is situated where Hanover lies far behind you and Richmond is still a very long way off.

The four people on the dirt road are the hikers from the University of the Free State (UFS) on their way to Cape Town (on foot) to create awareness for food-insecure students at the UFS.

Adele van Aswegen, Ronel Warner, Ntokozo Nkabinde and Nico Piedt are already on the road for more than two weeks as part of the No Student Hungry bursary’s (NSH bursary) fundraising efforts. The bursary provides assistance to students at the UFS who often do not have enough to eat.

On day 12 of their walk, the plan was that our hikers would stay at Wortelfontein Guestfarm, but unfortunately they took the wrong turnoff. It is precisely at this point where they met Rachel.

“I will show you where Wortelfontein lies. One can easily get lost here,” says Rachel decidedly and points to the straight main road. She ties her baby skilfully behind her back with a towel and tackles the next 5 km together with our hikers.

“It is this kind of support and encouragement that keep us on the road,” says Adel.

Everywhere along the road people are stunned and concerned about the four’s trip and immediately offer their help.

Near Trompsburg, an elderly couple who just heard about the hikers at church, stop next to them and offer them a lift to the next town. They are thankful for the gesture, but have to decline the offer.

Between Trompsburg and Springfontein, Doug offers to take them to Springfontein. Once again they decline the offer.

There was also the uncle who wanted to buy them cool drink and the road workers who cheered them on.

In Colesberg a group of children asked worriedly: “Aren’t auntie and them hungry yet?”

These boots are made for walking ... to Cape Town (Article of 02 May 2014)

Daily updates:
(You can also follow us on @UFSweb for daily tweets)

Day 21: 21 May 2014
15:09
42 km
Leeu Gamka Hotel

Day 20: 20 May 2014
13:39
20 km
Alida, Springfontein

Day 19: 19 May 2014
12:31
27.6 km
Teri Moja Game Lodge

Day 18: 18 May 2014
First rest day
Nagenoeg Guesthouse, Beaufort West

Day 17: 17 May 2014
19:30
62.3 km
Nagenoeg Guesthouse, Beaufort West

Day 16: 16 May 2014
13:00
14 km
Taaibochfontein

Day 15: 15 May 2014
16:03
32 km
Travalia, Three Sisters

Day 14: 14 May 2014
18:33
43 km
Joalani Guest Farm

Day 13: 13 May 2014
17:30
33 km
Die Rondawels

Day 12: 12 May 2014
16:49
40 km
Aandrus B&B in Richmond

Day 11: 11 May 2014
39 km
Wortelfontein (Magdel and Christiaan)

Day 10: 10 May 2014
15:44
34 km
Hanover Lodge

Day 9: 09 May 2014
40.8 km
Camping between Colesberg and Hanover

Day 8: 08 May 2014
15:25
33.7 km
Colesberg, The Lighthouse Guesthouse

Day 7: 07 May 2014
15:08
23 km
Orange River Lodge

Day 6: 06 May 2014
15:57
51.06 km
Gariep Forever Resort

Day 5: 05 May 2014
12:18
28 km
Rondefontein

Day 4: 04 May 2014
15:27
35 km
Trompsburg: Fox Den

Day 3: 03 May 2014
17:30
46.74 km
Edenburg Country Lodge (Hotel)

Day 2: 02 May 2014
11:44 am
15.3 km
Tom's Place

Day 1: 01 May 2014
32 km
Leeuwberg

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