Effects of peach or hybrid rootstocks on growth and croppingof two cultivars of peach trees (Emeraude and Zephyr). Abstract - Introduction. Rootstock is an important consideration for a productive peachorchard, especially in a replanting situation. A peach and two hybrid rootstocks, graftedwith an early and a late-season peach cultivar, were planted and their growth compared. Theexperimental area had been used since 1970, for two generations of successive peach crops.Materials and methods. Emeraude (early-season) and Zephyr (late-season) were graftedonto GF 305 (peach rootstock), GF 677 and Cadaman $^{\circledR}$ Avimag (hybrid rootstocks), andwere planted in a split-plot experimental design. Fruit yield and vegetative growth wereassessed annually. Results. Vegetative growth was greater with the hybrid rootstocksthan with the peach rootstock. Fruit production was higher with Cadaman than with GF 677,which was higher than with GF 305. Yield differences associated with rootstocks were greaterwith Emeraude in comparison with Zephyr, as suggested by the rootstock × cultivarinteraction. Discussion. Compared to the previous peach plantation on the same land,the differences observed in this current experiment, between the peach rootstock GF 305 andthe hybrid rootstock GF 677, widened, suggesting a replanting decline with the peachrootstock. In the given conditions, the hybrid rootstock Cadaman appeared to be better suitedthan GF 677 to improving peach production.