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
Nigeria’s crude oil production slipped slightly to 1.422 million barrels per day in December 2025 from 1.436 million barrels per day in November, according to data from the Organisation of Petroleum Exporting Countries (OPEC).
OPEC in its Monthly Oil Market Report (MOMR), quoting primary sources, noted that the oil output was below the 1.5 million barrels per day quota for the nation.
The OPEC data indicate that Nigeria last met its production quota in July 2025, with output remaining below target from August through December.
Quarterly figures reveal a consistent decline across 2025; Q1: 1.468 million barrels per day, Q2: 1.481 million barrels per day, Q3: 1.444 million barrels per day, and 1.42 million barrels per day in Q4.
However, the cartel acknowledged that despite the gradual decrease in oil production, Nigeria’s non-oil sector grew in the second half of last year.
The organisation noted that “Nigeria’s economy showed resilience in 2H25, posting sound growth despite global challenges, as strength in the non-oil economy partly offset slower growth in the oil sector.”
According to the report, cooling inflation, a stronger Naira, lower refined fuel imports, and stronger remittance inflows are improving domestic and external conditions.
“A stronger naira, easing food prices due to the harvest, and a cooling in core inflation also point to gradually fading underlying pressures”, the report noted.
It forecast inflation to decelerate further on the back of past monetary tightening, currency strength, and seasonal harvest effects, though it noted that monetary policy remains restrictive.
“Seasonally adjusted real GDP growth at market prices moderated to stand at 3.9%, y-o-y, in 3Q25, down from 4.2% in 2Q25. Nonetheless, this is still a healthy and robust growth level, supported by strengthening non-oil activity, with growth in that segment rising by 0.3 percentage points to 3.9%, y-o-y. Inflation continued to decelerate in November, with headline CPI falling for an eighth straight month to 14.5%, y-o-y, following 16.1%, y-o-y, in October”.
OPEC, however, stated that while preserving recent disinflation gains is important, the persistently high policy rate – implying real interest rates of around 12% – risks weighing on aggregate demand in the near term.
By Aduragbemi Omiyale
The National Bureau of Statistics (NBS) on Thursday revealed that inflation rate for December 2025 stood at 15.15 per cent compared with the 14.45 per cent it put the previous month.
However, it recalculated the November 2025 inflation rate at 17.33 per cent after using a 12-month index reference period where the average consumer price index (CPI) for the 12 months of 2024 is equated to 100. This is a departure from the single-month index reference period, in which December 2024 was set to 100, which would have produced an artificial spike in the December 2025 year-on-year inflation rate.
The NBS had earlier informed stakeholders a few days ago that it was changing its methodology for inflation to reflect the economic reality. This is coming after the organisation changed the base year from 2009 to 2024 earlier in 2025.
In its report released today, the stats agency explained that this process was in line with international best practice as contained in the Consumer Price Index Inter-national Monetary Fund (IMF) Manual, specifically in Section 9.125 and the ECOWAS Harmonised CPI Manual, which address index reference period maximisation, following a rebasing exercise.
On a month-on-month basis, the headline inflation rate in December 2025 was 0.54 per cent, lower than the 1.22 per cent recorded in November 2025.
The NBS also revealed that on a year-on-year basis, the urban inflation rate for last month stood at 14.85 per cent versus 37.29 per cent in December 2024, while on a month-on-month basis, it jumped to 0.99 per cent from 0.95 per cent in the preceding month.
As for the rural inflation rate in December 2025, it stood at 14.56 per cent on a year-on-year basis from 32.47 per cent in December 2024, and on a month-on-month basis, it declined to -0.55 per cent from 1.88 per cent in November 2025.
It was also disclosed that food inflation rate in December 2025 was 10.84 per cent on a year-on-year basis from 39.84 per cent in December 2024, while on a month-on-month basis, it declined to -0.36 per cent from 1.13 per cent in November 2025 (1.13%).
This was attributed to the rate of decrease in the average prices of tomatoes, garri, eggs, potatoes, carrots, millet, vegetables, plantain, beans, wheat grain, grounded pepper, fresh onions and others.
By Modupe Gbadeyanka
Companies operating in Lagos State have been reminded of their obligations to file their annual tax returns for the 2025 financial year on or before January 31, 2026.
This reminder was given by the Lagos State Internal Revenue Service (LIRS) in a statement made available to Business Post on Thursday.
In the notice signed by the chairman of the tax agency, Mr Ayodele Subair, it was stressed that filing the tax returns is an obligation as stipulated in the Nigeria Tax Administration Act (NTAA) 2025.
He explained that employers are required to file detailed returns on emoluments and compensation paid to their employees, as well as payments made to their service providers, vendors and consultants, and to ensure that all applicable taxes due for the year 2025 are fully remitted.
Mr Subair emphasised that filing of annual returns is a mandatory legal obligation, and warned that failure to comply will result in statutory sanctions, including administrative penalties, as prescribed under the new tax law.
According to Section 14 of the NTAA, employers are required to file detailed annual returns of all emoluments paid to employees, including taxes deducted and remitted to relevant tax authorities. Such returns must be filed and submitted not later than January 31 each year.
“Employers must prioritise the timely filing of their annual income tax returns. Compliance should be part of our everyday business practice.
“Early and accurate filing not only ensures adherence to the law as required by the Nigerian Constitution, but also supports effective revenue tracking, which is important to Lagos State’s fiscal planning and sustainability,” he noted.
The LIRS chief disclosed that electronic filing via the organisation’s eTax platform remains the only approved and acceptable mode of filing, as manual submissions have been completely phased out. This measure, he said, is aimed at simplifying and standardising tax administration processes in the state.
Employers are therefore required to submit their annual tax returns exclusively through the LIRS eTax portal: https://etax.lirs.net.
Dr Subair described the channel as secure, user-friendly, accessible 24/7, and designed to provide employers with a convenient and efficient means of fulfilling their tax obligations, advising firms to ensure that the tax identification number (Tax ID) of all employees is correctly captured in their filings, noting that employees without a Tax ID must generate one promptly to avoid disruptions during the filing process.
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