7 CFR § 201.58c
Detection of captan, mercury, or thiram on seed
July 6, 2020
The bioassay method may be used according to the procedure given in Association of Official Seed Analysts, Handbook No. 26, “Microbiological Assay of Fungicide-treated Seeds”, May 1964.
[38 FR 12733, May 15, 1973]