| Year | Name | Organisation | Rationale |
| 1978 | G.R.W. Meadly | Department of Agriculture | Established small seeds scheme, subterranean clover seed certification scheme, and involvement in setting up the Agricultural Protection Board and Noxious Weed Act He published the first Weeds of Western Australia publication in 1965 |
| 1979 | Basil Taylor | Department of Agriculture | Services to weed control in agriculture, particularly to establishing aerial and top-dressing industry in the state |
| 1986 | Geoff Pearce | Department of Agriculture | Founding member |
| 1986 | J. Grieg | Department of Agriculture | Founding member |
| 1990 | Des Gilbey | Department of Agriculture | CAWS Medalist |
| 1993 | Alf Humphries | Department of Agriculture | Founding member |
| 1997 | Prof. Marcus Blacklow | University of Western Australia | CAWS Medalist |
| 2002 | John Moore | Department of Agriculture | CAWS Medalist |
| 2005 | John Pierce | Department of Agriculture | CAWS Medalist |
| 2006 | Dr Chris Preston | University of Adelaide | CAWS Medalist |
| 2014 | Rod Randall | Department of Agriculture | CAWS Medalist |
| 2016 | Dr John Scott | CSIRO | CAWS Medalist |
The Weeds Society of Western Australia Inc