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April 30, 2026Forest Ecology and Management0 citationsOpen Access

Susceptibility of Douglas-Fir Provenances to Diplodia Sapinea in European Forestry

Susceptibility of Douglas-fir provenances used in European forestry to the emerging pine pathogen Diplodia sapinea

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Authors

ERElisabeth RitzerJPJakob Pancho PerleMSMartin Schebeck

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Overview

Randomized trial investigates disease resistance in Douglas-fir seedlings against Diplodia sapinea, highlighting the need for tolerant seed sources.

Key Points

  • This research aims to assess the susceptibility of Douglas-fir provenances to the pathogen Diplodia sapinea and identify variation in disease resistance.
  • Conducted a wound inoculation experiment on 300 two-year-old seedlings (30 per provenance) with a virulent isolate of D. sapinea.
  • Monitored disease symptoms and progression over 60 days, evaluating needle discoloration, phloem necrosis, and mortality rates.
  • Compared disease responses across ten provenances commonly used in Central Europe.
  • All provenances showed susceptibility to D. sapinea, but symptom severity and mortality rates varied.
  • Significant differences in phloem necrosis among provenances, particularly between South West Germany 1 and 2.
  • SW Germany 1 and La Luzette exhibited the lowest overall disease incidence across tested traits.

Cite This Study

Ritzer et al. (2026) studied this question.

synapsesocial.com/papers/69f2f0e31e5f7920c6386dc8https://doi.org/10.1016/j.foreco.2026.123813
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