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World of CitrusWorld of CitrusRedblush Grapefruit
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc2850 (opens in a new tab)
Accessed
J.V. da Graça, E.S. Louzada, and J.W. Sauls · Proceedings of the International Society of Citriculture · 2004
The paper reports Webb Redblush as a Thompson Pink bud sport found in 1931, and says “Red Marsh” was sometimes used for both Ruby Red and Redblush because the selections were considered indistinguishable (p. 369). It separately reports severe injury from some South African tristeza stem-pitting isolates for Redblush material (p. 371); this is isolate/region-specific, not a universal response.
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GDNC Nursery
https://www.gdncnursery.com/redblush-grapefruit (opens in a new tab)
Nursery description and care guidance for Redblush: small-to-medium tree listed at 20 × 15 ft; pink-to-red, low- or seedless fruit with juicy flesh and thin rind; Coachella Valley late-winter to early-summer ripening. Seller describes sweet, tangy flavor and gives a short-period 30°F tolerance figure without a test protocol; retain as nursery guidance, not a measured survival threshold. Its other-names list includes Ruby Red, which does not establish identity with the separate catalog selection.
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USDA APHIS IDtools · October 2011
https://idtools.org/citrus_id/index.cfm?packageID=1179&entityID=8768 (opens in a new tab)
Citrus ID Edition 2 cultivar page. Its morphology entry describes fruit as broad as long or longer, a yellow-to-orange rind, orange-to-red or purplish flesh, no navel, and grapefruit-like taste. The page reproduces Hodgson (1967) on Redblush as a Thompson limb sport observed in 1931 and introduced in 1934, and on its practical similarity to Ruby; this is secondary historical text and does not establish identity of the separate catalog selections. The synonym list is broad and is not being used to add aliases.
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Seville Oranges · Seville Oranges · 2021-04-28
https://sevilleoranges.com/red-blush-grapefruit-juicy-sweet-and-fragrant/ (opens in a new tab)
The article describes Red Blush grapefruit as juicy, sweet and fragrant with red flesh, and calls it seedless; these are general promotional statements, not a documented fruit sample. Its historical and cultivar-description passages reproduce Hodgson (1967) material also available in the local UCR capture and IDtools page, so they are derivative rather than independent corroboration. The article’s Redblush/Ruby wording does not establish identity between the separately catalogued selections.
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Graham H. Barry et al. · The Genus Citrus (ScienceDirect Topics excerpt) · 2020
The chapter reports Webb’s Redblush as a similar Thompson mutation found in Texas in 1931 and recounts that Ruby Red and Redblush were later considered identical because they were indistinguishable. It presents reported historical accounts, not proof that the catalog’s separate variety identities are the same accession.
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Heinz K. Wutscher; E. O. Olson; A. V. Shull; Ascension Peynado · Journal of the American Society for Horticultural Science 95(3):259–261 · May 1970
https://doi.org/10.21273/JASHS.95.3.259 (opens in a new tab)
The paper studies four-year-old nucellar ‘CES No. 3 Redblush’ grapefruit scions grafted on 16 rootstocks in a calcareous-soil trial; the cultivar name matches Redblush Grapefruit, but the authors give no UCR CRC accession or clone identity. Planted in 1964 at a well-drained Hidalgo fine sandy loam site (pH 8.4; 6–9% CaCO3 in the upper foot); chlorosis scored in 1966 and 1969. Survival counts use seven trees per rootstock; other measurements use four replications. Rootstock-combination outcomes must not be treated as intrinsic Redblush scion traits or fruit-yield/quality results.
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Heinz K. Wutscher; A. V. Shull · Journal of the American Society for Horticultural Science 97(6):778–781; American Society for Horticultural Science · November 1, 1972
https://journals.ashs.org/downloadpdf/view/journals/jashs/97/6/article-p778.pdf (opens in a new tab)
The study reports a rootstock trial with 14-year-old nucellar Redblush grapefruit and includes fruit-quality samples from trees on Savage rootstock. Table 2’s caption states two-year means based on samples from eight trees per rootstock. The searchable extraction interleaves column headings, so its Savage row values are not assigned to individual measurements here. These are Redblush scion observations, not Savage fruit measurements.
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