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 Aduragbemi Omiyale
The ban on the export of raw shea nuts from Nigeria has been extended by one year by President Bola Tinubu.
A statement from the Special Adviser to the President on Information and Strategy, Mr Bayo Onanuga, on Wednesday disclosed that the ban is now till February 25, 2027.
It was emphasised that this decision underscores the administration’s commitment to advancing industrial development, strengthening domestic value addition, and supporting the objectives of the Renewed Hope Agenda.
The ban aims to deepen processing capacity within Nigeria, enhance livelihoods in shea-producing communities, and promote the growth of Nigerian exports anchored on value-added products, the statement noted.
To further these objectives, President Tinubu has authorised the two Ministers of the Federal Ministry of Industry, Trade and Investment, and the Presidential Food Security Coordination Unit (PFSCU), to coordinate the implementation of a unified, evidence-based national framework that aligns industrialisation, trade, and investment priorities across the shea nut value chain.
He also approved the adoption of an export framework established by the Nigerian Commodity Exchange (NCX) and the withdrawal of all waivers allowing the direct export of raw shea nuts.
The President directed that any excess supply of raw shea nuts should be exported exclusively through the NCX framework, in accordance with the approved guidelines.
Additionally, he directed the Federal Ministry of Finance to provide access to a dedicated NESS Support Window to enable the Federal Ministry of Industry, Trade and Investment to pilot a Livelihood Finance Mechanism to strengthen production and processing capacity.
Shea nuts, the oil-rich fruits from the shea tree common in the Savanna belt of Nigeria, are the raw material for shea butter, renowned for its moisturising, anti-inflammatory, and antioxidant properties. The extracted butter is a principal ingredient in cosmetics for skin and hair, as well as in edible cooking oil. The Federal Government encourages processing shea nuts into butter locally, as butter fetches between 10 and 20 times the price of the raw nuts.
The federal government said it remains committed to policies that promote inclusive growth, local manufacturing and position Nigeria as a competitive participant in global agricultural value chains.
By Adedapo Adesanya
The NASD Over-the-Counter (OTC) Securities Exchange expanded for the first session this week by 1.27 per cent on Wednesday, February 25.
This lifted the NASD Unlisted Security Index (NSI) above 4,000 points, with a 50.45-point addition to close at 4,025.25 points compared with the previous day’s 3,974.80 points, as the market capitalisation added N30.19 billion to close at N2.408 trillion versus Tuesday’s N2.378 trillion.
At the trading session, FrieslandCampina Wamco Nigeria Plc grew by N5.00 to trade at N100.00 per share compared with the previous day’s N95.00 per share, Central Securities Clearing System (CSCS) Plc improved by N4.18 to sell at N70.00 per unit versus N65.82 per unit, and First Trust Mortgage Bank Plc increased by 14 Kobo to trade at N1.59 per share compared with the previous day’s N1.45 per share.
However, the share price of Geo-Fluids Plc depreciated by 27 Kobo at midweek to close at N3.27 per unit, in contrast to the N3.30 per unit it was transacted a day earlier.
At the midweek session, the volume of securities went down by 25.3 per cent to 8.7 million units from 11.6 million units, the value of securities decreased by 92.5 per cent to N80.7 million from N1.2 billion, and the number of deals slipped by 33.3 per cent to 32 deals from the preceding session’s 48 deals.
At the close of business, CSCS Plc remained the most traded stock by value on a year-to-date basis with 34.1 million units exchanged for N2.0 billion, trailed by Okitipupa Plc with 6.3 million units traded for N1.1 billion, and Geo-Fluids Plc with 122.0 million units valued at N478.0 million.
Resourcery Plc ended the trading session as the most traded stock by volume on a year-to-date basis with 1.05 billion units valued at N408.7 million, followed by Geo-Fluids Plc with 122.0 million units sold for N478.0 million, and CSCS Plc with 34.1 million units worth N2.0 billion.
By Dipo Olowookere
The bears consolidated their dominance on the Nigerian Exchange (NGX) Limited on Wednesday, inflicting an additional 0.09 per cent cut on the market.
At midweek, the market capitalisation of the domestic stock exchange went down by N73 billion to N124.754 trillion from the preceding day’s N124.827 trillion, and the All-Share Index (ASI) slipped by 114.32 points to 194,370.20 points from 194,484.52 points.
A look at the sectoral performance showed that only the consumer goods index closed in green, gaining 1.19 per cent due to buying pressure.
However, sustained profit-taking weakened the insurance space by 3.79 per cent, the banking index slumped by 2.07 per cent, the energy counter went down by 0.24 per cent, and the industrial goods sector shrank by 0.22 per cent.
Business Post reports that 25 equities ended on the gainers’ chart, and 54 equities finished on the losers’ table, representing a negative market breadth index and weak investor sentiment.
RT Briscoe lost 10.00 per cent to sell for N10.35, ABC Transport crashed by 10.00 per cent to N6.75, SAHCO depreciated by 9.98 per cent to N139.35, Haldane McCall gave up 9.93 per cent to trade at N3.99, and Vitafoam Nigeria decreased by 9.93 per cent to N112.50.
Conversely, Jaiz Bank gained 9.95 per cent to settle at N14.03, Okomu Oil appreciated by 9.93 per cent to N1,765.00, Trans-nationwide Express chalked up 9.77 per cent to close at N2.36, Fortis Global Insurance moved up by 9.72 per cent to 79 Kobo, and Champion Breweries rose by 5.39 per cent to N17.60.
Yesterday, 1.4 billion shares worth N46.2 billion were transacted in 70,222 deals compared with the 1.1 billion shares valued at N53.4 billion traded in 72,218 deals a day earlier, implying a rise in the trading volume by 27.27 per cent, and a decline in the trading value and number of deals by 13.48 per cent and 2.76 per cent, respectively.
Fortis Global Insurance ended the session as the busiest stock after trading 193.7 million units for N152.7 million, Zenith Bank transacted 120.7 million units worth N11.1 billion, Japaul exchanged 114.8 million units valued at N407.0 million, Ellah Lakes sold 98.4 million units worth N999.2 million, and Access Holdings traded 63.1 million units valued at N1.7 billion.
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