Pesticide Residues Threaten Continental Trade in Agricultural Goods

By Danilo Desiderio

Alarming levels of banned pesticide residues – some linked to developmental and reproductive harm – have been found in potatoes grown in Nyandarua County, Kenya. Researchers from Egerton University identified toxic substances such as chlorpyrifos and fenitrothion in samples collected from local farms.

These findings point to widespread misuse of synthetic pesticides by nearly all surveyed farmers, raising serious concerns about food safety and public health.

The study revealed that even after common cooking methods like baking and roasting, harmful chemical residues remained above internationally accepted safety limits. While frying was shown to significantly reduce residue levels, and boiling offered moderate mitigation for some pesticides, no method completely eliminated the risk.

This underscores an immediate threat to consumers who regularly consume these staple crops.

The research, set to be published in the Journal of Food Protection on June 23, will also appear in preview on ScienceDirect. The authors call for urgent interventions, including targeted farmer education on responsible pesticide use and consumer awareness campaigns recommending frying or boiling as ways to minimize exposure to harmful residues.

A Systemic Challenge Across Africa

Beyond health implications, this situation reflects a broader systemic issue across many African nations. Weak food safety controls and inconsistent agricultural practices threaten the growth of intra-African trade – a key objective of the African Continental Free Trade Area (AfCFTA).

As the continent seeks to expand regional markets by removing tariff and non-tariff barriers, unchecked pesticide contamination risks undermining trust in locally produced goods.

Currently, many African countries struggle with enforcing pesticide regulations due to inadequate infrastructure, limited financial resources, and insufficient technical capacity. This lack of oversight not only endangers public health but also erodes consumer confidence in regionally sourced foods.

As a result, African consumers may increasingly favor imports from third countries perceived to have stricter food safety standards.

This trend could stifle the development of intra-African agricultural trade and widen existing trade imbalances with global partners. Moreover, growing concerns over food safety may prompt individual African states to adopt stricter – and potentially conflicting – Sanitary and Phytosanitary (SPS) measures.

Such divergence could further restrict the flow of agricultural products between African countries, counteracting the very purpose of the AfCFTA.

The Egerton University report serves as a wake-up call for coordinated, continent-wide action. Harmonizing food safety standards, particularly those governing pesticide use and maximum residue levels (MRLs), is critical to safeguarding both consumer health and the integrity of regional trade.

While the African Organisation for Standardisation (ARSO) plays a pivotal role in developing unified standards, including MRLs, its mandate stops at formulation – not enforcement. The success of ARSO’s efforts hinges on the establishment of robust monitoring systems and national-level farmer education programs across all AfCFTA member states.

Ultimately, if current initiatives to standardize food safety protocols fail to address these foundational challenges, the AfCFTA’s potential to drive agricultural growth and deepen economic integration will remain unrealized. Without strong, consistent regulatory frameworks, Africa may continue to rely heavily on food imports from countries viewed as having safer production systems – undermining the very vision of self-sufficiency and regional prosperity the agreement seeks to achieve.

Danilo Desiderio serves as the CEO of Desiderio Consultants Ltd in Nairobi, Kenya, specializing in African customs, trade, and transport policies. He is a customs and trade expert at the World Bank and a senior associate to the Horn Economic and Social Policy Institute (HESPI).