National programme for the production of certified citrus plants in Tunisia

Transcription

1 National programme for the production of certified citrus plants in Tunisia Mattson C. in Martelli G.P. (ed.), D'Onghia A.M. (ed.). Proceedings of the Mediterranean network on certification of citrus Bari : CIHEAM Options Méditerranéennes : Série B. Etudes et Recherches; n pages Article available on line / Article disponible en ligne à l adresse : To cite this article / Pour citer cet article Mattson C. National programme for the production of certified citrus plants in Tunisia. In : Martelli G.P. (ed.), D'Onghia A.M. (ed.). Proceedings of the Mediterranean network on certification of citrus Bari : CIHEAM, p (Options Méditerranéennes : Série B. Etudes et Recherches; n. 21)

2 C. Cherif Laboratoire de Virologie Végétale Ariana Tunis - Tunisia - A outline on the existing the of in Tunisia 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 (Cm) 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, to 19 is mainly due to the supply of Options Méditerranéennes, Série B /no21,- Proceedings of the Mediterranean Network on Certification of Citrus

3 82 C. The following - Sweet (46.9%), Navel (5.8%), 18,1% Valencia late (2.6%) etc. - Clementine 16,6% - - Lemon - 3,6% - 3% in the month of mainly by to about 20% of the those of developed yields still The 8th ( ) 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 it is addition, the National in Tunisia comes 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 et des the the of The main objectives This to aims at cleaning the main Tunisian clean des

4 programme for the production of certified citrus in plants Tunisia 83 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 - sanitation of selected the detection of - evaluation of the biological indexing in diseases. 2) of and of the establishment of: - two the of (3 to 5 plants ( a foundation block multiplication in the that will budwoods to the of -tested. 3) of new to the of in Tunisia in of new of To 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 and clementine. the position of the

5 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 samples have been found. the of in the now, no positive