Mattson C.
in
Martelli G.P. (ed.), D' Onghia A.M. (ed.).
Proceedings of the Mediterranean network on certification of citrus. 1995-1997 Bari : CIHEAM
Options Méditerranéennes : Série B. Etudes et Recherches; n. 21 1998
pages 81-84
Article available on lin e / Article dispon ible en lign e à l’adresse :
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--- To cite th is article / Pou r citer cet article
--- Mattson C. N ation al programme for th e produ ction of certified citru s plan ts in Tu n isia. In : Martelli G.P. (ed.), D 'Onghia A.M. (ed.). Proceedings of the Mediterranean network on certification of citrus. 1995-1997. Bari : CIHEAM, 1998. p. 81-84 (Options Méditerranéennes : Série B. Etudes et Recherches; n. 21)
---
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C. Cherif
Laboratoire de Virologie Végétale Ariana
Tunis
-Tunisia
-
A outline on the existing the of inTunisia is given. A out to clean
diseases by the use of shoot-tip
a in
words: Tunisia
-
Un bref aperçu est donné du progranme actuellement en cours pour la production d'agrumes certifïés en Tunisie. Un projet a été élaboré pour débarasser le matériel agrumicole de la tisteza, de la psorose, du stubborn et des maladies à viroïdes en utilisant le micro-greffage. Le virus de la tristeza des agrumes ( C m ) n'a jamais été détecté pendant les prospections réalisées dans des vergers d'agrumes.agrumes, virus, virus similaires, certification, projet, Tunisie
in in the a
is as 300 to 500 mm
is used in
The total is the of which is located in the
The the last decade
188,000 to 240,000 14 to 19
is mainly due to the supply of
Options Méditerranéennes, Série B /no21, - Proceedings of the Mediterranean Network on Certification of Citrus
82 C.
The following
- Sweet (46.9%), Navel (5.8%), 18,1%
Valencia late (2.6%) etc.
-
Clementine 16,6%- - Lemon 5,6%
- 3,6%
-
3%in the month of about 20% of the
mainly by to
those of developed yields still The 8th
(1992-1996) quotes as main objective an of 270,000 to attain
this level, it is the management of and mainly to
the old plantations as well as to extend the establishing high quality plants. is
to point out that not all the planting in Tunisia comes
it is
addition, the National 1974-1976
was not the of such a has caused the
and fungal diseases.
Production of certified propagating material
Until 1993, was no the of plants of and
like Tunisia institutions and extension
in the but also disposes of planting The main actions
the ~ O ’ S , the sanitation of Tunisian have not shown positive
given the lack of human and 1993, Sanitation
out in des
et des the the of
This aims at cleaning the main Tunisian
to clean
The main objectives
l) Sanitation of the main by heat and shoot-tip
- selection of in the collections of the
selection includes the following sanguine, Washington Navel and Clementine.
- indexing of plants the
the use of (i) tests CTV detection; (ii)
techniques biological indexing in
the detection of diseases.
- sanitation of selected - evaluation of the
2) of and of the
establishment of:
- two the of (3 to 5
plants (10 -12
- a foundation block multiplication in the that will
budwoods to the of -tested.
3) of new to the of in Tunisia in
of To
of new adapted to Tunisian conditions was established at
Virus and virus-like diseases of citrus
The in 1993 by the symptomatological and is
biological indexing.
- Psorosis complex. on late
concave gum and blind pocket on the
-
Stubborn. This disease, caused by Spiroplasma citri, on Valencia late,- Cachexia xyloporosis. This disease, caused by a is in Tunisia. mechanically induces stem pitting in the trunk of infected below the
the position of the and clementine.
C.
- Exocortis. Since no used in Tunisia, this disease does not show symptoms. means of biological indexing on 861-S1, its in
- Symptoms of these two diseases in
lemon and sometimes in Washington Navel
- Tristeza. One of the most objectives of the is to the
of CTV in the Since 1993 the of is conducting a
the of in the now, no positive
samples have been found.
