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May 21, 2026Plant Disease

First occurrence of Alternaria alternata species complex causing leaf spot on common hop ( Humulus lupulus ) in Massachusetts

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Authors

NWN. D. WilliamsAmherst CollegeMKMinjeong KimDankook UniversityCBChang–Gi BackDankook University

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Implication

Randomized trial confirms pathogenicity of Alternaria alternata in common hop, indicating potential crop threats.

Key Points

  • To identify and confirm the pathogenicity of Alternaria alternata species complex causing leaf spot on common hop in Massachusetts.
  • Observed browning symptoms in common hop hopyard in Northfield, MA.
  • Samples were surface disinfested and cultured on PDA; PCR used for genomic characterization.
  • Pathogenicity confirmed via inoculation on rooted cuttings of different cultivars.
  • Lesions consistent with field symptoms developed on ‘Triple Pearle’ (24 hours) and PI 689630 (72 hours) post-inoculation.
  • Koch's postulates fulfilled with A. alternata reisolated from inoculated plants (4/12 wounds) but not from controls (0/9 wounds).
  • First report of A. alternata causing leaf spot on common hop in Massachusetts.

Cite This Study

Williams et al. (2026) studied this question.

synapsesocial.com/papers/6a0ea1c1be05d6e3efb60834https://doi.org/10.1094/pdis-11-25-2377-pdn
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Also Consider

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