The CORESTA Agrochemical Analysis Sub-Group is part of the Product Technology Study Group. The Sub-Group's objectives are:

1. To perform regular proficiency testing of Multi-Residue Methods for the analysis of agrochemical residues on tobacco.
2. Undertake joint experiments to resolve unanswered questions arising from proficiency tests.
3. Produce and maintain a series of Technical Notes (on different agrochemical residue classes and selected individual compounds) to supplement the CORESTA Guideline No. 5 (Technical Guideline for Pesticide Residues Analysis on Tobacco and Tobacco Products) and aid in method development and improvement.

This paper will report on the Sub-Group activities in 2010 focusing on the outcome of the annual proficiency test, conducted in collaboration with FAPAS (part of the Food and Environment Research Agency, York, UK), the results of the Joint Experiment on Cyfluthrin and the degradation study on eight agrochemicals. It will also present the various Technical Notes produced by the Sub-Group.