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Eduardo J. Chica and L. Gene Albrigo

temperature and photoperiod on flower induction and inflorescence development in sweet orange ( Citrus sinensis L. Osbeck) J. Hort. Res. 44 311 320 Muñoz Fambuena, N. Mesejo, C. Carmen González-Mas, M. Primo-Millo, E. Agustí, M. Iglesias, D.J. 2011 Fruit

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Dinesh Phuyal, Thiago Assis Rodrigues Nogueira, Arun D. Jani, Davie M. Kadyampakeni, Kelly T. Morgan, and Rhuanito Soranz Ferrarezi

using the St. Lucie West weather station in 2017–18 and 2018–19. Plant material. Four-year-old ‘Ray Ruby’ grapefruit trees on Kuharske citrange ( Citrus sinensis × Poncirus trifoliata ) rootstock planted in Sept. 2013 was used as plant material. The

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Ariel Singerman, Stephen H. Futch, and Brandon Page

rootstock variety on huanglongbing disease development in field-grown sweet orange ( Citrus sinensis ) trees Scientia Hort. 138 210 220 doi: 10.1016/j.scienta.2012.02.027 Bowman, K.D. McCollum, G. Albrecht, U. 2016 Performance of ‘Valencia

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Samuel Kwakye, Davie M. Kadyampakeni, Edzard van Santen, Tripti Vashisth, and Alan Wright

diameter, leaf Mn levels, and biomass accumulation of 2-year-old HLB-affected and HLB-free ‘Valencia’ [ Citrus sinensis (L.) Osbeck] trees under greenhouse conditions in Florida. Materials and Methods Site description and trial establishment

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Almudena Montoliu, Aurelio Gómez-Cadenas, and Rosa M. Pérez-Clemente

, shoot tip, and internodal seedling stem sections) from several citrus species ( Citrus sinensis , Poncirus trifoliata , C. acida , C. aurantifolia , and C. limon ) through the addition of plant growth regulators in various combinations and

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Craig E. Kallsen, Blake Sanden, and Mary Lu Arpaia

In the southern San Joaquin Valley, early-maturing navel orange [ Citrus sinensis (L.) Osbeck] cultivars such as Beck-Earli, Newhall, and Fukumoto produce the first harvestable navel orange fruit of the season in California. Before harvest may

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Sukhdeep Singh, Taylor Livingston, Lisa Tang, and Tripti Vashisth

trees ( Bassanezi et al., 2011 ), has resulted in a high reduction in citrus yield. As HLB has become an epidemic in Florida, the rate of preharvest fruit drop in sweet orange ( Citrus sinensis ) has risen from 12% in 2005–06 to 26% in 2018–19 (USDA

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Steven Pao, Peter D. Petracek, and G. Eldon Brown

Peeling and storage characteristics of citrus fruit infused with water or enzyme solution were compared. Fruit were vacuum- or pressure-infused with water or water-containing pectinase. The enzyme treatment did not affect peeling times of white or red grapefruit, oranges, or tangelos. Pressure and vacuum infusion methods produced similar results. Grapefruit and oranges infused with water had significantly less juice leakage and were firmer than fruit infused with enzyme. Microbial levels and respiration rates and ethylene emanation during storage were the same for enzyme- and water-treated fruit.

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Fabio De Pasquale, Salvatore Giuffrida, and Francesco Carimi

Minigrafting was used for rescue of tissue culture regenerants of the following four species of Citrus: sour orange (C. aurantium L. `AA CNR 31'), sweet orange [C. sinensis (L.) Osb. `Valencia Late'], lemon [C. limon (L.) Burm. `Femminello Comune'] and mandarin (C. deliciosa Tenore `Tardivo di Ciaculli'). The grafting was carried out with different scion types including shoots, roots, inverted roots and somatic embryos. This material was obtained in vitro from embryogenic style-derived callus. Seedlings of open-pollinated sour orange (C. aurantium L.), Cleopatra mandarin (C. reshni Hort. ex Tan.) and `Troyer' citrange [C. sinensis Osb. × Poncirus trifoliata (L.) Raf.] were used as rootstocks. Minigrafting of shoots, roots, inverted roots and embryos regenerated in vitro allowed successful rescue of these four species. Percentages of successful minigrafts ranged from 100% (shoots) to 2.5% (inverted roots). The probability of successful graft unions increased with the age of the rootstock. The final mean canopy leaf area (120 days after grafting) ranged from 5.2 cm2 (`Tardivo di Ciaculli' mandarin grafted on 6-month-old Cleopatra mandarin) to 157.9 cm2 (`Valencia Late' sweet orange grafted on 18-month-old Cleopatra mandarin). In this work we examined some of the variables which influenced minigrafting and we determined the efficacy of this method for rescue of in vitro regenerants of Citrus. This method is also suggested as a technique to produce a high percentage of viable plants from in vitro regenerants difficult to root.

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Kim D. Bowman

Bending was compared to cutting off for effectiveness in forcing growth of sweet orange and mandarin scions budded on `Carrizo' citrange, `Swingle' citrumelo, and 17 new hybrid citrumelo rootstocks. For both scion types, more than twice as many plants from the bending treatment than the cut treatment had growing scion buds at 12 weeks. This advantage of the bending treatment was similar for most scion/rootstock combinations except with sweet orange scion on `Carrizo', which produced outstanding bud growth from both forcing methods. Length of growing shoots at 12 weeks was >14 times longer from the bending than the cut treatment for both scions and with all rootstocks. Tree survival and yield of usable trees at 35 weeks old were also significantly better for the bending treatment than for the cut treatment. There was an overwhelming advantage to using the bending treatment instead of cutting off in forcing scion bud growth for propagating citrus trees on citrumelo rootstocks.