Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Survey and Identification of Didymellaceae Causing Stem Canker Disease of Eucalyptus (E. camaldulensis) in Ethiopia

  • Admasu, Wendu (University of Gondar, College of Agriculture and Environmental Science) ;
  • Sintayehu, Assefa (University of Gondar, College of Agriculture and Environmental Science) ;
  • Gezahgne, Alemu (Ethiopian Environment and Forest Research Institute)
  • Received : 2022.08.08
  • Accepted : 2022.09.20
  • Published : 2022.09.30
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Abstract

Plantation forests are established by planting Eucalyptus tree species to provide timber and pulp for the construction industries and to meet the energy needs in Ethiopia. Besides the extensive Eucalyptus plantations in the country, fungal pathogen-related diseases are the main challenges to successful production and management. The disease survey was conducted in the Eucalyptus growing areas of Ethiopia during 2019/2020 and 2020/2021. The objective of this research was to assess the diseases associated with Eucalyptus plant species and identify the causal fungal species. Plants of E. camaldulensis were the dominant species in the survey fields and were severely associated with stem and branch canker diseases. Diseased samples were collected and fungal species were identified as Didymellaceae according to culture morphology and affirmed by internal transcribed spacer sequence analysis. In phylogeny, isolates in the study and a reference strain formed supportive monophyletic clades with strong 90% and 95% support with Didymella coffeae-arabicae and Didymella pinodella respectively. Pathogenicity tests revealed that Didymellaceae could infect E. camaldulensis. The findings are the first reports of Eucalyptus stem canker disease caused by Didymellaceae in Ethiopia.

Keywords

Acknowledgement

This research was financially supported by the Ethiopian Environment and Forest Research Institute (EEFRI) and the Ethiopian Environment Forest and Climate change Commission (EEFCC). We thank Dr. Wubalem Tadesse for his understanding and unreserved contribution in finding a fund for molecular analysis and CABI for molecular identification of part of the fungal isolates in the study.

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