Presidents European Weed Research Council (EWRC 1959-1975)
| E K WOODFORD (UK) | 1959 to 1960 | |
| Bernhard RADEMACHER (DE) | 1960 to 1961 | |
| Robert LONGCHAMP (FR) | 1961 to 1964 | (HM) |
| Torstein VIDME (NO) | 1964 to 1967 | (HM) |
| Jos M T STRYCKERS (BE) | 1967 to 1970 | (HM) |
| J P AMARO (PT) | 1970 to 1973 | |
| John D FRYER (UK) | 1973 to 1975 (also Chairman EWRS Steering Committee) | (HM) |