OECD | Revised Draft Test Guideline on Chemicals - Crop Field Trial (TG509) | Deadline for Comments 19 June 2020

Draft guidance purpose and scope: 

Crop field trials (also referred to as supervised field trials) are conducted to 3 determine the magnitude of the pesticide residue in or on raw agricultural commodities, 4 including feed items, and should be designed to reflect pesticide use patterns that lead to 5 the highest possible residues. Objectives of crop field trials are 6

1) to quantify the expected range of residue(s) in crop commodities following 7 treatment according to the proposed or established good agricultural practice (GAP); 8

2) to determine, when appropriate, the rate of decline of the residue(s) of plant 9 protection product(s) on commodities of interest; 10

3) to determine residue values such as the Supervised Trial Median Residue (STMR) 11 and Highest Residue (HR) for conducting dietary risk assessment and calculation of the 12 dietary burden of livestock; and 13

4) to derive maximum residue limits (MRLs). 14 Crop field trials may also be useful for selecting residue definitions by providing 15 information on the relative and absolute amounts of parent pesticide and metabolites.

Link to the Revised Draft Test Guideline on Crop Field Trial (TG509)