Prepared by the Certification Section of the Potato Association of America


Agency 12 2 3 4 5 6 7 8
Alaska G12 G2 G3 G4 G5 G6 G7 G8
California N G1 G2 G3 F C -- --
Colorado G1 G2 G3 G4 G5 G6 -- --
Idaho N G1 G2 G3 G4 G5 G6 --
Maine (Maine Seed Potato Board Farm) N1 G1 G2 G3 G4
Michigan FY1 FY2 FY3 FY4 FY5 FY6 -- --
Minnesota N G1 G2 G3 G4 G5 -- --
Montana N G1 G2 G3 G4 -- -- --
Nebraska N G1 G2 G3 G4 G5 -- --
New York4 (Uihlein Farm) G1 G2 G3 G4 G5 G6
N. Dakota N G1 G2 G3 G4 G5 -- --
Oregon N G1 G2 G3 G4 G5 -- --
Utah N(G1) G2 G3 G4 G5 G6 -- --
Washington N G1 G2 G3 G4 -- -- --
Wisconsin E1 E2 G1 G2 G3 G4 C --
Canada PE (G1) E1 (G2) E2 (G3) E3 (G4) E4 (G5) F (G6) C (G7) --

1 The purpose of this table is to express equivalency of terms used by various certification agencies for seed potatoes harvested from a series of successive field planting. For specific criteria relating to disease tolerances and other requirements, the reader is referred to the certification regulations of the agency in question

2 The first field planting utilizes laboratory-tested stocks which may be tissue-cultured plantlets, greenhouse-produces minitubers, stem cuttings, or line selections. Contact agencies for details as to types of stock planted in their programs.

3 Terms used by agency for seed potatoes for a particular year in the field: C=certified, E=elite, F=foundation, G=generation, N=nuclear, PE=pre-elite.