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Updated: Jun 23, 2026

A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates
11:48

A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates

Published on: October 28, 2021

Low Genetic Diversity and Broadly Distributed Haplotype Lineages Characterize Microdochium nivale and Typhula spp.

Fernanda Proano-Cuenca1, Shashini U Welmillage1, Ingerd Skow Hofgaard2

  • 1Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706, U.S.A.

Phytopathology
|June 22, 2026
PubMed

Insights

Snow mold fungi in turfgrass show limited genetic diversity and no geographic clustering, suggesting widespread dispersal of successful lineages. This genetic uniformity may influence turfgrass disease management strategies.

Area of Science:

  • * Plant Pathology
  • * Mycology
  • * Molecular Ecology

Background:

  • * Snow mold diseases impact amenity turfgrass globally in cool, moist climates.
  • * Caused by diverse fungal species, including *Microdochium nivale*, *Typhula incarnata*, and *Typhula ishikariensis*.
  • * Understanding genetic variation is crucial for effective disease management.

Purpose of the Study:

  • * To investigate phylogenetic relationships among snow mold fungal isolates.
  • * To assess genotypic variation within key snow mold species.
  • * To explore geographic distribution patterns and potential gene flow.

Main Methods:

  • * Multi-locus DNA sequencing of ITS, TEF, and RPB2 gene regions.
  • * Analysis of 50 fungal isolates collected from Norway and the United States.
  • * Phylogenetic and population genetic analyses.

Main Results:

  • * Consistent and well-supported phylogenetic topologies were observed for each species.
  • * Lack of geographic clustering suggests widespread dispersal or gene flow.
  • * Limited genotypic variation was found, with dominant haplotypes in *M. nivale* and *T. incarnata*.

Conclusions:

  • * Successful snow mold lineages appear persistent and adapted to managed turfgrass.
  • * Genetic uniformity may indicate predictable responses to management practices.
  • * Further research is needed on the spread of adaptive traits in dominant lineages.
Keywords:
clonal lineagehaplotypephylogenysnow moldturfgrass

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