Color Evaluations off Delicious Strains

Abstract

Fruit samples from commercial apple orchards were collected at 145 to 150 days after full bloom in 1985 through 1987. Color measurements were performed on each of 10 fruit at 8 points on the side circumference of each apple using a HunterLab D25 Optical Sensor. Results were recorded as lightness (L), and hue angle (Ø). Strains were compared to three standards: ‘Redchief,’ ‘Sturdeespur’ and ‘Starkrimson.’ Significant correlations were found between Ø and L in all orchards as well as between L values and consumer determinations of overall acceptability and perceived flavor. At all sites, ‘Starkrimson’ and ‘Redspur’ consistently had higher L values than any of the other strains indicating lighter colored fruit at harvest. Other strains that appeared to be lighter colored during the harvest period chosen include ‘Wellspur,’ and ‘Redprince.’ Within any one year there were significant differences between strains within an orchard. There was more variability within strains than among strains within orchards and years.