Global disharmony exists in current regulatory requirements regarding whether multiple seasons of field residue trials are necessary. Historical residue data were used to evaluate whether the year in which trials were conducted impacts results.  This analysis revealed that residue behavior is highly variable in nature, regardless of the season, that variation of residue data compiled from multiple years is not statistically greater than data resulting from trials conducted within any one year, and that variation across years does not result in large systematic differences in residue values or resulting Maximum Residue Limits compared to trials conducted in any single year. Field trials conducted in a single season at a variety of locations across geographical regions will capture variability due to different environmental conditions and agricultural practices and provide a robust estimate of the spread of residues expected due to labeled use of a pesticide.

Comprehensive analysis of the value of single versus multiple year (season) crop residue data for establishment of maximum residue levels (MRLs)

ACS Fall 2021

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