LIBRO-CONGRESO-CITRUS

S18
S18P03
Effect of the rootstock on some agronomic traits of ‘Nules’ and ‘Nour’ clementines in the Souss
valey in south Morocco
Benyahia H. 1 , Benazzouz A. 1 , Beniken L. 1 , Handaji N. 1 , Kabbaj T. 2 , Essajid A. 2 , Chahidi B. 2 , Jacquemend E. 3 and Srairi I. 1
1 National Institut for Agricultural Research (INRA), Department of Plant Breeding and Phytogenetic Ressources Conservation,
Laboratory of Citrus Breeding, Kenitra, Morocco; 2 Domaines Abbès El Kabbage (DAK), Agadir, Morocco; and 3 Agricultural Research
Station of San Giuliano (INRA/CIRAD), Corse, France. hamidbenyahia2002@yahoo.fr
In Morocco, citrus cover about 105,000 ha. Clementine, a species concentrated in Souss and Moulouya
regions, accounts for 24% of citrus. Sour orange, the dominant rootstock in Morocco citrus groves, is
sensitive to Tristeza disease. Recently, many interesting rootstocks have been introduced from abroad. An
experimental trial was initiated in 1997 in the Souss Valley in South Morocco. It was aimed at evaluating
vegetative development, production and fruit quality of two clementine varieties (‘Nour and ‘Nules) grafted
on 22 different rootstocks. The trial was set on and soil composed of sand/loam with a moderate pH (8,5)
at a planting density of 6x3m. Plants grafted on Citrus macrophylla and Citrus volkameriana had the highest
canopy volume and exceeded significantly all the other combinations. These two rootstocks had also the
best yields over a period of 10 years. ‘Troyer’ citrange ranked third for ‘Nules’ and an even lower production
for ‘Nour’. For ‘Nour’, the second and third productive rootstock was ‘Cleopatra’ mandarin. Some hybrids
of Poncirus trifoliata improved significantly fruit quality (% of juice, Brix and acidity) in comparison to sour
orange. Fruits size was more improved by C. macrophylla and C. volkameriana especially for ‘Nour’. The most
efficient production was obtained with a dwarfing hybrid (‘Sunki’ mandarin x P. trifoliata), C. volkameriana for
‘Nules’, followed by ‘Nour’. We conclude that there are some advantages conferred by some new rootstocks
in comparison to sour orange. They permit a high productivity, earliness in fruit set and improved fruit quality.
S18P04
Behavior of ‘Navelina ISA 315’ on 15 rootstocks in Metaponto area, Basilicata, Italy
Mennone C. 1 , Ippolito A. 2 and Reforgiato Recupero G. 3
1 Azienda Agricola Sperimentale Dimostrativa Pantanello, Italy; 2 Università degli Studi “Aldo Moro”, Bari, Dipartimento di Scienze del
Suolo, della Pianta e degli Alimenti, Italy; and 3 CRA- Centro di Ricerca per l’Agrumicoltura e le Colture Mediterranee (CRA-ACM), Italy.
giuseppe.reforgiato@entecra.it
With the epidemic spread of Citrus Tristeza Virus (CTV) in Italian citriculture, sour orange, the most used
rootstock, has been almost completely abandoned, because of its susceptibility to the disease. Even if a
number of alternative rootstocks tolerant to CTV are available, their adaptability in specific conditions needs
to be tested. At the Pantanello research Station, Metaponto, Basilicata Region, Italy, Citrus tachibana, trifoliate
oranges ‘Yamaguchi’, ‘Argentina’, ‘Roubidoux’ and ‘Flying Dragon’, tangelo ‘Orlando’, sour oranges ‘S. Marina’
and ‘Platania’, Citrus macrophylla, ‘Ichang’ pummelo, citranges ‘Troyer’ and ‘Carrizo’, citrumelo ‘Swingle’,
‘Siamelo’, and ‘Poorman’s’ orange have been planted using as scion ‘Navelina ISA 315’ sweet orange. Since
1983 fruit production and quality were evaluated. In each combination ten trees were arranged in a complete
randomized block design. Among the tested rootstocks, interesting results in relation to fruit production
and quality were obtained with citranges, showing a vigour comparable to sour orange. Some plants grafted
on ‘Swingle’, showing a severe symptom of iron chlorosis, died. Trifoliate orange selections, mainly ‘Flying
Dragon’, induced a reduced canopy and low production.
S18P05
Influence of rootstock on the characteristics of clementine in the plain of Sibari, Italy
Russo G. 1 , Reforgiato Recupero G. 1 , Recupero S. 1 , Pietro Paolo D. 1 , Di Leo A. 2 and Filippelli S. 2
1 Centro di Ricerca per l’Agrumicoltura e le Colture Mediterranee (CRA-ACM), Italy; and 2 Centro Sperimentale Dimostrativo (ARSSA),
Mirto Crosia Italy. giuseppe.russo@entecra.it
In May of 2002, a trial was started in the plain of Sibari, a typical area for clementine in Italy, using four
varieties of clementines grafted on five rootstocks (sour orange, ‘Carrizo’ citrange, ‘Swingle’ citrumelo,
‘Flying Dragon’ trifoliate orange and ‘Alemow’). The clementine varieties were two early maturing
328 - VALENCIA CONFERENCE CENTER, 18th-23rd NOVEMBER 2012