Import from Hawaii (Special Permit from Sacramento). Original import had tristeza, removed by thermotherapy. [Processed] through CCPP as required for foreign imports. (EM Nauer, 1986)This is apparently one of 6 pummelos and pummelo hybrids imported from Hawaii in the mid- to late 1980's (letter from Richard Hamilton dated 03/19/1984 on file), the others being Kao Phuang, Thong Dee, Haiku B, Pauthel, and Puma. Several of these were already in the collection, so it is not clear why they were imported. They were acquired at the request of Bill Bitters. Possibly he felt the existing accessions were not typical. More information on Kao Pan is available in Reinking and Groff (1921), Groff (1927), Hodgson, 1967 (pp 536 - 537), and Martin and Cooper (1977). (RR Krueger, 2014-06-09)
Additional information on Kao Pan is available from Citrus Variety Collection and Citrus Clonal Protection Program.