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<p><i>Juglans regia</i> L. (English walnut) is an economically significant fruit crop worldwide. In Serbia, little attention has been given to walnut diseases, but twig dieback in the recent years has become an economically important disease in Serbia. To understand what the best approach for the control of the disease is, detection and identification of causal agents are necessary. Thirty-seven fungal isolates with twig dieback symptoms were sampled from 2021 to 2023 in walnut orchards within diverse districts across Serbia. Multi-locus sequence analysis by using five gene loci (ITS, tub, his, tef1-α, and cal) facilitated the identification of the causal agent as <i>Diaporthe eres</i>. The present study delivers the molecular characterization combined with morphological characterization of <i>D. eres</i> isolates related to <i>J. regia</i> in Serbia. Our findings present a new viewpoint into the population structure of <i>D. eres</i> complex associated with twig dieback disease on English walnuts. The data presented here may help to establish new perspectives for disease management and measures of control of this pathogen.</p>

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Occurrence of twig dieback of Juglans regia caused by Diaporthe eres in Serbia

  • 期刊论文

  • 发表日期：

    2025年4月5日

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  • Žarko Ivanović,
  • Tijana Jeremić

摘要

Juglans regia L. (English walnut) is an economically significant fruit crop worldwide. In Serbia, little attention has been given to walnut diseases, but twig dieback in the recent years has become an economically important disease in Serbia. To understand what the best approach for the control of the disease is, detection and identification of causal agents are necessary. Thirty-seven fungal isolates with twig dieback symptoms were sampled from 2021 to 2023 in walnut orchards within diverse districts across Serbia. Multi-locus sequence analysis by using five gene loci (ITS, tub, his, tef1-α, and cal) facilitated the identification of the causal agent as Diaporthe eres. The present study delivers the molecular characterization combined with morphological characterization of D. eres isolates related to J. regia in Serbia. Our findings present a new viewpoint into the population structure of D. eres complex associated with twig dieback disease on English walnuts. The data presented here may help to establish new perspectives for disease management and measures of control of this pathogen.