This Convention ... replaces for the parties thereto the 1881 International Convention respecting measures to be taken against Phylloxera Vastatrix ... and 1889 Additional Convention .... All but Czechoslovakia of the parties to the 1881 Convention have become arties to this [1951] Convention. It replaces also the 1929 Rome Convention for the Protection of Plants ... for the parties thereto, of which only Algeria and Bulgaria have not accepted the 1951 Convention.