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World of CitrusWorld of CitrusUS SuperSour 2
Citrus Rootstocks
https://citrusrootstocks.org/rootstock-cultivars/ (opens in a new tab)
The index lists US SuperSour 2 parentage as Poncirus trifoliata × (Citrus aurantium × Citrus ichangensis) and its USDA release date as 2018. The table does not report selection, field performance, release contributors, or other historical events.
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USDA Agricultural Research Service
This shared USDA/ARS sheet gives US SuperSour 2's broad trifoliate × (sour orange × ichangensis) parentage and states release on 2 November 2018. Its Hamlin trial summary reports grafted sweet-orange scion yields; those are not intrinsic US SuperSour 2 fruit or yield results.
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Ute Albrecht; Fernando Alferez; John M. Chater; Mongi Zekri · UF/IFAS Extension
https://ask.ifas.ufl.edu/publication/HS1308 (opens in a new tab)
The 2026–2029 UF/IFAS guide summarizes US SuperSour 2 performance on the ridge and reports higher yield than standard sour orange under tested conditions. It describes good genetic uniformity among SS2 seedlings. This is extension synthesis, not a new trial; scion, site and management affect performance, and long-term data for new rootstocks are limited.
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Kim D. Bowman · HortScience / American Society for Horticultural Science · 2023-11-28
https://doi.org/10.21273/HORTSCI17466-23 (opens in a new tab)
Table 1 identifies SS2 parentage as Benecke trifoliate × (Chinotto sour orange × Citrus ichangensis) and lists release year 2018; the description reports good genetic uniformity among seedlings. A Lake County Hamlin trial planted in 2011 reports grafted sweet-orange scion results, not SS2 fruit. The article gives SS2–SS5 a collective 2000–2006 cross range, not an individual SS2 cross year.
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Ksenija Gasic; John E. Preece; David Karp · HortScience · 2020
https://doi.org/10.21273/HORTSCI50register-20 (opens in a new tab)
The US SuperSour 2 description reports a diploid Benecke trifoliate × (Chinotto sour orange × Citrus ichangensis) hybrid. It says suitability for uniform apomictic seed propagation had not been evaluated and recommends cuttings or micropropagation. This is a 2020 source-specific assessment, not a universal statement about later propagation performance.
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