Hexythiazox is an approved active substance in GB.
HSE has identified a chronic intake concern for hexythiazox, with citrus fruits, apples and pears being the main contributors to chronic exposures.
As harmful effects for human health cannot be excluded, it is proposed to lower the specific MRL for hexythiazox/citrus fruit from 1 mg/kg to the Codex MRL (CXL) of 0.5 mg/kg; and to lower the MRLs for hexythiazox/apples and pears from 1 mg/kg to the CXL of 0.4 mg/kg.
In addition, HSE proposed to adopt CXLs for strawberries (6 mg/kg), cane fruits (4 mg/kg), teas (15 mg/kg) and bird’s eggs (0.05 mg/kg).
View the draft reasoned opinion on HSE's website.
The proposed date of adoption and publication of the new MRL is 25 July 2026.
The proposed date of entry into force of the new MRL will be 6 months after the date of adoption and publication.
To meet the UK’s international trade obligations, the measures have been notified to the World Trade Organization.
On completion of this process, an update on the final MRL agreed, along with the date of entry into force, will be communicated via HSE’s ebulletin service.
Visit HSE’s website for more information and guidance on the MRL processes for GB.
Stakeholders should note that maximum residue levels are in scope of the Sanitary and Phytosanitary (SPS) agreement currently being negotiated between the UK and the EU. Once negotiations on the SPS Agreement have concluded, HSE will communicate further on any implications the agreement has for the sector.
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