Kabosu Papeda Hybrid Budwood

Citrus sphaerocarpa.

Slightly larger than Yuzu, the average fruit size of Kabusu citrus has a mean width of 5.3 cm (2.1 inches) and a height of 5.2 cm (2.0 inches), giving an average height-to-width aspect ratio of 0.98 and a more rounded shaped. Kabosu has a mean weight per fruit of 71.2 grams (2.51 ounces). Color break for Kabosu occurs between the first and third week of September. The rind texture is slightly pebbly with a mean thickness of 4.2 mm (.17 inches). The number of seeds per fruit averages 17.2, higher than Sudachi, but lower than Yuzu. The mean juice weight is 20.2 grams (0.71 ounces) and the average juice content is 28.2%, slightly higher than Yuzu, but lower than Sudachi. The juice weight and juice content increased during the sampling dates. The internal flesh color of Kabosu in the green stage ranges from light-yellow to dark-yellow. Kabosu tends to be the least acidic of the three acid types with an average of 3.2% citric acid.

Kabosu trees have a dense, spreading habit of moderate vigor. Trees that are 20 years old on Carrizo and C-35 citrange rootstocks are approximately 10 feet tall with no indications of rootstock-scion incompatibility. Thorns up to 5 mm in length are present in each leaf axil, but not present on every branch. Leaves are elliptical in shape, with a medium-winged petiole.

Rootstocks of accession:  Carrizo citrange.

Season of ripeness at Riverside, California:  September to October.

Prepared by the Givaudan Citrus Variety Collection at The University of California Riverside.