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Vol.6, No. 2 Florida Citrus Nurserymen's Association 1996-97 Officers During the annual meeting at Lake Alfred CREC on April , 1996 the officers for the coming year were elected and installed. Most of last years officers were asked to serve a second term to maintain momentum and continuity in the development of the "Quality Tree Program". President Vice-President Treasurer Secretary Immediate Past President Directors-at Large Wallace Thompson Paul Harris Russell Stromsnes Gene Sauls Juice Quality & Yield of 6 Valencia Clones Bob Rouse and Charles Youtsey Florida orange juice quality standards require a minimum color score of 36 to qualify as Grade A. The 'Rohde Red Valencia' is a clone that has been selected for its high juice color score, but information is not available comparing juice color or among other juice quality factors among 'Rohde Red Valencia' selections or with other 'Valencia' clones. In the citrus budwood foundation grove at the Southwest Florida Research and Education Center at Immokalee, three years of data were collected from six 'Valencia' scion clones on 16 different rootstocks for juice quality analysis. The clones were nucellar seedlings VS-F-55-28-X-E and VS-SPB-1-14-19-X-E, old-line V-10-12-7-X-E and V-51-3-3(STG-64G-4)-X-E, and 'Rohde Red Valencia' RRV-472-3-26(STG-31-18)-X-E and RRV-472-11-43(STG-19-2)-X-E. Rootstocks were Cleopatra and Sun Chu Sha mandarins, calamandarin, sour orange, Smooth Flat Seville, Swingle and F80-18 citrumelos, Carrizo, Benton and C-35 citranges, Poncirus trifoliata, the interspecific hybrid Ridge Pineapple x P. trifoliata (1573-26), Rangpur lime x Troyer citrange, Valencia seedling, Duncan grapefruit, and Vangasay lemon. Trees were planted in 1989. A 40-lb-fruit sample (approximately 100 fruit) was taken from each 'Valencia' clone on each rootstock in May of 1993, 1994, and 1995. Juice from each sample was obtained using an FMC® model 091-B standard juice extractor (Food Machinery Corporation, Lakeland, FL). Juice was analyzed for maturity factors of total soluble solids (TSS) as ° Brix, titratable acid, and juice color score using a HunterLab® D45-2 Citrus Colorimeter (Hunter Assoc., Fairfax, VA). Percentage acid was significantly lower for RRV-472-11-43 than the other 'Valencia' clones, including the other Rohde selection RRV-472-3-26 (see table). The two 'Rohde Red Valencia' clones as a group had lower Brix than the old-line or nucellar clones, although RRV-472-11-43 was comparable to standard Valencia. The old-line clones and nucellar VS-SPB-1-14-19 had the highest TSS. The 'Rohde Red Valencia' selection RRV-472-3-26 had the lowest Brix/acid ratio with 19.3. 'Rohde Red Valencia' selection RRV-472-11-43 had comparable ratio to the old-line and nucellar clones. This was due primarily to the low acid content. Old-line V-10-12-7, nucellar VS-SPB-1-14-19, and RRV-472-11-43 had the highest ratios with 21.3, 21.1, and 21.1, respectively. Juice color was highest from 'Rohde Red Valencia' clones by more than one color score number. Mean color score for old-line and nucellar clones was 37.5 and 37.7, respectively. 'Rohde Red Valencia' mean juice color score was 38.9. There was significant difference between the two 'Rohde Red Valencia' clones. Clone RRV-472-11-43 at 39.2 was almost one-half color score number higher than RRV-472-3-26 at 38.8, which was more than one color score number higher than the mean of the old-line and nucellar clones at 37.6. Rootstock influence on juice quality across all 'Valencia' scion clones was minimal and generally what might be expected of young trees. Juice quality from trees on Cleopatra mandarin and Sun Chu Sha were comparable. Smooth Flat Seville and sour orange rootstocks produced similar juice quality as did Swingle citrumelo, Carrizo, Benton, and C-35 citranges with 'Valencia' scions.
The Quality Tree Program Phil Rucks, President Membership Dues Due Invoices have been sent out for the coming year. Please return these as quickly as possible to treasurer Lynn Ellis to keep your membership current. Voting within the nursery association on the mandatory registration program can be done only by paid up members. If you did not receive an invoice or would like to become a member please contact Lynn Ellis, Treasurer, Florida Nurserymen's Association, P.O. Box 12852, Ft. Pierce, Fl. 34979-2852. Phone (407) 465-3867. |
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