Maximum residue limits are the part of a technical dossier that buyers read most carefully and that suppliers describe most loosely. It is worth being precise about what the framework asks and where compliance is genuinely determined.
What the regulation actually asks
Regulation (EC) No 396/2005 harmonises maximum residue levels for pesticides in and on food across the European Union. An MRL is not a safety threshold in the way it is often described in commercial conversation — it is the highest residue legally tolerated when a plant-protection product has been used correctly. It is, in other words, a check on agricultural practice, applied at the border.
The practical implication for a grower is uncomfortable and clarifying: the limit is where enforcement happens. It is not where the growing programme should aim.
Compliance is decided by the pre-harvest interval
Almost every residue failure is a calendar failure. Each authorised product carries a pre-harvest interval — the minimum time that must pass between the last application and picking — and that interval is what brings residues down to where the analysis will find them acceptable.
Which means compliance is decided weeks earlier than most people assume, by whoever holds the spray record and the picking plan and reconciles the two. A laboratory result is confirmation of a decision already taken. It is not the decision.
If the residue analysis is the first place anyone looks at the spray record, the analysis is being asked to do a job it cannot do.
Sampling that means something
A result is only as good as the sample behind it. Three things carry the weight:
- Accreditation — the analysis runs at an independent laboratory accredited to
ISO/IEC 17025for the scope being tested, not merely at a laboratory that says it follows the method. - Representativeness — the sample is drawn across the lot rather than from whatever crate is nearest the door.
- Timing — sampling happens before harvest is authorised, so an unfavourable result changes the harvest date instead of stranding a packed lot.
The EU list is not the world's list
A programme that satisfies EU limits has not automatically satisfied every destination. Active substance approvals, tolerances and import tolerances differ between the EU, the United Kingdom, Gulf markets and elsewhere, and they change on their own timetables. The list a lot is tested against therefore belongs in the contract, alongside the incoterm and the packing specification — early, in writing, and per destination.
What a buyer should be asking for
- Which residue list the lot was tested against, named explicitly
- The accreditation scope of the laboratory that ran it
- When the sample was drawn relative to the harvest date
- How the spray record ties back to the block and the lot reference
Our own quality controls, from soil and water testing through to reefer loading, are set out in quality assurance and traceability.