Contact information

Dr. Nina Shishkoff

nina.shishkoff@usda.gov

Foreign Disease/Weed Science Research
1301 Ditto Avenue, Fort Detrick, MD 21702

Phone: 301-619-2877
Fax: 301-619-2880

Since joining the USDA-ARS in 2003 as a Research Plant Pathologist, Dr. Shishkoff's research emphasis has been on the pathways of disease spread. She discovered that the soil phase of the sudden oak death pathogen (Phytophthora ramorum) is significant for the spread of the pathogen, influencing regulations for movement of nursery material in the U.S. and internationally. Working with P. ramorum on nursery crops, she developed novel assays that allowed pathogen propagule production to be precisely quantified. She studied a downy mildew disease of Impatiens, the most important annual landscape plant, determining that the pathogen could spread from the roots, which has significance for production and breeding. She helped demonstrate that the spinach downy mildew is seed-transmitted. For boxwood blight, a serious disease of a beloved landscape plant, she worked on sanitation measures to reduce disease spread. Her research has fostered collaborations with plant breeders, extension professionals, and other scientists to solve complex agricultural problems based on stakeholder needs.

Research Emphasis

Dr. Shishkoff is currently studying downy mildews of ornamental plants and examining pathways of spread of new oomycete diseases in nurseries.

Projects

• Projects

  Integrative Genomic and Biological Approaches to Detect and Manage Emerging Foreign Fungal Plant Pathogens In-House Appropriated (D)   Accession Number:440440

  Diagnostics and Biological Approaches for Management of Emerging Oomycete Plant Pathogens In-House Appropriated (D)   Accession Number:442484

  Improving Boxwood Blight Mitigation through Innovation, Economic Analysis and Education Reimbursable Cooperative Agreement (R)   Accession Number:438761

Publications

• Publications

  • (Clicking on the reprint icon will take you to the publication reprint.)
  • Transmission of spinach downy mildew via seed and infested leaf debris -(Peer Reviewed Journal)
    Klosterman, S.J., Clark, K.J., Anchieta, A.G., Kandel, S.L., Mou, B., McGrath, M.T., Correll, J.C., Shishkoff, N. 2023. Transmission of spinach downy mildew via seed and infested leaf debris. Plant Disease. 108(4):951-959. https://doi.org/10.1094/PDIS-06-23-1225-RE.
    
  • Seedborne oospores as primary inoculum for spinach downy mildew-(Abstract Only)
    Clark, K.J., Anchieta, A.G., Kandel, S.L., Mou, B., Mcgrath, M.T., Correll, J.C., Shishkoff, N., Klosterman, S.J. 2023. Seedborne oospores as primary inoculum for spinach downy mildew. American Phytopathological Society Annual Meeting, August 12-16, 2023, Denver, Colorado.
    
  • Transmission of spinach downy mildew via seed and infested leaf debris-(Abstract Only)
    Klosterman, S.J., Clark, K.J., Anchieta, A.G., Kandel, S.L., Mou, B., McGrath, M.T., Correll, J., Shishkoff, N. 2023. Transmission of spinach downy mildew via seed and infested leaf debris. International Spinach Conference, May 1-2, 2023, Melbourne, Australia (virtual).
    
  • Germination of a spinach seedling infected with Peronospora effusa from seeds infested with oospores-(Abstract Only)
    
    
  • The impatiens downy mildew epidemic in the U.S. is caused by new, introgressed lineages of Plasmopara destructor with prominent genotypic heterogenicity and high evolutionary potential -(Peer Reviewed Journal)
    Salgado-Salazar, C., Catstroagudin, V., Leblanc, N.R., Daughtrey, M., Hausbeck, M., Palmer, C., Shishkoff, N., Warfield, C.Y., Crouch, J. 2023. The impatiens downy mildew epidemic in the U.S. is caused by new, introgressed lineages of Plasmopara destructor with prominent genotypic heterogenicity and high evolutionary potential. Plant Disease. https://doi.org/10.1094/PDIS-08-22-1872-RE.
    
  • First report of powdery mildew of American ginseng caused by Erysiphe heraclei in Tennessee and the United States -(Peer Reviewed Journal)
    Avin, F.A., Liyanapathiranage, P., Shishkoff, N., Swiggart, E., Gao, Y., Baysal-Gurel, F. 2023. First report of powdery mildew of American ginseng caused by Erysiphe heraclei in Tennessee and the United States. Plant Disease. 107:1950. https://doi.org/10.1094/PDIS-10-22-2310-PDN.
    
  • The epidemic since 2020: new insights into management of boxwood blight -(Abstract Only)
    Shishkoff, N. 2022. The epidemic since 2020: new insights into management of boxwood blight. APS Annual Meeting. 112-11-S3.1. https://doi.org/10.1094/PHYTO-112-11-S3.1.
    
  • Effect of temperature on lesion area of detached leaves of different boxwood cultivars infected with boxwood blight -(Abstract Only)
    Shishkoff, N., Xiao, Y. 2022. Effect of temperature on lesion area of detached leaves of different boxwood cultivars infected with boxwood blight. APS Annual Meeting. 112:11-S3.1. https://doi.org/10.1094/PHYTO-112-11-S3.1.
    
  • Peronosporaceae species causing downy mildew diseases of Poaceae, including nomenclature revisions and diagnostic resources -(Peer Reviewed Journal)
    Crouch, J.A., Davis, W.J., Shishkoff, N., Castroagudin, V.L., Martin, F.N., Michelmore, R., Thines, M. 2022. Peronosporaceae species causing downy mildew diseases of Poaceae, including nomenclature revisions and diagnostic resources. Fungal Systematics and Evolution. 9(1):43-86. https://doi.org/10.3114/fuse.2022.09.05.
    
  • Graminicolous downy mildew pathogens illustrated -(Abstract Only)
    Shishkoff, N., Castroagudin, V.L., Smallwood, E.L., Crouch, J. 2022. Graminicolous downy mildew pathogens illustrated. American Phytopathological Society Potomac Division Meeting. Vol. 112, No. 8.
    
  • Impact of Calonectria diseases on ornamental horticulture: Diagnosis and control strategies -(Peer Reviewed Journal)
    Aiello, D., Guarnaccia, V., Vitale, A., LeBlanc, N.R., Shishkoff, N., Polizzi, G. 2022. Impact of Calonectria diseases on ornamental horticulture: Diagnosis and control strategies. Plant Disease. 106(7):1773-1787. https://doi.org/10.1094/PDIS-11-21-2610-FE.
    
  • Sanitation: Disease Control from Start to Finish-(Book / Chapter)
    
    
  • Disinfestants-(Book / Chapter)
    
    
  • A diagnostic guide of Volutella blight affecting Buxaceae -(Peer Reviewed Journal)
    Yang, X., Chastrogudin, V.L., Daughtrey, M.L., Loyd, A., Weiland, G.E., Shishkoff, N., Baysal-Gurel, F., Santamaria, L., Salgado-Salazar, C., Lamondia, J., Crouch, J., Luster, D.G. 2021. A diagnostic guide of Volutella blight affecting Buxaceae. Plant Health Progress. 22:578-590. https://doi.org/10.1094/PHP-02-21-0052-DG.
    
  • Evaluation of boxwood cultivars for resistance to boxwood blight, 2020-(Peer Reviewed Journal)
    Becker, L.E., Adhikari, U., May, T., Shishkoff, N., Crouch, J., Cubeta, M.A. 2021. Evaluation of boxwood cultivars for resistance to boxwood blight, 2020. Plant Disease Management Reports. 15:OT008. Available: https://www.plantmanagementnetwork.org/pub/trial/pdmr/volume15/abstracts/ot008.asp
    
  • Comparative analysis of extracellular proteomes reveals effectors of the boxwood blight pathogens, Calonectria henricotiae and C. pseudonaviculata -(Peer Reviewed Journal)
    Yang, X., Mcmahon, M.B., Ramachandran, S.R., Garrett, W.M., Leblanc, N.R., Crouch, J., Shishkoff, N., Luster, D.G. 2021. Comparative analysis of extracellular proteomes reveals effectors of the boxwood blight pathogens, Calonectria henricotiae and C. pseudonaviculata. Bioscience Reports. 41(3):BSR20203544. https://doi.org/10.1042/BSR20203544.
    
  • First report: Co-infection of Sarcococca hookeriana (sweetbox) by Coccinonectria pachysandricola and Calonectria pseudonaviculata causes a foliar disease of sweetbox in Pennsylvania -(Peer Reviewed Journal)
    Castroagudin, V.L., Shishkoff, N., Stanley, O., Whitesell, R., Olson, T., Crouch, J.A. 2020. First report: Co-infection of Sarcococca hookeriana (sweetbox) by Coccinonectria pachysandricola and Calonectria pseudonaviculata causes a foliar disease of sweetbox in Pennsylvania. Plant Disease. 105(5):1568. https://doi.org/10.1094/PDIS-06-20-1198-PDN.
    
  • Rooting response of boxwood cultivars to hot water treatment and thermal sensitivity of calonectria henricotiae and C. pseudonaviculata in diseased boxwood -(Peer Reviewed Journal)
    Shishkoff, N., Cubeta, M.A., Miller, M.E. 2021. Rooting response of boxwood cultivars to hot water treatment and thermal sensitivity of calonectria henricotiae and C. pseudonaviculata in diseased boxwood. Journal of Environmental Horticulture. 39(1):1–10. https://doi.org/10.24266/0738-2898-39.1.1.
    
  • One clonal lineage of Calonectria pseudonaviculata is primarily responsible for the boxwood blight epidemic in the United States -(Peer Reviewed Journal)
    Castroagudín, V., Weiland, J.E., Baysal-Gurel, F., Cubeta, M., Daughtrey, M., Gauthier, N., Lamondia, J., Luster, D.G., Hand, F., Shishkoff, N., Williams-Woodward, J., LeBlanc, N., Yang, X., Crouch, J.A. 2020. One clonal lineage of Calonectria pseudonaviculata is primarily responsible for the boxwood blight epidemic in the United States. Phytopathology. 110(11):1845-1853. https://doi.org/10.1094/PHYTO-04-20-0130-R.
    
  • The oospore stage of Plasmopara obducens -(Peer Reviewed Journal)
    Shishkoff, N. 2019. The oospore stage of Plasmopara obducens. Mycologia. 111:632-646. https://doi.org/10.1080/00275514.2019.1601986.
    
  • Impact of ammonia on Calonectria pseudonaviculata and C. henricotiae, causal agents of boxwood blight -(Peer Reviewed Journal)
    Harvey, R.J., Davis, D.D., Shishkoff, N., Pecchia, J.A. 2019. Impact of ammonia on Calonectria pseudonaviculata and C. henricotiae, causal agents of boxwood blight. Compost Science and Utilization. 27:116-123. https://doi.org/10.1080/1065657X.2019.1586595.
    
  • Coccinonectria pachysandricola, causal agent of a new foliar blight disease of Sarcococca hookeriana -(Peer Reviewed Journal)
    Salgado-Salazar, C., Shishkoff, N., LeBlanc, N., Ismaiel, A.A., Collins, M., Cubeta, M.A., Crouch, J. 2018. Coccinonectria pachysandricola, causal agent of a new foliar blight disease of Sarcococca hookeriana. Plant Disease. 103(6):1337-1346. https://doi.org/10.1094/PDIS-09-18-1676-RE.
    
  • Spinach downy mildew: Advances in our understanding of the disease cycle and prospects for disease management -(Peer Reviewed Journal)
    Kandel, S.L., Mou, B., Shishkoff, N., Shi, A., Subbarao, K.V., Klosterman, S.J. 2019. Spinach downy mildew: Advances in our understanding of the disease cycle and prospects for disease management. Plant Disease. 103:791-803. https://doi.org/10.1094/PDIS-10-18-1720-FE.
    
  • Survival of lab grown Calonectria pseudonaviculata microsclerotia during small scale composting -(Peer Reviewed Journal)
    Harvey, R.J., Davis, D.D., Shishkoff, N., Pecchia, J.A. 2019. Survival of lab grown Calonectria pseudonaviculata microsclerotia during small scale composting. Bioresource Technology. 27(1):24-34. https://doi.org/10.1080/1065657X.2018.1536865.
    
  • Thermal sensitivity of Calonectria henricotiae and Calonectria pseudonaviculata conidia and microsclerotia -(Peer Reviewed Journal)
    Miller, M.E., Shishkoff, N., Cubeta, M.A. 2018. Thermal sensitivity of Calonectria henricotiae and Calonectria pseudonaviculata conidia and microsclerotia. Mycologia. 110:546-558. https://doi.org/10.1080/00275514.2018.1465778.
    
  • Downy mildew: a serious disease threat to rose health worldwide -(Review Article)
    Salgado-Salazar, C., Shishkoff, N., Daughtrey, M.L., Palmer, C., Crouch, J. 2018. Downy mildew: a serious disease threat to rose health worldwide. Plant Disease. https://doi.org/10.1094/PDIS-12-17-1968-FE.
    
  • Susceptibility of boxwood accessions from the National Boxwood Collection to Boxwood Blight and potential for differences between Calonectria pseudonaviculata and C. henricotiae -(Peer Reviewed Journal)
    Lamondia, J.A., Shishkoff, N. 2017. Susceptibility of boxwood accessions from the National Boxwood Collection to Boxwood Blight and potential for differences between Calonectria pseudonaviculata and C. henricotiae. Horticultural Science. 52(6):873–879.
    
  • Survival of Calonectria pseudonaviculata in leaves, twigs, and discrete microsclerotia in sand at two moisture levels and five temperatures -(Peer Reviewed Journal)
    Shishkoff, N. 2016. Survival of Calonectria pseudonaviculata in leaves, twigs, and discrete microsclerotia in sand at two moisture levels and five temperatures. Plant Disease. 100:2018-2024. https://doi.org/10.1094/PDIS-09-15-1098-RE.
    
  • Survival of microsclerotia of Calonectria pseudonaviculata and C. henricotiae exposed to sanitizers -(Peer Reviewed Journal)
    Shishkoff, N. 2016. Survival of microsclerotia of Calonectria pseudonaviculata and C. henricotiae exposed to sanitizers. Plant Health Progress. 17:13-17. doi:10.1094/PHP-RS-15-0038.
    
  • Pyracantha ‘Mohave’ fruit infection by Phytophthora ramorum and transmission of the pathogen from infected fruit to roots of Viburnum tinus -(Peer Reviewed Journal)
    Tooley, P.W., Browning, M.E., Shishkoff, N. 2016. Pyracantha ‘Mohave’ fruit infection by Phytophthora ramorum and transmission of the pathogen from infected fruit to roots of Viburnum tinus. Plant Disease. 100:555-560.
    
  • Evaluating boxwood (Buxus spp.) susceptibility to Calonectria pseudonaviculata by inoculating cuttings from the National Boxwood Collection at the U.S. National Arboretum-(Peer Reviewed Journal)
    Shishkoff, N., Daughtrey, M.L., Olsen, R.T., Aker, S.M. 2015. Evaluating boxwood (Buxus spp.) susceptibility to Calonectria pseudonaviculata by inoculating cuttings from the National Boxwood Collection at the U.S. National Arboretum. Plant Health Progress. 16:11-15.
    
  • Effect of growth-inhibiting compounds on recovery of Phytophthora ramorum from infected foliage over time, on root colonization and production of inoculum from plant roots-(Peer Reviewed Journal)
    Shishkoff, N. 2014. Effect of growth-inhibiting compounds on recovery of Phytophthora ramorum from infected foliage over time, on root colonization and production of inoculum from plant roots. Plant Health Progress. 15:36.
    
  • Boxwood Blight: A new scourge, a new paradigm for collaborative research-(Review Article)
    Palmer, C., Shishkoff, N. 2014. Boxwood Blight: A new scourge, a new paradigm for collaborative research. Outlooks on Pest Management. 25:230-236.
    
  • Root susceptibility and inoculum production from roots of Eastern United States oak species to Phytophthora ramorum-(Peer Reviewed Journal)
    Widmer, T.L., Shishkoff, N., Dodge, S.C. 2012. Root susceptibility and inoculum production from roots of Eastern United States oak species to Phytophthora ramorum. Plant Disease. 96:1675-1682.
    
  • Susceptibility of some common container weeds to Phytophthora ramorum-(Peer Reviewed Journal)
    
    
  • Root susceptibility and inoculum production from roots of eastern oak species to Phytophthora ramorum-(Abstract Only)
    Widmer, T.L., Shishkoff, N., Dodge, S.C. 2010. Root susceptibility and inoculum production from roots of eastern oak species to Phytophthora ramorum. Phytopathology. 100/S136.
    
  • Adaptation of a Phytophthora ramorum Real-Time Polymerase Chain Reaction Assay based on a mitochondrial gene region for use on the Cepheid SmartCycler-(Peer Reviewed Journal)
    Sechler, K.E., Carras, M.M., Shishkoff, N., Tooley, P.W. 2010. Adaptation of a Phytophthora ramorum Real-Time Polymerase Chain Reaction Assay based on a mitochondrial gene region for use on the Cepheid SmartCycler. Plant Health Progress. 2010 - 0212-01-RS.
    
  • A test system to quantify inoculum in runoff from Phytophthora ramorum-infected plant roots -(Abstract Only)
    
    
  • Standardizing the Nomenclature for Clonal Lineages of the Sudden Oak Death Pathogen, Phytophthora ramorum-(Peer Reviewed Journal)
    Grunwald, N.J., Goss, E.M., Ivors, K., Garbelotto, M., Martin, F.N., Prospero, S., Hansen, E., Bonants, P., Hamelin, R., Chastagner, G., Werres, S., Rizzo, D.M., Abad, G., Beales, P., Bilodeau, G.J., Blomquist, C., Brasier, C., Briere, S., Chandelier, A., Davidson, J.M., Denman, S., Elliott, M., Fichtner, E.J., Frankel, S.J., Goheen, E.M., De Gruyter, H., Heungens, K., James, D., Kanaskie, A., Mcwilliams, M., Moralejo, E., Osterbauer, N.K., Palm, M.E., Parke, J.L., Shamoun, S.F., Shishkoff, N., Tooley, P.W., Vettraino, A., Webber, J., Widmer, T.L. 2009. Standardizing the nomenclature for clonal lineages of the sudden oak death pathogen, Phytophthora ramorum. Phytopathology. 99:792-795.
    
  • Propagule production by Phytophthora ramorum on infected leaves of lilac (Syringa vulgaris)-(Peer Reviewed Journal)
    Shishkoff, N. 2009. Propagule production by Phytophthora ramorum on infected leaves of lilac (Syringa vulgaris). Plant Disease. 93:475-480.
    
  • Recovery Plan for Phytophthora kernoviae Causing Bleeding Trunk Cankers, Leaf Blight and Stem Dieback in Trees and Shrubs-(Government Publication)
    Benson, M., Ivors, K., Koch, F., Fichtner, E., Garbelotto, M., Rizzo, D., Tjosvold, S., Hansen, E., Parke, J., Hong, C., Chastagner, G., Jeffers, S., Woodward-Williams, J., Kim, S., Britton, K., Denitto, G., Frankel, S., Micales, J., Grunwald, N.J., Martin, F.N., Shishkoff, N., Smith, K.L., Tooley, P.W., Widmer, T.L., Bulluck, R., Burnett, G., Ferguson, L., Fowler, G., Garrett, L., Jones, J., Magarey, R., Randall-Schadel, B., Cardwell, K., Draper, M., Chand-Goyal, T. 2009. Recovery Plan for Phytophthora kernoviae Causing Bleeding Trunk Cankers, Leaf Blight and Stem Dieback in Trees and Shrubs. Government Publication/Report. Available at: http://www.ars.usda.gov/SP2UserFiles/Place/00000000/opmp/P.%20kernoviae%2081100.pdf
    
  • Sporulation on plant roots by Phytophthora ramorum-(Abstract Only)
    Shishkoff, N. 2008. Sporulation on plant roots by Phytophthora ramorum. Phytopathology. 98:S145
    
  • Development and Validation of a Tissue based Panel for the P. ramorum Proficiency Testing Program-(Abstract Only)
    Mavrodieva, V., Negi, S., Picton, D., Levy, L., Tooley, P.W., Shishkoff, N., Luster, D.G. 2008. Development and Validation of a Tissue based Panel for the P. ramorum Proficiency Testing Program. Phytopathology. 98:S100
    
  • Environmental parameters affecting inoculum production from lilac leaf pieces infected with Phytophthora ramorum -(Proceedings)
    Shishkoff, N. 2008. Environmental parameters affecting inoculum production from lilac leaf pieces infected with Phytophthora ramorum. Phytopathology. 96:S107 . Sudden Oak Death Science Symposium.
    
  • Susceptibility of some lilac cultivars and other members of the Oleaceae to Phytophthora ramorum-(Peer Reviewed Journal)
    Shishkoff, N. 2007. Susceptibility of some lilac cultivars and other members of the Oleaceae to Phytophthora ramorum. Plant Health Progress. 10.1094/PHP-2007-1101-2-RS
    
  • Sudden Oak Death (Phytophthora ramorum) and lilacs-(Other)
    Shishkoff, N. 2007. Sudden Oak Death (Phytophthora ramorum) and lilacs. Lilacs- Quarterly Journal of the Iternational Lilac Society. Fall 2007 Edition.
    
  • PERSISTENCE OF PHYTOPHTHORA RAMORUM IN SOIL MIX AND ROOTS OF NURSERY ORNAMENTALS-(Peer Reviewed Journal)
    Shishkoff, N. 2007. Persistence of phytophthora ramorum in soil mix and roots of nursery ornamentals. Plant Disease. 91:1245-1249
    
  • Identification of powdery mildew fungi anno 2006-(Peer Reviewed Journal)
    Heffer, V., Powelson, M., Johnson, K., Shishkoff, N. 2006. Identification of powdery mildew fungi anno 2006. The Plant Health Instructor DOI:1094/PHI-I-2006-0706-01.
    
  • DENSITY OF PHYTOPHTHORA RAMORUM CHLAMYDOSPORES IN SOIL NECESSARY TO CAUSE INFECTION-(Abstract Only)
    Colburn, G.C., Shishkoff, N. 2006. Density of phytophthora ramorum chlamydospores in soil necessary to cause infection. Phytopathology: 96:S25
    
  • Behavior of lilac leaves infected with Phytophthora ramorum when placed on the surface of nursery pots-(Abstract Only)
    Shishkoff, N. 2006. Behavior of lilac leaves infected with Phytophthora ramorum when placed on the surface of nursery pots. Phytopathology. 96:S107.
    
  • DIRECT OBSERVATION OF INFECTION OF VIBURNUM ROOTS BY P. RAMORUM USING A PETRI DISH RHIZOTRON-(Abstract Only)
    
    
  • SUSCEPTIBILITY OF CAMELLIA TO PHYTOPHTHORA RAMORUM, THE "SUDDEN OAK DEATH" ORGANISM-(Peer Reviewed Journal)
    Shishkoff, N. 2006. Susceptibility of camellia to phytophthora ramorum, the "sudden oak death" organism. Plant Health Progress. DOI=10.1094/PHP-2006-03S-01-RS
    
  • SURVIVABILITY AND PATHOGENICITY OF PHYTOPHTHORA RAMORUM CHLAMYDOSPORES IN SOIL-(Abstract Only)
    Colburn, G.C., Sechler, K.E., Shishkoff, N. 2005. Survivability and pathogenicity of Phytophthora ramorum chlamydospores in soil [abstract]. Phytopathology. 95:S20.
    
  • THE EFFECT OF SYSTEMIC FUNGICIDES ON DETECTION BY CULTURING OF PHYTOPHTHORA RAMORUM-(Abstract Only)
    Shishkoff, N. 2005. The effect of systemic fungicides on detection by culturing of Phytophthora ramorum [abstract]. Phytopathology. 95:S96.
    
  • SUSCEPTIBILITY TO PHYTOPHTHORA RAMORUM OF ROOTS AND SHOOTS OF COMMON CONTAINER WEEDS-(Abstract Only)
    Shishkoff, N., Senesac, A.F. 2005. Susceptibility to Phytophthora ramorum of roots and shoots of common container weeds [abstract]. Phytopathology. 95:S96.
    
  • SUSCEPTIBILITY OF SELECTED LILAC (SYRINGA L.) CULTIVARS TO PHYTOPHTHORA RAMORUM, THE SUDDEN OAK DEATH PATHOGEN-(Abstract Only)
    Shishkoff, N. 2006. Susceptibility of selected lilacs (syringa L.) cultivars to Phytophthora Ramorum, the sudden oak death pathogen. Phytopathology 95:S160.
    
  • WHAT'S NEW IN IPM FOR AZALEAS?-(Trade Journal)
    The Azalean 26:64-66
    
  • SUSCEPTIBILITY OF CAMELLIA TO PHYTOPHTHORA RAMORUM, THE SUDDEN OAK DEATH PATHOGEN-(Abstract Only)
    Shishkoff, N. 2005. Susceptibility of Camellia to Phytophthora ramorum, the sudden oak death pathogen [abstract]. Phytopathology. 95:S157.
    
  • PERSISTENCE OF PHYTOPHTHORA RAMORUM IN NURSERY PLANTS AND SOIL-(Abstract Only)
    Shishkoff, N., Tooley, P.W. 2004. Persistence of Phytophthora ramorum in nursery plants and soil. Phytopathology. 94:S95. Publication no. P-2004-0649-AMA.
    
  • FIRST REPORT OF POWDERY MILDEW, CAUSED BY ERYSIPHE VIBURNI, ON VIBURNUM TINUS IN CALIFORNIA-(Research Notes)
    Plant Disease 88:425
    

Education

Ph.D. in Mycology, Cornell University
B.S. in Botany, University of Michigan

Research Experience

• Lead Scientist and Research Plant Pathologist, USDA-ARS, Foreign Disease/Weed Science Research Unit, Frederick, MD, 2020-present.
• Research Plant Pathologist, USDA-ARS, Foreign Disease/Weed Science Research Unit, Frederick, MD, 2003-2020.
• Senior Research Associate, Cornell University, 1994-2003.

Honors and Awards

• USDA National Institute for Food and Agriculture (NIFA), Partnership Award for Program Improvement Through Global Engagement Category (team collaborator), 2022.
• Distinguished Service Award, American Phytopathological Society, Potomac Division, 2016.
• National Science Foundation graduate scholarship, 1981-1984.

ARS News Articles

• ARS News Articles

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Rose downy mildew disease.

Left to right: Mini roses grown in the greenhouse, Outdoor micro-plot of roses, and Peronospora sparsa, causal agent of rose downy mildew, growing on surface of a rose leaf. For more information about rose downy mildew, read this recent review paper here.