Bud grafting is the main implant material of rubber tree (Hevea brasiliensis). Rootstock is a important component part of rubber budding tree and has influenced scion yield. At present, the ethrel stimulated tapping system is a primary tapping system. So rootstocks maybe influence characters of the ethrel stimulated tapping. Sensitivity to ethrel injury in different growth periods of rubber seedling is studied. It’s a basic to further research relation between rootstock and ethrel stimulated tapp...