Vol. 60 No. 2 (2021)
Articles

First report of Didymosphaeria rubi-ulmifolii associated with canker and dieback of apple trees in southern Ethiopia

Abraham YIRGU
Central Ethiopia Environment and Forest Research Center, P.O.Box 33042, Addis Ababa
Alemu GEZAHGNE
Central Ethiopia Environment and Forest Research Center, P.O.Box 33042, Addis Ababa
Tesfaye ALEMU
College of Natural and Computational Sciences, Addis Ababa University P.O.Box 1176
Bio
Minette HAVENGA
Department of Plant Pathology, Stellenbosch University, Private Bag X1, Matieland, 7602
Lizel MOSTERT
Department of Plant Pathology, Stellenbosch University, Private Bag X1, Matieland, 7602
Bio
Published September 13, 2021
Keywords
  • Malus pumila,
  • Paraconiothyrium brasiliense,
  • stem canker
How to Cite
[1]
A. YIRGU, A. GEZAHGNE, T. ALEMU, M. HAVENGA, and L. MOSTERT, “First report of Didymosphaeria rubi-ulmifolii associated with canker and dieback of apple trees in southern Ethiopia”, Phytopathol. Mediterr., vol. 60, no. 2, pp. 229-236, Sep. 2021.

Abstract

Cultivation of apple trees in the highlands of Ethiopia began in 1955. In 2014, blistering of the bark due to cankers on the main stems mostly below the grafting points, followed by dieback and eventually death of apple trees, was observed in apple orchards in the Hadiya Zone in Ethiopia. This study aimed to identify the causal agent of canker and dieback symptoms on the apple trees. Symptomatic trunks from 20 trees (ten per cultivar) were sampled. Isolations were performed from ten trunks (five per cultivar). Fungus colonies with similar cultural features were obtained from all the samples, and the morphology of a representative isolate was characterized. Phylogenetic analyses of the concatenated internal transcribed spacers 1 and 2 and 5.8S rRNA gene, large subunit and actin gene regions confirmed the identity of two isolates as Didymosphaeria rubi-ulmifolii. Pathogenicity was confirmed for one isolate by inoculations of healthy branches of ‘Anna’ and ‘Dorsett Golden’ apple trees resulting in lesion formation, and subsequent re-isolation of the inoculated fungus. This study is the first report of D. rubi-ulmifolii associated with dieback of apple trees. This pathogen caused death of more than 26% of apple trees in one commercial orchard, and could cause severe losses for smallholder apple growers in Ethiopia. Future studies are required to assess the magnitude, distribution and management options of this economically important canker disease in Ethiopia.

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