Sources

African shaddock X Rubidoux trifoliate (opens in a new tab)

University of California, Riverside — Citrus Variety Collection

https://citrusvariety.ucr.edu/crc3969 (opens in a new tab)

Accessed September 18th

Further investigations on colonization of Poncirus trifoliata by the Asian citrus psyllid (opens in a new tab)

David G. Hall; Justin George; Stephen L. Lapointe · Crop Protection 72:112–118 · 2015

https://www.ars.usda.gov/ARSUserFiles/35403/Hall%20et%20al%202015%20Poncirus%20and%20ACP.pdf (opens in a new tab)

Hall et al. evaluated citrus-relative seedling populations for Asian citrus psyllid (ACP) colonization. Tables 3–4 list the named African shaddock × Rubidoux hybrid as CRC 3969. The observations are accession-specific experimental oviposition results, not Rubidoux parent traits, fruit results, or orchard-level HLB-control evidence.

Accessed September 29th

Analysis of Rootstocks and New Fungicides for Control of Phytophthora Root Rot and Gummosis in Arizona Citrus Groves (opens in a new tab)

Michael E. Matheron; Martin Porchas · University of Arizona, College of Agriculture; Citrus Research Report, Series P-105, report 370105 · 1996-09

http://hdl.handle.net/10150/220515 (opens in a new tab)

Table 1 (printed p. 21 / PDF p. 6) lists “S-27. African Shaddock x Rubidoux Trifoliate” in the P. parasitica block. The 1994 and 1995 cells display “--” and “**”; the report notes do not define these symbols. No numeric root-loss value or resistance classification is inferred. This is a greenhouse rootstock-seedling trial, not grafted-orchard performance.

Accessed October 2nd