干旱区生态环境知识资源中心

’Fuji’ apple (Malus X domestica Borkh) has gained popularity in the past decades, but poor color of this apple mandates introduction of new strains. To pursue this objective, long-term effects of five ’Fuji’ apple strains, consisting of ’Autumn Rose’, ’Desert Rose’, ’Myra’, ’september Wonder’, and ’Top Export’ on RN 29 rootstock on fruit yield (in 7 years) and harvest time quality attributes (in 6 years) under climate conditions of southwest Idaho were studied during 2004-10. Fruit of ’september Wonder Fuji’ trees were larger than those of other strains in 5 of 6 years. The type or pattern of peel color among the "low-coloring" and "high-coloring" strains varied widely. Fruits of ’Autumn Rose Fuji’, ’Myra Fuji’, and ’Top Export Fuji’ always had less but ’september Wonder Fuji’ and ’Desert Rose Fuji’ had more red color. Fruit of ’september Wonder Fuji’ had lower firmness but higher starch degradation pattern (SDP) than those of other strains every year as a result of the earlier maturity of this strain. Fruit of ’Top Export Fuji’ had the lowest SDP among all strains. Fruit of ’Autumn Rose Fuji’ tended to have lower soluble solids concentration in 3 of 6 years of this study. Considering all yield and quality attributes at harvest, ’september Wonder’ was a great choice for an early-maturing and ’Desert Rose’ was suitable for a late-maturing ’Fuji’ strain. ’Myra Fuji’ was particularly desirable for its attractive pink color that resembles bagged ’Fuji’ without the expensive cost of labor associated with bagging.