Economy
Rice Farmers Lose $200m Yearly to Parasitic Weeds
By Dipo Olowookere
An international team of researchers representing the Africa Rice Center (AfricaRice), the International Rice Research Institute (IRRI) and Wageningen University, has raised the alarm over the enormous economic impact of parasitic weeds on rice production in Africa, threatening the food security and livelihoods of millions of resource-poor rice farmers and consumers in the region.
Smallholder farmers in the continent are losing every year half a million tons of rice worth about US $200 million because of parasitic weeds.
This is roughly equivalent to the annual rice consumption of Liberia, a low-income country, which is highly dependent on rice imports.
If the rice lost due to the parasitic weeds had been saved, it would have been enough to feed the total population of Liberia (4.5 million people) for a whole year.
Parasitic weeds are among the most destructive and problematic weeds to control.
“When these plants invade food crops, they turn into ferocious weeds,” said Dr Jonne Rodenburg, Agronomist at AfricaRice.
The most important parasitic weed species in rice are Striga asiatica, S. aspera, S. hermonthica and Rhamphicarpa fistulosa. They are all endemic to Africa and can also parasitize other cereal crops like maize, sorghum and millet.
The team of researchers reveal that these parasitic weeds, which survive by siphoning off water and nutrients from host crops, have invaded 1.34 million hectares of rainfed rice in Africa, affecting an estimated 950,000 rural households. They are increasingly becoming severe due to an intensification of agricultural production and climate changes.
The areas affected by parasitic weeds are home to some of the world’s poorest farmers.
Studies by AfricaRice and partners have shown that parasitic weeds seem to predominantly affect women farmers in Africa as they are often forced to grow rice on the most marginal and parasitic weed-infested plots.
Parasitic weeds threaten rice production in at least 28 countries in Africa that have rainfed rice systems. The most affected countries are Burkina Faso, Cameroon, Côte d’Ivoire, Guinea, Madagascar, Mali, Nigeria, Sierra Leone Tanzania and Uganda.
The researchers warn that these parasites are spreading fast in the rainfed rice area and if nothing is done to stop them in their tracks, the damage will increase by about US $30 million a year.
These findings were revealed in a recent article by Rodenburg, Demont, Zwart and Bastiaans, entitled “Parasitic weed incidence and related economic losses in rice in Africa,” published in Agriculture, Ecosystems and Environment 235 (306-317).
Rice is the second most important source of calories in Africa. It is also critical for smallholder incomes. Demand for rice is growing at a rate of more than 6% per year – faster than for any other food staple in sub-Saharan Africa (SSA), because of changes in consumer preferences and urbanization. Rice production is increasing across SSA, but the continent still imports some 40% of its rice.
Until now, there has been little information on the regional spread and economic importance of parasitic weeds in rice in Africa. “We have presented in this article best-bet estimates on the distribution as well as the agronomic and economic impact of parasitic weeds in rice in Africa,” explained Dr Rodenburg. “In fact, this is the first multi-species, multi-country impact assessment of parasitic weeds in Africa.”
The article focuses on the four most important parasitic weeds in rice. Striga species – known under the common name “witchweed” – occur in at least 31 countries with rain-fed upland rice systems. Rhamphicarpa fistulosa – known under the common name “rice vampireweed” – threatens rice production in at least 28 countries with rainfed lowland rice systems.
Dr Sander Zwart, AfricaRice Remote sensing and Geographic information systems specialist, explained that for this study, a map of rainfed rice production areas, compiled from different databases, was overlapped with parasitic weed observation data retrieved from public herbaria to visualize regional distribution of these four important parasitic weeds.
From this overlap, probabilities of actual infestation were estimated. These estimates together with secondary data on parasite-inflicted crop losses and efficacy of weed control were combined into a stochastic impact assessment model.
The knowledge acquired on the distribution as well as the agronomic and economic impact of parasitic weeds in rice in Africa underlines the importance of finding effective measures to control these pests through research.
AfricaRice and its partners have been investigating and developing efficient parasitic weed management strategies that are affordable and feasible for resource-poor rice farmers. “A range of high-yielding, short-cycle, farmer-preferred rice varieties have been identified with resistance or tolerance to different species and ecotypes of Striga, as well as varieties with good defense against R. fistulosa,” said Dr Rodenburg.
He explained that such varieties can be combined with different agronomic measures, such as late sowing (against R. fistulosa) or early sowing (against Striga), and the use of organic soil fertility amendments. Growing a leguminous cover crop such as Stylosanthes guianensisand following a zero-tillage approach also contribute to effective control of Striga, as demonstrated by agronomic experiments conducted by AfricaRice and its partners.
To study institutional and socio-economic constraints underlying the challenge posed by the parasitic weeds, and to raise awareness and improve communication on efficient management strategies, AfricaRice and its partners have brought together stakeholders, including national research institutes, extension services, crop protection services and private sector representatives in workshops in East and West Africa.
At a time where there is a decline in public sector investments in agricultural research, efficient targeting of resources is becoming increasingly important. “The results of our studies emphasize the importance of targeted investments in further research, the development and dissemination of control technologies and capacity building of farmers, extension agents and other stakeholders, to reverse the observed trend of increasing parasitic weeds in rice,” stated Dr Rodenburg.
AfricaRice.
By Adedapo Adesanya
The United Kingdom via the British High Commission in Abuja has launched two flagship economic reform programmes – the Nigeria Economic Stability & Transformation (NEST) programme and the Nigeria Public Finance Facility (NPFF) -as part of efforts to support Nigeria’s economic reform and growth agenda.
Backed by a £12.4 million UK investment, NEST and NPFF sit at the centre of the UK-Nigeria mutual growth partnership and support Nigeria’s efforts to strengthen macroeconomic stability, improve fiscal resilience, and create a more competitive environment for investment and private-sector growth.
Speaking at the launch, Cynthia Rowe, Head of Development Cooperation at the British High Commission in Abuja, said, “These two programmes sit at the heart of our economic development cooperation with Nigeria. They reflect a shared commitment to strengthening the fundamentals that matter most for our stability, confidence, and long-term growth.”
The launch followed the inaugural meeting of the Joint UK-Nigeria Steering Committee, which endorsed the approach of both programmes and confirmed strong alignment between the UK and Nigeria on priority areas for delivery.
Representing the Government of Nigeria, Special Adviser to the President of Nigeria on Finance and the Economy, Mrs Sanyade Okoli, welcomed the collaboration, touting it as crucial to current, critical reforms.
“We welcome the United Kingdom’s support through these new programmes as a strong demonstration of our shared commitment to Nigeria’s economic stability and long-term prosperity. At a time when we are implementing critical reforms to strengthen fiscal resilience, improve macroeconomic stability, and unlock inclusive growth, this partnership will provide valuable technical support. Together, we are laying the foundation for a more resilient economy that delivers sustainable development and improved livelihoods for all Nigerians.”
On his part, Mr Jonny Baxter, British Deputy High Commissioner in Lagos, highlighted the significance of the programmes within the wider UK-Nigeria mutual growth partnership.
“NEST and NPFF are central to our shared approach to strengthening the foundations that underpin long-term economic prosperity. They sit firmly within the UK-Nigeria mutual growth partnership.”
By Aduragbemi Omiyale
A strategic partnership aimed at accelerating the growth, digital capacity, and sustainability of Nigeria’s 40 million Micro, Small and Medium Enterprises (MSMEs) has been signed by MTN Nigeria and the Small and Medium Enterprises Development Agency of Nigeria (SMEDAN).
The collaboration will feature joint initiatives focused on digital inclusion, financial access, capacity building, and providing verified information for MSMEs.
With millions of small businesses depending on accurate guidance and easy-to-access support, MTN and SMEDAN say their shared platform will address gaps in communication, misinformation, and access to opportunities.
At the formal signing of the Memorandum of Understanding (MoU) on Thursday, November 27, 2025, in Lagos, the stage was set for the immediate roll-out of tools, content, and resources that will support MSMEs nationwide.
The chief operating officer of MTN Nigeria, Mr Ayham Moussa, reiterated the company’s commitment to supporting Nigeria’s economic development, stating that MSMEs are the lifeline of Nigeria’s economy.
“SMEs are the backbone of the economy and the backbone of employment in Nigeria. We are delighted to power SMEDAN’s platform and provide tools that help MSMEs reach customers, obtain funding, and access wider markets. This collaboration serves both our business and social development objectives,” he stated.
Also, the Chief Enterprise Business Officer of MTN Nigeria, Ms Lynda Saint-Nwafor, described the MoU as a tool to “meet SMEs at the point of their needs,” noting that nano, micro, small, and medium businesses each require different resources to scale.
“Some SMEs need guidance, some need resources; others need opportunities or workforce support. This platform allows them to access whatever they need. We are committed to identifying opportunities across financial inclusion, digital inclusion, and capacity building that help SMEs to scale,” she noted.
Also commenting, the Director General of SMEDAN, Mr Charles Odii, emphasised the significance of the collaboration, noting that the agency cannot meet its mandate without leveraging technology and private-sector expertise.
“We have approximately 40 million MSMEs in Nigeria, and only about 400 SMEDAN staff. We cannot fulfil our mandate without technology, data, and strong partners.
“MTN already has the infrastructure and tools to support MSMEs from payments to identity, hosting, learning, and more. With this partnership, we are confident we can achieve in a short time what would have taken years,” he disclosed.
Mr Odii highlighted that the SMEDAN-MTN collaboration would support businesses across their growth needs, guided by their four-point GROW model – Guidance, Resources, Opportunities, and Workforce Development.
He added that SMEDAN has already created over 100,000 jobs within its two-year administration and expects the partnership to significantly boost job creation, business expansion, and nationwide enterprise modernisation.
By Adedapo Adesanya
The Nigerian Exchange (NGX) Limited is seeking review of the controversial Capital Gains Tax increase, fearing it will chase away foreign investors from the country’s capital market.
Nigeria’s new tax regime, which takes effect from January 1, 2026, represents one of the most significant changes to Nigeria’s tax system in recent years.
Under the new rules, the flat 10 per cent Capital Gains Tax rate has been replaced by progressive income tax rates ranging from zero to 30 per cent, depending on an investor’s overall income or profit level while large corporate investors will see the top rate reduced to 25 per cent as part of a wider corporate tax reform.
The chief executive of NGX, Mr Jude Chiemeka, said in a Bloomberg interview in Kigali, Rwanda that there should be a “removal of the capital gains tax completely, or perhaps deferring it for five years.”
According to him, Nigeria, having a higher Capital Gains Tax, will make investors redirect asset allocation to frontier markets and “countries that have less tax.”
“From a capital flow perspective, we should be concerned because all these international portfolio managers that invest across frontier markets will certainly go to where the cost of investing is not so burdensome,” the CEO said, as per Bloomberg. “That is really the angle one will look at it from.”
Meanwhile, the policy has been defended by the chairman of the Presidential Fiscal Policy and Tax Reforms Committee, Mr Taiwo Oyedele, who noted that the new tax will make investing in the capital market more attractive by reducing risks, promoting fairness, and simplifying compliance.
He noted that the framework allows investors to deduct legitimate costs such as brokerage fees, regulatory charges, realised capital losses, margin interest, and foreign exchange losses directly tied to investments, thereby ensuring that they are not taxed when operating at a loss.
Mr Oyedele also said the reforms introduced a more inclusive approach to taxation by exempting several categories of investors and transactions.
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