Mount Vernon Northwestern Washington Research and Extension Center

Small Fruit Pathology

Small Fruit Pathology Projects

Current Projects


Ecology and epidemiology of Botrytis cinerea causing fruit rot of red raspberry

O. Kozhar, T.L. Peever and D.O.C. Harteveld

  • Pathways and timing of flower and fruit infection by Botrytis cinerea related to environmental conditions
  • Ecology of raspberry flowers and fruit including potential antagonistic mycoflora

Host specificity and gene flow among Botrytis cinerea populations infecting small fruit in the Pacific Northwest

O. Kozhar, T.L. Peever, N.J. Grünwald and D.O.C. Harteveld

  • Determine population structure of B. cinerea  infecting raspberry, blueberry and strawberry in PNW
  • Test hypothesis that B. cinerea is a broad host range pathogen
  • Estimate gene flow of fungicide resistance alleles among populations infecting different small fruit hosts

Epidemiology and control of mummy berry of blueberry

D.O.C. Harteveld and T.L. Peever

  • Determine timing of primary inoculum release for mummy berry pathogen Monilinia vaccinii-corymbosi related to host phenology and weather data
  • Develop predictive model for mummy berrry spore release to improve timing of disease control measures
Fungicide resistance of B. cinerea and M. vaccinii-corymbosi infecting berries in the Pacific Northwest

T.L. Peever, D.O.C. Harteveld and D. Dutton

  • Determine frequencies of resistance to fungicides commonly used for control of Botrytis fruit rot of raspberry and blueberry
  • Determine baseline resistance levels to fungicides commonly used for control of mummy berry
  • Development of fungicide resistance management strategies


Past Projects


Overwintering biology of Monilinia vaccinii-corymbosi and development of cultural control to manage mummy berry in organic blueberry production.

J. Florence and J. Pscheidt

  • Classify the stages of overwintering with terminology that will allow
    for communication of findings around the world
  • Determine the importance of light for completion of the overwintering
    life cycle including action spectra and intensity.
  • Determine the efficacy of mulching for disease control and specify
    timing, depth, and usefulness of on-farm sanitation practices.

Biology and Management of Botrytis on Red Raspberry

L. A. Jones and J. W. Pscheidt

  • Determine which species of Botrytis are involved in fruit rot and cane Botrytis of red raspberry
  • Genetic analysis and comparison of Botrytis populations that cause fruit rots to those that cause cane lesions
  • Determine if there is evidence for host specialization of Botrytis isolates that overwinter as sclerotia on raspberry canes.
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