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

First report and pest risk analysis of the Ambrosia beetle associated fungus Graphium euwallaceae in Germany | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article First report and pest risk analysis of the Ambrosia beetle associated fungus Graphium euwallaceae in Germany Gritta Schrader, Katja Boldt-Burisch, Björn Hoppe, Clovis Douanla-Meli This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7564751/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 15 Apr, 2026 Read the published version in Journal of Plant Diseases and Protection → Version 1 posted 5 You are reading this latest preprint version Abstract 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 on Barringtoniaacutangula (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. Euwallacea sp. ambrosia fungi plant health pest risk analysis diagnosis Full Text Cite Share Download PDF Status: Published Journal Publication published 15 Apr, 2026 Read the published version in Journal of Plant Diseases and Protection → Version 1 posted Reviewers agreed at journal 12 Sep, 2025 Reviewers invited by journal 12 Sep, 2025 Editor invited by journal 11 Sep, 2025 Editor assigned by journal 11 Sep, 2025 First submitted to journal 08 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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