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Open access

Joseph Krystel, Huawei Liu, John Hartung, and Ed Stover

replicate and maintain populations in transgenic ‘Carrizo’ citrange ( Citrus sinensis × Poncirus trifoliate ), a widely used rootstock for commercial citrus. Protection of the roots of C Las-infected trees may confer benefit to the scion because

Open access

Lisa Tang, Garima Singh, Megan Dewdney, and Tripti Vashisth

. Hort. Sci. 70 357 374 10.1080/14620316.1995.11515306 Lord, E.M. Eckard, K.J. 1985 Shoot development in Citrus sinensis L. (Washington navel orange). I. Floral and inflorescence ontogeny Bot. Gaz. 146 320 326 10.1086/337531 Lord, E

Open access

Sameer Pokhrel, Bo Meyering, Kim D. Bowman, and Ute Albrecht

al., 2017a , 2020 ). Here we examined in detail the root growth and root architectures of ‘Valencia’ orange ( Citrus sinensis ) trees grafted on different rootstocks propagated by seed, cuttings, and tissue culture, and their influence on aboveground

Free access

Madhulika Sagaram and Jacqueline K. Burns

Citrus and Dates, Riverside, CA; and a commercial seed supplier (Willits and Newcomb), Arvin, CA. ‘Volkamer’ lemon ( Citrus volkameriana ) and ‘Carrizo’ citrange ( Citrus sinensis × Poncirus trifoliata ) rootstock plants were generated from seed

Free access

Matthew W. Fidelibus, Karen E. Koch, and Frederick S. Davies

change were consistent with a role for soluble sugars in GA 3 effects on color break. Materials and Methods Plant material. Fruit used in this study were from mature ‘Hamlin’ sweet orange [ Citrus sinensis (L.) Osb.] trees grown in

Free access

Naveen Kumar, Fnu Kiran, and Ed Etxeberria

Albrecht, U. Bowman, K.D. 2008 Gene expression in Citrus sinensis (L). Osbeck following infection with the bacterial pathogen ‘ Candidatus Liberibacter asiaticus’ causing huanglongbing Plant Sci. 175 291 306 Albrigo, L.G. Stover, E.W. 2015 Effect of

Free access

Ed Stover, David G. Hall, Jude Grosser, Barrett Gruber, and Gloria A. Moore

:// > Albrecht, U. Bowman, K.D. 2008 Gene expression in Citrus sinensis (L.) Osbeck following infection with the bacterial pathogen Candidatus Liberibacter asiaticus causing huanglongbing in

Free access

Concetta Licciardello, Biagio Torrisi, Maria Allegra, Fabiola Sciacca, Giancarlo Roccuzzo, Francesco Intrigliolo, Giuseppe Reforgiato Recupero, Paola Tononi, Massimo Delledonne, and Vera Muccilli

fruit ripening, and impaired fruit quality as previously reported for peach [ Prunus persica ( Sanz et al., 1997 )] and sweet orange [ Citrus sinensis ( Pestana et al., 2011 )]. Severe reductions in yield are associated with decreased leaf chlorophyll

Free access

Thomas A. Obreza, Robert E. Rouse, and Kelly T. Morgan

( Citrus sinensis L. Osb.) trees budded to Swingle citrumelo rootstock ( Citrus paradisi × Poncirus trifoliata L.) were planted in double rows on the beds. Rows were 6.7 m apart across the top of the beds and in-row tree spacing was 4.6 m (326 trees

Free access

Reginald S. Fletcher, Mani Skaria, David E. Escobar, and James H. Everitt

Phytophthora foot rot, caused by Phytophthora parasitica (Dast), can result in economic losses for the citrus industry in the Lower Rio Grande Valley of Texas. Therefore, locating foot rot-infected trees in citrus groves is important to citrus growers. Symptoms of the infection include leaf yellowing, canopy defoliation, twig dieback, and short growth flushes. This study evaluated the use of the latest remote sensing technology, that of airborne digital imagery, for the detection of citrus trees exhibiting mild symptoms of foot rot infection. Airborne color-infrared (CIR) digital imagery of two citrus orchards having problems with foot rot infection was acquired. In addition to the aerial digital imagery, ground spectroradiometric measurements were conducted to determine the visible and near-infrared (NIR) spectral reflectance differences between healthy and infected trees. These measurements were also used to help interpret the color tonal renditions between the trees. The CIR digital imagery distinguished infected from noninfected trees. The noninfected trees had a bright red-magenta color rendition, while the infected trees had a dull grayish red tonal response. The NIR spectroradiometric and digital readings were significantly lower for infected trees than for healthy ones (P ≤ 0.05), whereas the visible reflectance and digital data revealed no significant differences between the trees. The infected trees' dull tonal response in the CIR image was attributed to their lower NIR light intensity. These results indicated that digital imagery has potential for detecting foot rot-infected trees in citrus groves based upon NIR spectral differences. The advantage of airborne digital imagery is its real-time survey for quick field assessment.