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<p>The fungus <i>Graphium euwallaceae</i> is associated with ambrosia beetles (<i>Euwallacea</i> sp.) and has been found in e.g. avocado trees, box elder, and evergreen maple. It is known to occur in California, Vietnam, and Australia. In early 2025, the fungal isolate AGQMy-2025-02 was obtained from a borehole in <i>Barringtonia acutangula</i> (Lecythidaceae) in connection with an outbreak of the <i>Euwallacea</i> beetle in a tropical greenhouse in Germany and suspected to be <i>G. euwallaceae</i>. A combination of morphological and molecular methods employing barcoding across four gene regions (ITS, TEF1-α, SSU and LSU) and phylogenetic reconstruction based on ITS and TEF1-α was used to identify this isolate as <i>G. euwallaceae</i>. This is apparently the first detection of the fungus in Europe. There is no information, that <i>G. euwallaceae</i> is regulated as a quarantine pest in any plant health regulation, and it is so far neither listed in the annexes to Regulation (EU) 2019/2072 nor by the European and Mediterranean Plant Protection (EPPO). This paper describes the diagnosis and presents a pest risk analysis for this fungus.</p>

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First report and pest risk analysis of the ambrosia beetle associated fungus Graphium euwallaceae in Germany

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月15日

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  • Gritta Schrader,
  • Katja Boldt-Burisch,
  • Björn Hoppe,
  • Clovis Douanla-Meli

摘要

The fungus Graphium euwallaceae is associated with ambrosia beetles (Euwallacea sp.) and has been found in e.g. avocado trees, box elder, and evergreen maple. It is known to occur in California, Vietnam, and Australia. In early 2025, the fungal isolate AGQMy-2025-02 was obtained from a borehole in Barringtonia acutangula (Lecythidaceae) in connection with an outbreak of the Euwallacea beetle in a tropical greenhouse in Germany and suspected to be G. euwallaceae. A combination of morphological and molecular methods employing barcoding across four gene regions (ITS, TEF1-α, SSU and LSU) and phylogenetic reconstruction based on ITS and TEF1-α was used to identify this isolate as G. euwallaceae. This is apparently the first detection of the fungus in Europe. There is no information, that G. euwallaceae is regulated as a quarantine pest in any plant health regulation, and it is so far neither listed in the annexes to Regulation (EU) 2019/2072 nor by the European and Mediterranean Plant Protection (EPPO). This paper describes the diagnosis and presents a pest risk analysis for this fungus.