03242naa a2200229 a 450000100080000000500110000800800410001910000180006024501120007826000090019052024790019965000170267865000200269565000260271565000260274170000180276770000180278570000180280370000230282170000140284477301540285811360652025-10-23       2025    bl uuuu     u00u1 u    #d1 aDOCEMA, M. L.  aCG?? rootstocks support high apple yields despite the drop in the 2024/2025 harvest.h[electronic resource]  c2025  aApple production in Santa Catarina is strategic for the national fruit-growing sector, with emphasis on the Southern Plateau, which offer edaphoclimatic conditions favorable for the cultivation of ???Fuji??? apple trees. To address challenges related to orchard management, plant vigor, and orchard density, new rootstocks have been adopted, especially those from the Geneva?? (CG) series, developed by Cornell University. The objective of this study was to evaluate the effects of different rootstocks from the CG series on productive parameters of apple trees. The experiment was carried out at the S??o Joaquim Experimental Station, part of the Agricultural Research and Rural Extension Company of Santa Catarina (Epagri), in a Fuji Suprema???apple orchard established in 2018. The trees were trained in a two-dimensional central leader system, with a spacing of 3.5 m x 1.0 m (2,858 trees/ha). The experimental design was a randomized block, with five treatments (rootstocks G.41, G.222, G.11, G.890, and G.969), four replications, and experimental units composed of ten trees each. In the 2024/2025 season, the following variables were measured: production per plant (kg), estimated yield (t/ha), number of fruits per tree, average fruit weight (g), trunk cross-sectional area (TCSA, expressed in cm??), and yield efficiency (kg/cm??), the latter calculated as the ratio between fruit mass and TCSA. Data were subjected to analysis of variance (ANOVA), and means were compared using Tukey???s test (p&lt0.05). The G.41 (83.67 t/ha) and G.222 (64.83 t/ha) root stocks resulted in the highest yields among the apple trees analyzed. However, they differed significantly only from G.969, whose yield was 54.4% lower (38.21 t/ha). A similar pattern was observed for the number of fruits per tree, with trees grafed on G.41 (182.8), G.222 (171.75), and G.890 (166.9) showing significantly higher values than the other treatments. No significant differences in average fruit weight were found among treatments. In terms of vigor, the G.969 rootstock showed the lowest TCSA value (13.55 cm??), which was significantly smaller. The highest yield efficiencies were observed in trees grafed on G.41 (0.98 kg/cm??) and G.969 (0.98 kg/cm??), significantly outperforming G.222 (0.60 kg/cm??) and G.890 (0.65 kg/cm??). Thus, the rootstocks G.41 and G.222 appear to be promising for the ???Fuji Suprema??? production under the edaphoclimatic conditions of S??o Joaquim, Santa Catarina.  aFuji Suprema  aGeneva?? series  aMalus domestica Borkh  aproductive parameters1 aMARTIN, M. S.1 aDANIEL, E. S.1 aTHUROW, L. B.1 aSILVA FILHO, J. G.1 aLERIN, S.  tIn: CONGRESSO BRASILEIRO DE FRUTICULTURA, 29., 2025, Campinas, SP. Anais [...]. Campinas, SP: Sociedade Brasileira de Fruticultura, 2025. p. 688-688.