Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Italie → Further investigations on the putative causal agent/s of the emerging Volkamer lemon disease threatening the citrus industry in Egypt

Istituto Agronomico Mediterraneo di Bari (IAMB) 2017

Further investigations on the putative causal agent/s of the emerging Volkamer lemon disease threatening the citrus industry in Egypt

Hanani, Arafat

Titre : Further investigations on the putative causal agent/s of the emerging Volkamer lemon disease threatening the citrus industry in Egypt

Auteur : Hanani, Arafat

Etablissement de soutenance : Istituto Agronomico Mediterraneo di Bari (IAMB) - Centre international de hautes études agronomiques méditerranéennes (CIHEAM)

Grade : Master of science : Integrated pest management of Mediterranean fruit crops 2017

Résumé
Volkamer disease is an emerging serious rootstock disease appeared to affect Volkamer lemon rootstock in the Mediterranean basin when tolerant rootstocks were introduced to control citrus tristeza disease. The disease is devastating citrus grown in the Egyptian newly reclaimed land. Diseased trees are usually stunted, and scraping the bark reveals gum deposits, phloem discoloration, and stem pitting. These symptoms resemble those of cachexia on mandarin and gummy bark disease on sweet orange. The disease incidence was correlated with hot climate and transmission potency, which has drawn the attention to consider citrus viroids and/or phytoplasmas as a putative causal agent. Molecular detection and characterization of several citrus viroids were performed on previously collected samples belonging to the newly reclaimed land in Egypt. Meanwhile, a biological assay of infected material was included in this investigation . Interestingly, all the assays disclosed and confirmed the absence of phytoplasmas. Whereas, HSVd and CBCVd were the most prevalent detected viroids in the symptomatic samples. Molecular characterization and biological indexing confirmed the severity of both viroids, indicating that the volkamer disease could be associated with single or mixed infection involving HSVd and CBCVd.

Mots clés : CITRUS TRISTEZA VIRUS ; DISEASES ; MEDITERRANEAN COUNTRIES ; ROOTSTOCKS

Présentation (IAMB Library)

Page publiée le 12 mai 2020