| 0 | PI 539831 | 'Rangur X Troyer' | Citrus sp. | California, United States | RIV | | | 1990 | DEVELOPED | 1954 | | | | | Rootstock | This accession was developed at the US Date and Citrus Station and apparently sent to Florida (presumably the USHRL) at some point. It was re-imported into California by CCPP as a promising rootstock in the late 1980's, apparently at the request of Mike Roose. "M Roose reports that this is a desired rootstock and may be needed for industry trial release here [California]. Tentative plan is to process for the variety collection...foundation set + CB at Lindcove. M Roose also [says] that this accession is Phytophthora resistant to a degree." (EM Nauer, 04/1988) "In the nursery it produces vigorous, unbranched seedlings which are easy to bud. Seedling tests indicate that it is more susceptible to Phytophthora parasitica than Carrizo, but survival of field trees has been excellent. It is resistant to tristeza but susceptible to exocortis...Soil adaptation is not yet well characterized, but it has grown well on a wide rnage of soils in Florida...[Trees] gornw on [this accession] have a moderate growth rate resulting in trees 50 - 75 % of the height of those on Carrizo. We believe its overall effect on tree size will be simialr to that on C-35 citrnage. Yield relative to tree size is good to excellent in most trials [as is fruit quality]. Trees on this cultivar also showed moderate cold tolerance under Florida conditions. Ocerall it appears to be a rootstock worth of trial in higher density plantings. On the other hand it has not known advantages over C-35 citrange and somewhat poorer disease resistance." (ML Roose, "New Rootstock Cultivar Descriptions", CCNS Newsletter, Spring 1991, summarizing Castle et al, Proc Fla Hort Soc, 99:33-35, 1986). (RRK, 09/2006) | 1434767 | PI 539831 |
| 1 | PI 539820 | 'C-32' | Citrus sp. | California, United States | RIV | | | 1990 | DEVELOPED | 1951 | | | | | Cultivar | According to information received from the developer (ML Roose, 1989), C32 "...is tolerant to tristeza, and reasonably tolerant to Phytophthora and citrus nematode (at least as tolerant as Troyer). We do not know its reaction to exocortis, but recommend that only virus-free scions be used. Based on trials at [University of California, Riverside], Lindcove [Field Station, Tulare County], and a few trees in Pauma Valley, navel and Valencia oranges, Minneola tangelos, and Lisbon lemons budded on C-32 are large vigorous trees with high yields, Compatibility with Eurekas has bnot been tested. Fruit quality is simialr to that of trees on Troyer. Despite these attractive characteristics, two major problems limit use of C-32 citrange. First, it produces few fruit, and most fruit are seedless or nearly so. The average numnber of seed per fruit is often less than one. The second problem is that seedlings are somewhat variable. We have studied this problem in detail using biochemical markers to determine which seedlings are nucellar vs zygotic. In most seedlots we observe about 10 % zygotic seedlings (similar to the frequency in Swingle citrumelo). However, among nucellar seedlings, leaf morphology is much more variable than Troyer or Swingle. Therefore, the percentage of off-type seedlings appears higher than 10 %, and it is difficult to identify true-to-type seedlings. The consequneces of budding trees on off-type seedlings of C-32 are not known, but certainly some of the trees will not perform as expected. The obvious solution to both problems is for an enterprising nurseryman to develop a method for vegetative propagation of C-32, either as srooted cuttings or through tissue culture. The yield advantage seen in trials at Lindcove supports charging a premium for the trees, provided that the large tree size is desired by gowers." Additional information is available in the release notice (citation below) and from the UC Riveside Citrus Variety Collection. (RR Krueger, 12/31/2012) | 1434756 | PI 539820 |
| 2 | PI 539821 | 'C-35' | Citrus sp. | California, United States | RIV | | | 1990 | DEVELOPED | 1951 | | | | | Cultivar | According to information received from the developer (ML Roose, 1989), C-35 "...is tolerant to tristeza, adn more tolerant to Phytophthora than Troyer. It is highly resistant to citrus nematode. Reaction to exocortis is not known, but we recommend using only virus-free scions. Based on trials at [University of California, Riverside], Lindcove {Field Station, Tulare County], and a few trees in Pauma Valley, trees budded on C-35 are usually somewhat smaller than those on Troyer, and very productive for their size. This rootstock is suitable for planting at somewhat higher than normal density with most scions, but our limited observations suggest that tree size depends on scion in as yet unpredictable ways. For example, in recent measurements of 12 year-old trees at LIndcove, canopy volume relative to trees on Troyer was: navel 65 %, Valencia 85 %, Lemon 76 %, Minneola 91 %. The only difficulty with C-35 has been that navel orange trees in a trial at UCR did not bear well after the first 2 or 3 crops. The reason for these poor yiels is unknown. However, the trees at Lindcove are now 12 years old and continue to bear well for their size. Also, many navels in the Variety Collection at UCR have been budded on C-35 and planted between 1983 and 1985. These continue to produce well. Therefore, while we are still somewhat hesitant to recommend that C-35 be used with navels, most evidence suggests that this combination will perform well." Additional information is availalbe in the release notice (citation below) and from the UC Riveside Citrus Variety Collection. (RR Krueger, 12//31/2012) | 1434757 | PI 539821 |
| 3 | PI 539853 | 'SINTON CITRANGEQUAT' | Citrus hybr. | California, United States | RIV |  | | 1968 | DONATED | 01/01/1968 | | | | | Cultivar | See The Citrus Industry, Vol 1, p 584. | 1434789 | PI 539853 |
| 4 | PI 539841 | 'Citranguma OPS' | Citrus sp. | California, United States | RIV | | | 1962 | DONATED | 07/25/1962 | | | | | Cultivar | Notes from Paul Moore, Thermal: This is Citranguma -- W-N Seed No S-302. Seed was collected from trees in a hedgerow designated "C-1" at the Texas Agricultural Experiment Station #19 at Crystal City, Texas (Winter Haven Station). Their accession card states that five plants were sent by Yarnell to Mortensen in 1942." (Anonymous comment ca 1962) Foliage mostly trifoliate - some twigs unifoliate. Fruit medium sweet orange size, round, rind light-medium orange in color; moderately rough, about like a citrange. Rind medium thick, flesh light orange. Not edible - flavor bitter and sour. Seeds few. (EM Nauer, 01/18/1989) This apparently was derived from open pollinated seed sent from the TAE to WN. There is no mention of citranguma in Olson et al, 1961, and it is not known how this might be related (if at all) to the classical trifoliate hybrids produced by USDA in the early 20th century. (RR Krueger, 02/20/2013) | 1434777 | PI 539841 |
| 5 | PI 539843 | 'GLEN CITRANGEDIN' | Citrus sp. | California, United States | RIV | | | 1962 | DONATED | 01/01/1962 | | | | | Cultivar | | 1434779 | PI 539843 |