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World of CitrusWorld of CitrusUS-1281 Citrandarin
Kim D. Bowman and Greg McCollum · HortScience 50(11):1731–1734 · November 2015
https://doi.org/10.21273/HORTSCI.50.11.1731 (opens in a new tab)
Hamlin sweet-orange yield on rootstocks in two Florida trials; performance depended on site, disease and management. Values describe grafted scion trees, not rootstock fruit traits.
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Citrus Rootstocks
https://citrusrootstocks.org/rootstock-cultivars/ (opens in a new tab)
The index lists US-1281 parentage as Citrus reticulata ‘Cleopatra’ × Poncirus trifoliata ‘Gotha Road’ and its USDA release date as 2014. The table does not report selection, field performance, release contributors, or other historical events.
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USDA Agricultural Research Service
https://citrusrootstocks.org/wp-content/uploads/2020/03/US-1281.pdf (opens in a new tab)
Primary USDA release document linked from the existing Citrus Rootstocks index. Identifies selection code BS95-V5-10/US-1281, the 1995 cross, and stated research and release roles; reports Hamlin scion trials at flatwoods and ridge sites. Trial yield and quality findings concern grafted Hamlin, not US-1281 fruit. The PDF date/signature lines are blank; no exact publication day is assigned.
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Rayane Barcelos Bisi, Ute Albrecht, and Kim D. Bowman · HortScience · 2020-03-05
https://doi.org/10.21273/HORTSCI14598-19 (opens in a new tab)
Reports rootstock seed-tree fruit, seed, and seedling characteristics. The US-1281 sample was nine planted seeds in one replicate; eight seedlings were assessed with SSR, and no true-to-type seedlings were observed in that sample. This is a one-location, one-season nursery study; seed-tree fruit data are not grafted scion fruit. The same article was reprinted in the 2019 Florida State Horticultural Society proceedings and is one study.
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kumin · Tropical Fruit Forum · 2024-03-01
https://www.tropicalfruitforum.com/index.php?msg=515327 (opens in a new tab)
Relevant post #8 by Kumin, 1 March 2024; his profile lists Pennsylvania 6b. He reports his US-1281 had not yet fruited as of that post and was grown in soil in a minimally heated tunnel. This participant report gives no US-1281 cold minimum or survival result; the 2°F survival report elsewhere in the thread concerns Bishop. Repeated quotations are not independent reports.
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kumin · Tropical Fruit Forum · Cold Hardy Citrus · January 21, 2023
https://www.tropicalfruitforum.com/index.php?topic=30891.msg481386#msg481386 (opens in a new tab)
In reply #481386, kumin describes US-1281 foliage as rather Poncirus-like, says it shows no deciduousness, and reports no cold damage in the high-tunnel discussion. The post gives no temperature, plant age, rootstock setup, or geographic location.
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