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World of CitrusWorld of CitrusUFR-18
FFSP
FFSP fact sheet reports a four-year-old CRAFT OLL-8/Orange 14 tree with quick growth and medium eventual size under heavy Diaprepes/Phytophthora pressure. This is a source-specific observation and graft pairing; it does not establish immunity or universal resistance.
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United States Patent and Trademark Office (Google Patents)
https://patents.google.com/patent/US20260130303P1/en (opens in a new tab)
Parentage extraction only: indexed application text identifies Orange 14 as an allotetraploid tetrazyg produced by a conventional cross of two protoplast-fusion somatic hybrids—the seed parent was a Nova mandarin hybrid + Hirado Buntan pummelo zygotic seedling, and the pollen parent was a Cleopatra mandarin + Argentine trifoliate orange hybrid. No legal-status conclusion is recorded.
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UF/IFAS Statewide Citrus Research and Extension
https://citrusresearch.ifas.ufl.edu/cultivars/rootstocks/ufr-18/ (opens in a new tab)
UF/IFAS identifies UFR-18 as Orange 14 and describes it as an allotetraploid zygotic hybrid (tetrazyg). Its Origin section gives the seed parent as Nova mandarin hybrid + Hirado Buntan pummelo (zygotic seedling), and the pollen parent as Cleopatra mandarin + Argentine trifoliate orange.
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Paul Rusnak · Growing Produce · April 16, 2025
Lines 107–117 identify Orange 14 as a rootstock selection reported to have performed well under HLB pressure, including an area with heavy Diaprepes/Phytophthora pressure; lines 113–116 describe the UF/IFAS collaboration and state none of the six varieties is HLB-resistant.
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Peter Chaires · Citrus Industry · March 16, 2026
Lines 35–46 identify Orange 14 as a rootstock that performs well under HLB pressure and place it in the Florida-licensed UF variety group; lines 57–59 describe Florida-focused licensing. This is a nursery availability/licensing overview, not a measured trial report.
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Daniel Cooper · Citrus Industry · April 18, 2025
https://citrusindustry.net/2025/04/18/hlb-tolerant-varieties-available/ (opens in a new tab)
Lines 34–42 identify Orange 14 rootstock as performing well under HLB pressure, including at an area with heavy Diaprepes/Phytophthora pressure; lines 42 and 47–48 state none is HLB-resistant and that broader testing/evaluation remains needed. Source: FFSP.
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Brad Buck · UF/IFAS · April 16, 2025 (updated March 6, 2026)
Lines 105–108 frame the selections as promising and worthy of commercial-grove trials, with further supporting data desired; lines 110–122 describe Orange 14 rootstock as performing well under HLB pressure, including an area with heavy Diaprepes/Phytophthora pressure, and state no variety is HLB-resistant.
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Daniel Cooper · Citrus Industry · October 2, 2026
https://citrusindustry.net/2026/10/02/grossers-promising-citrus-picks/ (opens in a new tab)
Lines 33–46 report that UFR-18 showed good tolerance to Diaprepes, screened well for sting nematode tolerance, and showed HLB tolerance; the article quotes a field-day observation of 10- to 11-year-old trees in Jason Griffin’s grove. This is a reported observation without trial design or general resistance claim; UF/IFAS identifies UFR-18 as Orange 14.
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