The Agricultural Service Diploma is awarded by the Ontario Association of Agricultural Societies on the recommendation of the Chesley Agricultural Society for meritorious service to agriculture.
John Rhody, 2013 President, presents the Agricultural Service Diploma to Valerie Wasserfall:

Agricultural Service Diplomas have been awarded to the following:
- Mrs. John Oswald
- Bert Monk
- Dunc McTavish
- Mrs. George Hope
- Bill Arkell
- Alex McTavish
- Aldythe McKinnon
- Guy Kirkwood
- Lois (Black) Schopf
- Elmer & Marguerite Golem
- Jim Cullen
- Dorreta Phillips
- Don McAllister
- Clarence Lange
- John & Jessie Thomson
- Wilfred & Dorothy Reid
- Andy Thomson
- Verna Gateman
- James & Marian Jacklin
- Fred & Dorothy Friar
- Lorne & Hazel Sweiger
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- Earl Reaburn
- George & Essie Mannerow
- George & Verna Maxwell
- Gordon Scott
- Edythe Manery
- Jean Mannerow
- Mary Dudgeon
- Vada Calhoun
- Donelda McClure
- Lloyd Mannerow
- Kelly & Florence Long
- Sandy & Brenda McAllister
- John Rhody
- Marjorie Mannerow
- Marion McAllister
- Sherry Manery
- Arthur Middleton
- Harold Leudke
- Herb & Elizabeth McGilveary
- Don & Freda Ahrens
- Kevin Leudke
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