Citrus paradisi Macfadyen
Photos by Toni Siebert and David Karp, CVC, 5/22/2008. Photo rights. C-35 left, Carrizo right, 25 year old trees.
Source: Received as seed from Florida, via W. Reuther, UCR, 1962.
Parentage/origins: Parents unknown. Duncan grapefruit is believed to be the oldest grapefruit variety grown in the United States. Although not named until 1892, it was growing as early as 1830 near Safety Harbor, Florida.
Rootstocks of accession: Carrizo citrange, C-35 citrange
Season of ripeness at Riverside: January to May
Notes and observations:
OJB: The tree is large, spreading, and grows vigorously. The fruit is almost round and has a smooth, light yellow rind. The flesh is very pale yellow, juicy, and seedy. The flavor is considered by many to be superior to similar seedless grapefruit varieties. Duncan is considered to be somewhat early in maturity. The fruit holds well on the tree. As with other grapefruit varieties, it should be grown in locations that can satisfy its high heat requirement.
5/29/2009, DK & TS: Flavor rich, fruity, intense, less bitter; seedy.
Description from The Citrus Industry Vol. 1 (1967):
"Fruit large, oblate to globose or broadly obovate; basal furrows short and radiating; areolar ring faint; seedy. Color pale to light yellow. Rind medium-thick and surface smooth and even. Flesh color buff to chamois-colored; tender, very juicy; flavor pronounced and excellent. Medium-early in maturity.
Availability: Clean budwood source available in California through the Citrus Clonal Protection Program. Source trees are not registered yet.
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