Molecular identification and disease management of date palm sudden decline syndrome in the united arab emirates

Khawla J. Alwahshi, Esam Eldin Saeed, Arjun Sham, Aisha A. Alblooshi, Marwa M. Alblooshi, Khaled A. El-Tarabily, Synan F. Abuqamar

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Date palm orchards suffer from serious diseases, including sudden decline syndrome (SDS). External symptoms were characterized by whitening on one side of the rachis, progressing from the base to the apex of the leaf until the whole leaf dies; while the internal disease symptoms included reddish roots and highly colored vascular bundles causing wilting and death of the tree. Although three Fusarium spp. (F. oxysporum, F. proliferatum and F. solani) were isolated from diseased root samples, the fungal pathogen F. solani was associated with SDS on date palm in the United Arab Emirates (UAE). Fusarium spp. were identified based on their cultural and morphological characteristics. The internal transcribed spacer regions and large subunit of the ribosomal RNA (ITS/LSU rRNA) gene complex of the pathogens was further sequenced. Pathogenicity assays and disease severity indices confirm the main causal agent of SDS on date palm in the UAE is F. solani. Application of Cidely® Top (difenoconazole and cyflufenamid) significantly inhibited the fungal mycelial growth in vitro and reduced SDS development on date palm seedlings pre-inoculated with F. solani under greenhouse conditions. This is the first report confirming that the chemical fungicide Cidely® Top is strongly effective against SDS on date palm.

Original languageEnglish
Article number923
JournalInternational journal of molecular sciences
Volume20
Issue number4
DOIs
Publication statusPublished - Feb 2 2019

Keywords

  • Date palm
  • Disease management
  • Fusarium solani
  • Pathogenicity
  • Sudden decline syndrome
  • UAE

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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