Natural Sciences
Emergence of a Viral Disease Epidemic of Sweet potato in Eastern Africa is Imminent – Plant virologists warn
When COVID-19 emerged in 2019, it first remained temporarily localized as an epidemic in Huan China until it broke Chinese national and Asian continental borders attaining a global pandemic status. With COVID-19 and other epidemics and/or pandemics of humans and livestock, it is easier to explain the obvious impact on humans and/or livestock.
What about virus epidemics and pandemics that affect plants?
Virus epidemics and pandemics that affect plants cause significant disruptions in food production. In fact, the emergence and re-emergence of extremely dangerous plant viruses is the major pain to the 21st century agriculture and sustainable food production.
Viral diseases of plants lead to complex outcomes of food shortages, economic meltdown and loss of lives especially when the affected crop plants are central to the economics and livelihoods of the people. Think of what would happen if an epidemic caused significant effect or eliminated crops like maize, banana, cassava or sweetpotato from sub-Saharan Africa.
Most viruses affecting livestock and humans are spread and transmitted by means of physical contact between hosts. Furthermore, human and livestock hosts are mobile. On the other hand, plants do not move and must thus depend on other agents (vectors) for the spread of viruses between hosts. Consequently, over 98% of plant viruses are transmitted by vectors. These vectors may include arthropods (especially insects), nematodes, fungi, and parasitic plants. In plants, a virus disease epidemic becomes optimized by the ability of vectors facilitating fast spread of the virus in an agro-ecosystem.
New study predicts emergence of disease epidemic in sweetpotato
A new study led by Prof. Arthur Tugume at the Department of Plant Sciences, Microbiology and Biotechnology in the College of Natural Sciences at Makerere University predicts potential of emergence of a new disease epidemic in sweetpotato.
The study recognizes that by default, viruses are not constrained to perpetually occupy a single ecological niche. This is because viruses have inherent genetic and evolutionary abilities that enable their acquisition of better fitness to always expand their host and geographical ranges.
While viruses enjoy such fitness advantages in nature, the current study points out unique examples where some viruses in eastern Africa behave awkwardly. These viruses first hid under the guise of being less important and seemingly of no impact in cropping systems, and all of a sudden hell broke loose and the entire farming system was caught unaware.
The study titled; “Endemism and reemergence potential of the ipomovirus Sweetpotato mild mottle virus (family Potyviridae) in Eastern Africa: half a century of mystery” shows that a virus, named Sweetpotato mild mottle virus (SPMMV) was first detected in eastern Africa in the 1970’s. SPMMV is currently the third most prevalent virus of sweepotato in the region and is most destructive in mixed infections with other viruses. Very strangely, SPMMV is geographically restricted to eastern Africa (confirmed only in Uganda, Kenya and Tanzania). This sharply contradicts other known sweetpotato viruses that occur globally wherever sweetpotato is grown.
According to Dr. Deusdedith Mbanzibwa a co-author and Head of Disease Control Unit at Tanzanian Agricultural Research Institute, “it is a half-century-old mystery how SPMMV remains localized in East Africa while other viruses on sweetpotato show a global incidence.” Dr. Mbanzibwa adds, “it is important we generate basic information on this virus as soon as possible such that immediately an epidemic explodes we can counter-it based on the information we have as opposed to being caught unaware of the destructive effects of an epidemic.”
Why should we be concerned about outbreak of an epidemic on sweetpotato?
Plant disease epidemics cause a breakdown in food production and availability in communities that depend on the affected plants as food staples. If sweetpotato production breaks down, it directly translates into limited food supplies in local communities that depend on it for food.
According to Dr. Titus Alicai, a senior virologist and co-author based at the National Crops Resources Research Institute (NaCRRI), Namulonge Uganda, “between the 1980’s-1990’s, a devastating viral pandemic (cassava mosaic disease, CMD) destroyed cassava cropping systems in eastern Africa. As a result, dozens of lives were lost because many communities solely depended on cassava for food and income”. Although these viruses had been detected in the region as early as 1800’s, it was not until the 1980s that destructive effects of the disease became apparent.
Dr. Alicai adds that, “when cassava got destroyed by CMD, sweetpotato became an immediate alternative to millions of hungry people, but now sweetpotato is also burdened with diseases arising from viruses.” Despite heavy investments in disease control in cassava, the CMD pandemic is not completely controlled.
Why is eastern Africa important with respect to emergence of plant viruses?
According to this study, SPMMV is not the first unique virus to emerge or reemerge in eastern Africa. An earlier study by Prof. Tugume and colleagues published in 2010 in Molecular Ecology showed that East Africa is a hotspot for the evolutionary diversification of yet another virus in sweetpotato, named Sweetpotato feathery mottle virus (SPFMV).
Many studies show this region as the home of epidemics in rice caused by Rice yellow mottle virus (RYMV). Highly lethal strains of Cassava mosaic geminiviruses (CMGs) causing CMD initiated this epidemic from eastern Africa. Unique strains of Sweetpotato chlorotic stunt virus (SPCSV) are incident in eastern Africa. SPCSV is unique because it almost indiscriminately enhances the viral concentrations of other co-infecting viruses in sweetpotato. The list of damaging plant viruses or their strains that have emerged from eastern African region is long and cannot not be exhausted here.
Biologists studying diversity of plants and animals have also coded eastern Africa as a home of the “hottest hotspot of biodiversity” of endemic land plants and animals located in Eastern Arc Mountains of Kenya and Tanzania. The features of eastern African ecosystem that incite virus epidemics in plants are not fully known. However, it is suspected that the microclimatic changes as modulated by the Indian Ocean dipole could be one of the drivers of virus emergence and reemergence in the region.
Emergence of SPMMV in sweetpotato closely resemble that of viruses in cassava
The current study specifically compared SPMMV with two viruses infecting cassava: cassava brown streak virus, and Ugandan cassava brown streak virus, collectively called cassava brown streak ipomoviruses (CBSIs).
CBSIs first appeared in the 1930’s in coastal east Africa but went completely silent for about 70 years and then suddenly re-emerged in late 1990’s-mid 2000’s to what is today the single largest threat to cassava production in Africa. CBSIs cause a disease called “cassava brown streak disease” (CBSD). Between 1930’s-1990’s, the CBSIs were able to “amass ability” to cause untold suffering of cassava cropping from 2000’s to-date.
Similarly, since the 1970’s when SPMMV was first reported in the region, the virus has been “amassing an ability” to cause more disease in sweetpotato. This is implied directly by evidence of positive selection found in its genes. Positive selection refers to “survival for the fittest” in Charles Darwin’s terms to mean that, individual virus particles in the SPMMV population are becoming more and more highly efficient in causing disease. Today, half a century later, one can argue that it is about time that the SPMMV will incite a new disease.
Note that both SPMMV and CBSIs belong to the same taxonomic grouping of plant viruses in a genus called “Ipomovirus”, and family called “Potyviridae” which is the largest family of plant viruses with RNA genomes. Hence, similarities in the disease spread between SPMMV and CBSIs are not unexpected.
Expert guide to sweetpotato virology research for preparations against the epidemic
“If we can generate advance basic scientific information concerning how the SPMMV infects sweetpotato plants, how it is transmitted by vectors between plants, and circumstances fostering field spread of the virus, we will be better prepared to handle an epidemic that may arise from the virus,” Prof. Tugume states.
He adds: “we should be able to undertake these studies quickly because SPMMV is naturally incident on sweetpotatoes in Uganda, Kenya and Tanzania in levels causing less damage on its own at the moment, although this damage escalates when the virus occurs in multiple infections.”
The co-authors highlight serious research gaps for critical research investment in sweetpotato virology. Vector transmission is such an important aspect of virus disease epidemics of plants. Therefore, this study has proposed three possible explanations to account for the virus-vector and virus-host relationships of SPMMV. These are called hypothesis #1, #2, and #3, built in a fashion that allows experimentation to prove them right or wrong:
- Hypothesis #1: “SPMMV is opportunistically aphid-transmitted with potyvirus SPFMV as a helper virus.” This hypothesis postulates that SPMMV is transmitted by “chance” by a group of insects called aphids but this happens when SPMMV co-infects sweetpotatoes with another virus, SPFMV that is transmitted efficiently by aphids.
- Hypothesis #2: “Vector-mediated transmission of SPMMV is modulated by synergism with SPCSV.” Under this hypothesis, the concentrations of SPMMV in plant tissues increases when it co-infects with another virus, SPCSV, and this increases chances of SPMMV being picked by insects for transmission to other plants.
- Hypothesis #3: “SPMMV tropism and histo-localization changes upon co-infection with SPCSV.” How much viral concentration is found in different plant tissues can change depending on which tissues that are preferred by the virus. Certain plant viruses prefer to stay and multiply from certain tissues than others.
Dr. Alicai said, “If we can determine vector transmission dynamics including the actual vector(s) transmitting SPMMV, which plant tissues the virus prefers for its multiplication, and generate many complete sequences of SPMMV genomes, we will be better prepared for epidemics arising from the emergence of SPMMV”.
Sweetpotato is a vegetatively propagated plant in which the top-most 15-40cm part of the plant is used for initiating the new crop, a practice that is the main route of accelerated of virus spread in the cropping system. Also, insects especially aphids and whiteflies are the major vectors transmitting viruses in sweetpotato. The research gaps highlighted with respect to SPMMV require urgent attention for advance preparation in case an epidemic breaks loose on the sweetpotato cropping system.
This study has been published by the American Phytopathological Society (APS) in an open access journal, “Phytobiomes Journal”, and is freely accessible on https://apsjournals.apsnet.org/doi/10.1094/PBIOMES-05-22-0031-RVW
For more details, please contact;
Prof. Arthur Tugume
Lead Scientist
Department of Plant Sciences, Microbiology and Biotechnology
College of Natural Sciences (CoNAS)
Makerere University
Email: arthur.tugume@mak.ac.ug
Tel: +256772514841
Dr. Deusdedith Mbanzibwa
Tanzania Agricultural Research Institute (TARI),
Biosciences Centre, Dodoma, Tanzania
Email: d.mbanzibwa@yahoo.co.uk
Email: Tel: +255755881758
Dr. Titus Alicai
Root Crops Research Program
National Crops Resources Research Institute (NaCRRI)
National Agricultural Research Organization (NARO)
Email: talicai@hotmail.com
Tel: +256772970585
Hasifa Kabejja
Principal Communication Officer
College of Natural Sciences
Makerere University
Email: pr.cns@mak.ac.ug
Tel: +256774904211
Natural Sciences
Enhancing Experiential Learning: ZPEB Uganda Donates Well Control System Demonstration Model to Mak’s Department of Geology & Petroleum Studies
ZPEB Uganda Co. Limited has donated a Well Control System Demonstration Model to the Department of Geology and Petroleum Studies at Makerere University, a contribution expected to significantly enhance practical training, research, and industry-oriented learning in petroleum geoscience and drilling engineering.
The equipment was officially handed over to Makerere University at a ceremony held on 5th August 2026 at Onomo Hotel Kampala. The event was attended by Makerere University Vice Chancellor, Prof. Barnabas Nawangwe, alongside representatives from the Department of Geology and Petroleum Studies led by the Head, Dr John Mary Kiberu.
The Well Control System Demonstration Model is an advanced educational training tool designed to provide students with practical understanding of well control principles, equipment operation, and safety procedures applied during drilling operations. Although it is not intended for field deployment, the model offers a realistic representation of the systems and processes used in the prevention and management of well control incidents, including blowouts, enabling students to acquire practical experience within a safe learning environment.
The equipment will significantly enhance students’ understanding of well control systems by providing practical demonstrations of pressure management techniques and strengthening their competencies in kick detection, well control procedures, drilling safety, and emergency response.
By integrating practical demonstrations into petroleum education, the model will contribute to the development of highly skilled graduates equipped with the technical knowledge and practical capabilities required to support Uganda’s emerging oil and gas industry.
ZPEB Uganda Co. Limited, the donor of the equipment, is the Ugandan subsidiary of Zhongyuan Petroleum Exploration Bureau (ZPEB), a globally recognized Chinese drilling contractor with extensive expertise in oil and gas exploration, drilling, cementing, and engineering services. The company has been actively involved in supporting petroleum exploration and development activities in Uganda while contributing to capacity building within the country’s oil and gas sector.
The Department of Geology and Petroleum Studies at Makerere University continues to play a pivotal role in developing professionals who contribute to the sustainable exploration and management of natural resources. Through its undergraduate and postgraduate programmes, the Department equips students with comprehensive knowledge and practical skills in geology, petroleum systems, exploration methods, reservoir characterization, and production technologies.
Natural Sciences
CoNAS Orientation: First Year Students Urged to Lay Strong Foundation for Academic & Professional Success
First Year students admitted to the College of Natural Sciences (CoNAS) at Makerere University for the Academic Year 2026/2027 have been encouraged to remain focused on their studies, embrace the opportunities available at the University, and lay a strong foundation for successful academic and professional careers.
The call was made during the orientation ceremony held on 5th August 2026 at the College premises. The session introduced the students to university life and policies, academic expectations, support services, and the diverse opportunities available within the College and University, helping them make a smooth transition from secondary school to higher education.
The orientation was attended by the College Management led by the Principal, Prof. Winston Tumps Ireeta, the Deputy Principal, Prof. Juma Kasozi, Deans, Heads of Departments, academic staff, and representatives from various University administrative units.
Welcoming the students, the Principal, Prof. Winston Tumps Ireeta, congratulated them on securing admission to one of Uganda’s leading science colleges and encouraged them to take full advantage of the opportunities available at the University.
“CoNAS is internationally recognized for excellence in teaching, research, and innovation. Supported by highly qualified academic staff, 95 per cent of whom are PhD holders, the College provides high-quality education, equipping students with the knowledge, skills, and global perspectives needed to excel in an increasingly competitive world.”
Prof. Ireeta urged the students to approach university life with discipline and commitment from the outset, encouraging them to attend lectures consistently and develop effective study habits that would enable them to excel academically. While acknowledging that university life presents many social opportunities, he advised the students to maintain a healthy balance between academics and extracurricular activities.
The Deputy Principal, Prof. Juma Kasozi, challenged the students to take personal responsibility for their learning and professional development. He encouraged them to cultivate a culture of discipline, curiosity, and continuous learning, emphasizing that academic success is achieved through consistent effort rather than last-minute preparation.
He equally advised the students to attend all lectures, actively participate in all academic activities, and develop strong computer and statistical skills – competencies that are increasingly vital for success across scientific disciplines and in today’s evolving workplace.
He also urged the students to uphold academic integrity, manage their time effectively, and seek guidance whenever they encounter academic or personal challenges.
The Deans introduced students to the departments and academic programmes within their respective Schools, explaining programme structures, academic expectations, career prospects, and the support systems available to facilitate student success. They encouraged the students to take advantage of the mentorship opportunities offered by academic staff.
Addressing the students, the Acting Dean, School of Biosciences, also Head of the Department of Zoology, Entomology and Fisheries Sciences, Dr. Godfrey Kawooya Kubiriza, encouraged the students to embrace the programmes to which they were admitted, noting that each programme offers unique opportunities for learning, research, innovation, and career growth. “Success depends more on commitment, dedication, and hard work than on the title of one’s degree programme.” Dr. Kubiriza reminded the students that, while university life provides greater freedom and independence, it also requires a strong sense of responsibility, self-discipline, and effective time management to achieve academic success.
The Dean of the School of Physical Sciences, Prof. David Ssevviiri, underscored the critical role that science graduates play in driving national development through research, innovation, and technological advancement. He encouraged students to maximize the opportunities available within the School and urged them to adopt a finalist mindset from their very first semester by setting high academic standards and remaining committed to excellence throughout their academic journey.
Ms. Barbra Akello and Mr. Ivan Ocen shared practical insights on strategies for achieving a good CGPA. They encouraged students to take personal responsibility for their academic success by embracing self-directed excellence, setting clear academic goals, and developing effective study habits from the beginning of their university journey. They advised students to actively engage with lecturers, seek academic guidance whenever necessary, and build supportive study networks. They emphasized that consistent effort, early preparation, discipline, and a focused approach to learning are key foundations for attaining good grades and succeeding at the university.
Students also received comprehensive guidance on academic procedures and University regulations from representatives of the College Registrar’s Office, Ms. Hellen Mirembe and Ms. Hasifa Mukyala. They explained key processes relating to admission, registration, enrolment, progression requirements, examinations, academic appeals, and withdrawal procedures, while emphasizing the importance of honesty, integrity, and compliance with the University regulations. The students were also sensistized on the library services and fees payment policy.
The Deputy Director of the Institute of Open, Distance and e-Learning (IODeL), Dr. Godfrey Mayende, introduced students to the University’s digital learning environment. He demonstrated how students can effectively utilize the Makerere University Electronic Learning Environment (MUELE) to access course materials, submit assignments, and interact with lecturers. He also encouraged responsible and ethical use of Artificial Intelligence (AI) tools to support learning while observing the University’s academic integrity policies.
Representatives from the Gender Mainstreaming Directorate, the Counseling and Guidance Centre, and the Emerging Leaders’ Programme introduced students to institutional support services aimed at fostering academic success, personal growth, and wellbeing. They emphasized the availability of guidance, mentorship, and leadership development opportunities to help students effectively navigate university life and make informed decisions throughout their academic journey.
Photos of the orientation ceremony: https://drive.google.com/drive/folders/1eGEb6tAYcr15qQHIuV-Imgclu9sueOk7?usp=sharing
As the world of work continues to evolve, employers are increasingly seeking graduates who possess not only theoretical knowledge but also practical skills, problem-solving abilities, creativity, digital competence, and the ability to adapt to the rapidly changing technological and professional environments. In response to these demands, Uganda is embracing Competency-Based Education and Training (CBET), an approach that emphasizes the practical application of knowledge and skills needed to perform effectively in real-world settings.
Following the introduction of the Competency-Based Curriculum in secondary schools in 2019, the Ministry of Education and Sports directed institutions of higher learning to transition to competency-based education by 2027. The reform requires universities to redesign their curricula, adopt learner-centred teaching methods, strengthen practical training, and implement authentic assessment approaches that prepare graduates for both formal and informal employment.
Building Capacity for Competency-Based Education
In support of this national transition, Makerere University is strengthening the capacity of its staff to develop and implement competency-based programmes. From 21st to 23rd July 2026, the College of Natural Sciences (CoNAS) conducted a three-day capacity-building training for academic and technical staff to deepen their understanding of CBET principles and equip them with the skills required to design, deliver, and assess competency-based curricula.
Held at Ridar Hotel in Seeta, the training was conducted with support from the Strengthening Commercial Aquaculture (SCA) Programme, funded by the Embassy of the Kingdom of the Netherlands in Kampala (EKN) and implemented by the COFAD Consortium (COFAD–ThinkAqua–WUR). The programme is also supporting the Department of Zoology, Entomology and Fisheries Sciences (ZEFS) to review its undergraduate and postgraduate aquaculture programmes to align them with competency-based education and the evolving needs of Uganda’s growing commercial aquaculture sector.
The transition of ZEFS programmes to CBET presents a strategic opportunity for Makerere University to develop a flagship model for science-based competency-based education that could inform implementation across the University.
The Training Workshop
Officially opened by the Deputy Principal of the College of Natural Sciences (CoNAS), Prof. Juma Kasozi, the training was attended by staff from the Departments of Zoology, Entomology and Fisheries Sciences; Plant Sciences; Microbiology and Biotechnology; Biochemistry and Systems Biology; Exercise and Sports Science; and Chemistry. It was coordinated by Dr. Godfrey Kawooya Kubiriza, Head of the Department of Zoology, Entomology and Fisheries Sciences and one of the coordinators of the Competency-Based Education and Training (CBET) Programme at Makerere University.
The facilitators included Mr. Joshua Kunya, TVET Specialist and Training Consultant; Mr. Richard Basalirwa, an associate consultant and process expert with Skills Initiative Uganda; Dr. Cyprian Misinde, Director of Quality Assurance at Makerere University; and Mr. Maurice Ssebisubi, Lead Consultant for the Diagnostic and Rapid Needs Assessment of the BSc Fisheries and Aquaculture and MSc Zoology (Fisheries and Aquaculture) curricula at Makerere University.
Throughout the training, participants explored the principles of competency-based education and examined how universities can move beyond traditional knowledge transmission towards teaching and learning approaches that develop and improve practical competence, critical thinking, innovation, teamwork, communication, ethical leadership, digital literacy, and entrepreneurship.
Presentations also examined Makerere University’s curriculum development framework, emphasizing the importance of aligning academic programmes with national quality assurance standards, labour market demands, and international best practices. Participants underscored the need for curriculum reform to be informed by industry requirements and designed to produce graduates who can effectively apply their knowledge and skills in professional, entrepreneurial, and community settings.
Recommendations from the Diagnostic Assessment of the BSc & MSc Fisheries & Aquaculture
A key highlight of the training was the presentation of findings from a diagnostic assessment of the Bachelor of Science in Fisheries and Aquaculture and the Master of Science in Zoology (Fisheries and Aquaculture) programmes, conducted under the leadership of Mr. Maurice Ssebisubi. The assessment involved curriculum reviews, surveys of alumni and students, and consultations with employers and other stakeholders. It found that, although the programmes provide a strong scientific foundation, they require further strengthening to fully meet the requirements of competency-based education.
The assessment identified several gaps, including limited opportunities for practical and workplace learning, inadequate digital competencies, insufficient enterprise and business management skills, heavy reliance on end-of-semester examinations, and learning outcomes that place greater emphasis on knowledge acquisition than on the demonstration of competence.
To address these gaps, the assessors recommended revising learning outcomes, strengthening partnerships with industry, expanding supervised workplace learning, integrating digital technologies, modernising technical content, and adopting continuous competency-based assessment approaches.
Programme Review
During the practical sessions, participants worked in departmental groups to review existing curricula and redesign programme objectives, learning outcomes, teaching strategies, and assessment methods in line with CBET principles. These collaborative exercises enabled staff to begin developing curricula that are more learner-centred, industry-responsive, and aligned with Uganda’s national development priorities.
Participants identified several institutional requirements for the successful implementation of CBET, including increased investment in infrastructure and teaching resources, continuous staff development, strengthened quality assurance systems, and closer collaboration with industry.
While acknowledging that the transition to competency-based education will require significant institutional commitment and resources, participants noted that it presents an important opportunity to enhance graduate employability, foster innovation, strengthen industry linkages, and increase the contribution of universities to Uganda’s socio-economic development.
SCA Programme Reaffirms Support for Aquaculture Education
Speaking at the training, David Bargh, Team Leader of the Strengthening Commercial Aquaculture (SCA) Programme, reaffirmed the programme’s commitment to supporting Makerere University in strengthening aquaculture education and aligning its programmes with the evolving needs of the sector.
“A strong aquaculture sector requires skilled professionals. This is why curriculum reform is so important. Competency-based education focuses not only on what students know, but also on what they can do. Your role as lecturers and technicians is therefore central to producing graduates who are practical, innovative, and equipped to contribute meaningfully to Uganda’s aquaculture development.”
Appreciation to the funders
Addressing the participants, Prof. Juma Kasozi, Deputy Principal of (CoNAS), appreciated the funders for the support towards strengthening the quality, relevance, and impact of university education. He emphasized that Makerere University occupies a unique position in Africa’s academic landscape and therefore has a responsibility to remain responsive to the changing needs of society and the world of work. While acknowledging the University’s achievements and long-standing contribution to higher education, he noted that the rapidly changing social, economic, technological, and professional environment requires universities to rethink how they prepare graduates for the future. “Students should leave the university with more than academic qualifications – they should possess the practical skills, competencies, creativity, critical thinking, and problem-solving abilities needed to apply their knowledge effectively in the workplace and contribute meaningfully to national development.”
Dr. Godfrey Kawooya Kubiriza, Coordinator of the training and the CBET Programme equally appreciated the funders for the support. He underscored the need for staff to embrace the shift in mindset required by CBET, noting that successful implementation will depend on the ability of lecturers and technical staff to move beyond traditional approaches to teaching and assessment. He expressed optimism that the training would provide a strong foundation for the participating departments to develop and implement programmes that respond effectively to the changing needs of students, employers, industry, and society.
Photo highlights from Day One of the training: https://drive.google.com/drive/folders/1DZ_yEI2008uGo48C7hRyBZO8Dimxi_ky?usp=sharing
Photo highlights from Day Two and Three: https://drive.google.com/drive/folders/1XvsM3yggYG7FKX30binqpITB0wPBulhQ?usp=sharing
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