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February 2, 2026Journal of Phytopathology

Temporal Dynamics of Neonectria ditissima Spore Release From Whole and Shredded Branches of ‘Gala’ and ‘Fuji’ Apple Cultivars

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Authors

MPMarilia Feliciano Goulart PereiraDRDaiana Petry RufatoLRLeo André Rufato

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Overview

Monitoring spore release from branches of 'Gala' and 'Fuji' apples, indicating challenges for managing European canker.

Key Points

  • This study aims to investigate the spore release dynamics of Neonectria ditissima from whole and shredded apple branches.
  • Monitored spore release from whole and shredded branches of 'Gala' and 'Fuji' apple trees during 2023-2025.
  • Placed branches in spore-trap boxes to quantify airborne ascospores and conidia weekly.
  • Shredded branches using a hydraulic mower before monitoring spore release.
  • Ascospores were the dominant spore type, showing higher release than conidia.
  • Whole symptomatic branches yielded the highest spore release, particularly in 'Gala'.
  • Shredding reduced spore output but did not eliminate inoculum viability, with shredded branches still releasing spores.
  • Both symptomatic and asymptomatic branches released spores, indicating latent infections.
  • Spore-release peaks coincided with rainy periods, highlighting moisture's role in spore discharge.

Cite This Study

Pereira et al. (2026) studied this question.

synapsesocial.com/papers/6980fe13c1c9540dea80fe68https://doi.org/10.1111/jph.70246
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