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Powdery mildews on lilac in western North America include Phyllactinia syringae, sp. nov

Harold J Larsen1, Uwe Braun2, Cheryl Blomquist3

  • 1a Department of Horticulture, Western Colorado Research Center , Colorado State University , 3168 B .5 Road, Grand Junction , Colorado 81503.

Mycologia
|June 23, 2017
PubMed

Insights

Two new powdery mildew species, Erysiphe syringae and Phyllactinia syringae, were identified on lilac plants in North America. Phyllactinia syringae infects common lilac, while E. syringae affects Chinese and common lilac varieties.

Area of Science:

  • Plant pathology
  • Mycology
  • Botany

Background:

  • Lilac plants (Syringa spp.) are susceptible to various fungal diseases.
  • Powdery mildew is a common plant disease affecting numerous plant species.
  • Accurate identification of fungal pathogens is crucial for disease management.

Purpose of the Study:

  • To identify and describe the powdery mildew species affecting lilac in western North America.
  • To differentiate between Phyllactinia syringae and Erysiphe syringae based on host and symptomology.
  • To provide a basis for future research and management strategies.

Main Methods:

  • Field surveys in western North America to collect infected lilac samples.
  • Microscopic examination of fungal structures for morphological identification.
  • Comparison with existing taxonomic keys and literature for species confirmation.

Main Results:

  • Two powdery mildew species were identified on lilac: Erysiphe syringae and a new species, Phyllactinia syringae.
  • Phyllactinia syringae was exclusively found on common lilac, causing unobtrusive infections.
  • Erysiphe syringae was observed on Chinese lilac and occasionally common lilac, causing conspicuous foliar damage.

Conclusions:

  • The identification of Phyllactinia syringae expands the known diversity of powdery mildews on lilac.
  • Differential host and symptomology aid in distinguishing between these two powdery mildew species.
  • Understanding these pathogens' specificities is key for effective lilac disease management.
Keywords:
E. syringae-japonicaeErysiphe syringaePhyllactinia fraxiniS. × chinensis.Syringa vulgarismorphology

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