CRC 4220

VI 793

Photo by M. Roose

Source: Received as budwood from CCPP via the UCR Breeding Program, 2009.

Parentage/origins: Citrus sunki and Swingle trifoliate orange

Rootstocks of accession: Carrizo citrange, C-35 citrange

Season of ripeness at Riverside: Unknown

Notes and observations:

This is one of three rootstocks ('Bitters', 'Carpenter', and 'Furr') originally hybridized at the USDA US Date and Citrus Station in Indio, California, and developed further by the University of California, Riverside. This selection was named in honor of the late Dr Bill Bitters. According to the developer (see websites below), 'Bitters', "...produces a small tree, with high yield relative to canopy volume. Young trees on this rootstock showed good tolerance to freezing. Fruit quality of late navels was good and granulation was no worse than fruit on 'Carrizo' or 'C35'. It is tolerant to CTV, moderately tolerant to Phytophthora parasitica, not very tolerant of citrus nematode, and very tolerant of calcareous soil. 'Bitters' is considered promising as a replacement for sour orange rootstock for grapefruit in Texas." Additional information available on the developer's website includes a general summary and a trial summary. (RR Krueger, 07/15/2010)

‘Carpenter’ produces medium to large trees, with good yield. Young trees on this rootstock showed moderate tolerance to freezing. Fruit quality of late navels was good and granulation was no worse than fruit on ‘Carrizo’ but was slightly worse than on ‘C-35’. It is tolerant to CTV, moderately tolerant to P. parasitica, very tolerant of citrus nematode, and moderately tolerant of calcereous soil.

Availability: Commercially available in California through the Citrus Clonal Protection Program.

USDA Germplasm Resources Information Network page for Carpenter C-54 citrange

Bibliography:

"Descriptions of new varieties recently distributed from the Citrus Clonal Protection Program", Siebert, T., Krueger, R., Kahn, T., Bash, J., Vidalakis, G., Citrograph, March/April 2010, pgs 20-26.

(more information can be found at http://plantbiology.ucr.edu/faculty/new%20citrus%20rootstocks%202009.pdf)