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
A 74 Kobo or 0.05 per cent decline was recorded by the Naira against the United States Dollar in the Nigerian Autonomous Foreign Exchange Market (NAFEX) on Wednesday, February 25, trading at N1,356.11/$1 compared with the N1,355.37/$1 it was traded on Tuesday.
The Nigerian currency also further depreciated against the Pound Sterling during the session in the official market by N6.70 to settle at N1,834.96/£1 versus the preceding day’s rate of N1,828.26/£1, and against the Euro, it tumbled by N4.94 to quote at N1,598.59/€1 compared with the previous session’s N1,596.36/€1.
In the same vein, the Nigerian Naira lost N6 against the Dollar at the GTBank forex desk to close at N1,367/$1, in contrast to N1,361/$1 it was exchanged a day earlier, and in the parallel market, it traded flat at N1,365/$1.
The continuation of the decline of the local currency has been tied to the Central Bank of Nigeria (CBN) buying US Dollars from the market to slow the rapid rise of the Naira.
The apex bank bought about $189.80 million to reduce excess Dollar supply and control how fast the Naira was gaining value.
The monetary policy committee (MPC) of the CBN on Tuesday reduced interest rates by 50 basis points to 26.50 per cent from 27 per cent after inflation eased in January 2026, a move analysts say is the best not to unsettle FX market, especially the Foreign Portfolio Investors (FPI_ inflows which have anchored much of the recent supply and weakened the recently restored monetary credibility.
“The 50bps move therefore provides a clear directional signal while still keeping overall monetary conditions restrictive, indicating the start of a shallow, data-dependent easing cycle rather than a radical shift to accommodative policy,” said Mr Kayode Akindele, CEO, Coronation Capital and Head, Coronation Research in an email.
As for the cryptocurrency market, benchmarked tokens rebounded in double digits, driven by bearish positioning and thin liquidity rather than by clear fundamental catalysts, with Cardano (ADA) growing by 16.2 per cent to $0.3015, and Solana (SOL) appreciating by 12.3 per cent to $88.66.
Further, Ethereum (ETH) surged 11.9 per cent to $2,076.66, Litecoin (LTC) expanded by 11.5 per cent to $57.15, Dogecoin (DOGE) rose by 11.5 per cent to $0.1025, Binance Coin (BNB) advanced by 7.6 per cent to $629.76, Ripple (XRP) jumped 7.2 per cent to $1.45, and Bitcoin (BTC) added 6.4 per cent to sell for $68,136.72, while the US Dollar Tether (USDT) and the US Dollar Coin (USDC) remained unchanged at $1.00 apiece.
By Adedapo Adesanya
Oil prices settled largely unchanged on Wednesday amid a build in American crude stockpile and the threat to oil supply from potential military conflict between the US and Iran.
Brent futures chalked up 8 cents to trade at $70.85 a barrel, while the US West Texas Intermediate (WTI) futures settled lost 21 cents to close at $65.42 per barrel.
Crude oil inventories in the US increased by 16 million barrels during the week ending February 20, according to new data from the US Energy Information Administration (EIA) released on Wednesday.
The decrease brings commercial stockpiles to 435.8 million barrels according to government data, which is still 3% below the five-year average for this time of year.
The EIA’s data release follows figures by the American Petroleum Institute (API) that were released a day earlier, which reported that crude oil inventories rose by a massive 11.4 million barrels in the period.
The market continued to weigh the possibility extended conflict could disrupt supplies from Iran, the third-biggest crude producer in the Organisation of the Petroleum Exporting Countries (OPEC) and other countries in the Middle East.
US President Donald Trump verbally attacked Iran, saying he would not allow a country he described as the world’s biggest sponsor of terrorism to have a nuclear weapon.
This comes as US envoys are due to meet an Iranian delegation for a third round of talks on Thursday in Geneva, Switzerland.
Reuters reported that OPEC+ is considering raising its oil output by 137,000 barrels per day for April to end a three-month pause in production increases. This is as the group prepares for peak summer demand and tensions between the US and Iran boost prices.
Eight OPEC+ producers – Saudi Arabia, Russia, the United Arab Emirates, Kazakhstan, Kuwait, Iraq, Algeria and Oman – meet on March 1.
An increase of 137,000 barrels per day for April would be the same as those agreed for December, November and October last year.
In a separate development, Saudi Arabia has activated a plan for a short-term oil output and export surge in case a US strike on Iran disrupts flows from the Middle East, said two sources familiar with the Saudi plan.
Tariff uncertainty also further worried investors after President Trump’s temporary global tariff of 10 per cent took effect on Tuesday after the Supreme Court’s sweeping ruling last week. He later said the levy would be 15 per cent, but it was unclear when and if it would apply.
By Modupe Gbadeyanka
All individual taxpayers in Lagos State have been advised to file their annual tax returns ahead of the March 31 deadline.
This appeal was made by the Lagos State Internal Revenue Service (LIRS) in a statement issued by its Head of Corporate Communications, Mrs Monsurat Amasa-Oyelude.
The notice quoted the chairman of LIRS, Mr Ayodele Subair, as saying that timely filing remains both a constitutional and statutory obligation as well as a civic responsibility.
The statutory filing requirement applies to all taxable persons, including self-employed individuals, business owners, professionals, persons in the informal sector, and employees under the Pay-As-You-Earn (PAYE) scheme.
In accordance with Section 24(f) of the 1999 Constitution of the Federal Republic of Nigeria, Sections 13 &14(3) of the Nigeria Tax Administration Act 2025 (NTAA), every individual with taxable income is required to submit a true and correct return of total income from all sources for the preceding year (January 1 to December 31, 2025) within 90 days of the commencement of a new assessment year.
“Filing of annual tax returns is not optional. It is a legal requirement under the Nigeria Tax Administration Act 2025. We encourage all Lagos residents earning taxable income to file early and accurately.
“Early and accurate filing not only ensures full adherence with statutory requirements, but supports effective monitoring and forecasting, which are critical to Lagos State’s fiscal planning and long-term sustainability,” Mr Subair stated.
He further noted that failure to file returns by the statutory deadline attracts administrative penalties, interest, and other enforcement measures as prescribed by law.
To enhance convenience and efficiency, all individual tax returns must be submitted electronically via the LIRS eTax portal at https://etax.lirs.net. The platform enables taxpayers to register, file returns, upload supporting documents, and manage their tax profiles securely from anywhere.
In keeping with global best practices, Mr Subair reiterated that LIRS continues to prioritise digital tax administration and taxpayer support services. He affirmed that the LIRS eTax platform is secure and accessible worldwide. Taxpayers requiring assistance may visit any of the LIRS offices or other channels.
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