A cowpea farmer in northern Nigeria brings in a good harvest and faces an old problem. Stored beans attract weevils, and the cheapest protection is a pesticide sold in a small bottle. Nobody checks what that bottle contains before the beans go to an aggregator, are blended with other lots and travel to a port.
That is how Nigerian beans came to be tested at between 0.03 and 4.6 milligrams of dichlorvos per kilogram, against a European Union maximum residue limit of 0.01. The EU suspended imports of Nigerian beans in 2015. It extended the suspension to June 2019, and then by three years to 30 June 2022 (BusinessDay, 10 February 2021).
The episode is usually told as a story about pesticides. It is more useful as a story about where compliance is decided.
Where does a pesticide residue come from?
The residue is created in storage, on thousands of small farms, by a product that farmers use to keep beans free of insects. BusinessDay reported that the agrochemical in common use contains DDVP, another name for dichlorvos. A test at the border measures the result and cannot change it.
The scale makes inspection at ports impractical. Nigeria produced 3.6 million tonnes of cowpea in 2019, according to the FAO, and accounts for about 61% of Africa's production and 58% of the world's, according to IITA figures cited in the same report. A crop that size, grown and stored by smallholders, cannot be controlled one container at a time.
Why does one bad lot damage an entire origin?
Buyers cannot inspect every consignment, so they judge by origin. When tests keep finding residues above the limit, the regulator's sensible response is to restrict the origin, and that is what the European Commission did.
When it extended the suspension in 2021, the Commission said, as BusinessDay reported, that Nigeria had not implemented the food safety action plan it submitted in 2018 and had not allocated a budget for it. It also said Nigeria's work on pest management and residue limits did not show that EU requirements were met.
We read this as a collective penalty. An exporter with clean lots and tested storage faced the same restriction as one with contaminated stock, because the system could not tell them apart.
What did the regulator say about enforcement?
In a statement carried by Food Business Africa, the Director-General of NAFDAC, Professor Moji Adeyeye, said that most of the products rejected by the EU had been smuggled out of the country and were not certified by NAFDAC or the Nigeria Agricultural Quarantine Service. NAFDAC agreed with the EU that affected products would undergo 100% pre-export testing and receive a health certificate if they met the limits.
Two separate problems sit in that statement. Some goods leave through channels where no control applies. Those that do pass through control are tested after the problem has already been created. Testing every lot is expensive, and checking how a lot was stored is much cheaper.
What would lot-level control look like?
It would start at the point of aggregation. The aggregator buys from identified farmers and opens a record for each lot: where it came from, how it was stored, what treatment was used and when. A sample from each lot is tested before blending. A lot that fails is held back, and one that passes carries its record and its certificate through to the exporter.
The cost falls on the aggregator and the exporter, but the benefit is shared by every compliant seller in the origin, because a record that can be checked is the only thing that separates them from the worst lot in the market.
This piece covers the period from 2015 to 2022. It does not assess the position of the suspension after 30 June 2022.
What the episode shows
The ban lasted because the controls that could have ended it needed budget and sustained execution, and the Commission found neither in place. A plan on paper did not count. Exporters in any commodity face the same test: whether the checks that matter are done where the risk is created, and whether the record of them survives to the border.
Executive Summary
A Ban That Outlived Its Action Plan: What Nigeria's Beans Taught Exporters About Compliance
The European Union suspended imports of Nigerian dried beans in 2015 and extended the suspension to mid-2022. The episode shows that compliance is settled in storage and aggregation, long before a lot reaches the border.
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