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United States Department of Agriculture

Agricultural Research Service

Research Project: EXOTIC, EMERGING, RE-EMERGING, AND INVASIVE PLANT DISEASES OF HORTICULTURAL CROPS

Location: Horticultural Crops Research

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)

Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance - (Peer Reviewed Journal)
Morin, L., Gomez, D., Evans, K., Neill, T.M., Mahaffee, W.F., Linde, C. 2013. Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance. Biological Invasions. 15(8):1847-1861.
Emergence of the sudden oak death pathogen Phytophthora ramorum - (Review Article)
Grunwald, N.J., Garbelotto, M., Goss, E.M., Heungens, K., Prospero, S. 2012. Emergence of the sudden oak death pathogen Phytophthora ramorum. Trends in Microbiology. 20:131-138.
The plant pathogen Phytophthora andina emerged via hybridization of an unknown Phytophthora species and the Irish famine pathogen, P. infestans - (Peer Reviewed Journal)
Goss, E.M., Cardenas, M.E., Myers, K., Forbes, G.A., Fry, W.E., Restrepo, S.O., Grunwald, N.J. 2011. The plant pathogen Phytophthora andina emerged via hybridization of an unknown Phytophthora species and the Irish famine pathogen, P. infestans. PLoS One. 69(9):e24543.
Phytophthora ramorum: How it got here and how it spread - (Trade Journal)
Grunwald, N.J. 2011. Phytophthora ramorum: How it got here and how it spread. Digger. 9:41-45.
Defining species boundaries in the genus Phytophthora: the case of Phytophthora andina. A response to “Phytophthora andina sp. nov., a newly identified heterothallic pathogen of solanaceous hosts in the Andean highlands - (Peer Reviewed Journal)
Cardenas, M.E., Tabima, J., Fry, W.E., Grunwald, N.J., Bernal, A.J., Restrepo, S.O. 2012. Defining species boundaries in the genus Phytophthora: the case of Phytophthora andina. A response to “Phytophthora andina sp. nov., a newly identified heterothallic pathogen of solanaceous hosts in the Andean highlands." Plant Pathology. 61(2):215-220.
Safe Procurement and Production Manual: A Systems Approach for the Production of Healthy Nursery Stock - (Book / Chapter)
Griesbach, J.A., Parke, J.L., Chastagner, G.A., Grunwald, N.J., Aguirre, J. 2011. Safe Procurement and Production Manual: A Systems Approach for the Production of Healthy Nursery Stock. Wilsonville, OR. Oregon Association of Nurseries. 108 p.
A systems approach for management of pests and pathogens of nursery crops - (Review Article)
Parke, J.L., Grunwald, N.J. 2012. A systems approach for management of pests and pathogens of nursery crops. Plant Disease. 96(9):1236-1244.
Identification of new polymorphic microsatellite markers in the NA1 and NA2 lineages of Phytophthora ramorum - (Peer Reviewed Journal)
Vercauteren, A., Larsen, M.M., Goss, E.M., Grunwald, N.J., Maes, M., Heungens, K. 2011. Identification of new polymorphic microsatellite markers in the NA1 and NA2 lineages of Phytophthora ramorum. Mycologia. 103:1245-1249.
Inoculum detection for managing grape powdery mildew - (Popular Publication)
Mahaffee, W.F., Grove, G., Stoll, R. 2011. Inoculum detection for managing grape powdery mildew. Practical Winery and Vineyards. Spring. p. 26-32.
Subsurface examination of a foliar biofilm using scanning electron- and focused-ion-beam microscopy - (Peer Reviewed Journal)
Wallace, P., Arey, B., Mahaffee, W.F. 2011. Subsurface examination of a foliar biofilm using scanning electron- and focused-ion-beam microscopy. Micron. 42:579-585.
Genetic diversity of Phytophthora infestans in the Northern-Andean region - (Peer Reviewed Journal)
Cardenas, M., Grajales, A., Sierra, R., Rojas, A., Garavito, M., Lozano, G., Gonzalez-Almario, A., Vargas, A., Marin, M., Fermin, G., Lagos, L.E., Grunwald, N.J., Bernal, A., Salazar, C., Restrepo, S. 2011. Genetic diversity of Phytophthora infestans in the Northern-Andean region. BMC Evolutionary Biology. 12:23.
Evolution and population genetics of exotic and re-emerging pathogens: Novel tools and approaches - (Review Article)
Grunwald, N.J., Goss, E.M. 2011. Evolution and population genetics of exotic and re-emerging pathogens: Novel tools and approaches. Annual Review of Phytopathology. 49:249-267.
Introduction to Oomycetes - (Review Article)
Fry, W.E., Grunwald, N.J. 2010. Introduction to Oomycetes. The Plant Health Instructor. DOI:10.1094/PHI-I-2010-1207-01. Available: http://www.apsnet.org/edcenter/intropp/PathogenGroups/Pages/IntroOomycetes.aspx
Phytophthora ramorum detections in Canada: evidence for migration within North America and from Europe - (Peer Reviewed Journal)
Goss, E.M., Larsen, M.M., Vercauteren, A., Werres, S., Heungens, K., Grunwald, N.J. 2011. Phytophthora ramorum detections in Canada: evidence for migration within North America and from Europe. Phytopathology. 101:166-171.
Quantitative resistance to late blight from Solanum berthaultii cosegregates with RPi-ber: insights in stability through isolates and environment - (Peer Reviewed Journal)
Rauscher, G., Simko, I., Mayton, H., Bonierbale, M., Smart, C.D., Grunwald, N.J., Greenland, A., Fry, W.E. 2010. Quantitative resistance to late blight from Solanum berthaultii cosegregates with RPi-ber: insights in stability through isolates and environment. Theoretical and Applied Genetics. 121:1553-1567.
The impact of canopy geometry on particle dispersion gradients in sparse agricultural canopies - (Proceedings)
Bailey, B., Stoll, R., Mahaffee, W.F., Pardyjak, E. 2010. The impact of canopy geometry on particle dispersion gradients in sparse agricultural canopies. Agricultural and Forest Meteorology Conference Proceedings. Available: http://ams.confex.com/ams/19Ag19BLT9Urban/techprogram/MEETING.HTM.
The Promise and Pitfalls of Sequence-Based Identification of Plant Pathogenic Fungi and Oomycetes. - (Peer Reviewed Journal)
Kang, S., Mansfield, M., Park, B., Geiser, D., Coffey, M., Grunwald, N.J. 2010. The promise and pitfalls of sequence-based identification of plant pathogenic fungi and oomycetes. Phytopathology. 100: 732-737.
Permanent Genetic Resources added to Molecular Ecology Resources Database 1 December 2009–31 January 2010 - (Peer Reviewed Journal)
C., Gomez, D., Morin, L., Evans, K., Mahaffee, W.F., Neill, T.M., Grunwald, N.J.,Molecular Ecology Resources Primer Development Consortium. 2010. Permanent genetic resources added to molecular ecology resources database 1 December 2009–31 January 2010. Molecular Ecology Resources. 10:576-579.
Development of 11 polymorphic microsatellite markers for the blackberry rust fungus Phragmidium violaceum - (Peer Reviewed Journal)
Gomez, D., Morin, L., Evans, K., Mahaffee, W.F., Neill, T.M., Grunwald, N.J. 2010. Development of 11 polymorphic microsatellite markers for the blackberry rust fungus Phragmidium violaceum. Molecular Ecology Resources. 10:576-579.
Factors Influencing Epidemiology and Management of Blackberry Rust in Cultivated Rubus laciniatus - (Peer Reviewed Journal)
Johnson, K., Mahaffee, W.F. 2010. Factors influencing epidemiology and management of blackberry rust in cultivated Rubus laciniatus. Plant Disease. 94:581-588.
Clonal Expansion of the Belgian Phytophthora ramorum Populations Based on New Microsatellite Markers - (Peer Reviewed Journal)
Vercauteren, A., De Dobbelaere, I., Grunwald, N.J., Bonants, P., Van Bockstaele, E., Maes, M., Heungens, K. 2009. Clonal expansion of the Belgian Phytophthora ramorum populations based on new microsatellite markers. Molecular Ecology. 19:92-107.
Phenotypic differences among three clonal lineages of Phytophthora ramorum - (Peer Reviewed Journal)
Elliot, M., Sumampong, G., Varga, A., Shamoun, S.F., James, D., Masri, S., Grunwald, N.J. 2011. Phenotypic differences among three clonal lineages of Phytophthora ramorum. Forest Pathology. 41:7-14.
Population Genetic Analysis Infers Migration Pathways of Phytophthora ramorum in U.S. Nurseries - (Peer Reviewed Journal)
Goss, E.M., Larsen, M.M., Chastagner, G., Givens, D., Grunwald, N.J. 2009. Population genetic analysis infers migration pathways of Phytophthora ramorum in U.S. nurseries. PLoS Pathogens. 5(9):e1000538.
Foliar biofilms of Burkholderia pyrrocinia FP62 on geraniums - (Abstract Only)
Wallace, P., Mahaffee, W.F., Neill, T.M. 2009. Foliar biofilms of Burkholderia pyrrocinia FP62 on geraniums. American Phytopathological Society Abstracts. p. 568.
Forecast and virtual weather driven plant disease risk modeling system - (Abstract Only)
Coop, L., Fox, A., Mahaffee, W.F., Gent, D.H., Pfender, W.F., Thomas, C. 2009. Forecast and virtual weather driven plant disease risk modeling system. American Phytopathological Society Abstracts. p. 873.
The relationship of biofilm production to biocontrol activity of Burkholderia pyrrocinia FP62 - (Abstract Only)
Wallace, P., Mahaffee, W.F., Press, C.M., Larsen, M.M., Neill, T.M. 2009. The relationship of biofilm production to biocontrol activity of Burkholderia pyrrocinia FP62. American Phytopathological Society Abstracts. p. 569.
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.
Migration Patterns of the Emerging Plant Pathogen Phytophthora ramorum on the West Coast of the United States of America - (Peer Reviewed Journal)
Prospero, S., Grunwald, N.J., Winton, L.M., Hansen, E.M. 2009. Migration patterns of the emerging plant pathogen Phytophthora ramorum on the west coast of the United States of America. Phytopathology. 99:739-749.
Effect of Temperature on the Sporulation and Infectivity of Podosphaera macularis on Humulus lupulus - (Peer Reviewed Journal)
Peetz, A., Mahaffee, W.F., Gent, D.H. 2009. Effect of temperature on the sporulation and infectivity of Podosphaera macularis on Humulus lupulus. Plant Disease. 93:281-286.
Evolution and Genetics of the Invasive Sudden Oak Death Pathogen Phytophthora ramorum - (Book / Chapter)
Grunwald, N.J., Goss, E.M. 2009. Evolution and genetics of the invasive sudden oak death pathogen Phytophthora ramorum. In: Lamour, K. and Kamoun, S. editors. Oomycete Genetics and Genomics: Diversity, Interactions, and Research Tools. Hoboken, NJ. John Wiley and Sons Inc. p.179-196.
Phytophthora sojae: Diversity among and within Populations - (Book / Chapter)
Dorrance, A., Grunwald, N.J. 2009. Phytophthora sojae: Diversity among and within populations. In: Lamour, K. and Kamoun S. editors. Oomycete Genetics and Genomics: Diversity, Interactions, and Research Tools. Hoboken, NJ. John Wiley and Sons Inc. p. 197-212.
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
Pcr-Rflp Markers Identify Three Lineages of the North American and European Populations of Phytophthora Ramorum - (Peer Reviewed Journal)
Elliott, M., Sumampong, G., Varga, A., Shamoun, S.F., James, D., Masri, S., Briere, S.C., Grunwald, N.J. 2009. PCR-RFLP markers identify threelineages of the North American and European populations of Phytophthora ramorum. Forest Pathology. 39:266-278.
Ancient Isolation and Independent Evolution of the Three Clonal Lineages of the Emerging Sudden Oak Death Pathogen Phytophthora ramorum - (Peer Reviewed Journal)
Goss, E.M., Carbone, I., Grunwald, N.J. 2009. Ancient isolation and independent evolution of the three clonal lineages of the emerging sudden oak death pathogen Phytophthora ramorum. Molecular Ecology. 18(6):1161-1174.
Tracing the Path of Pathogens: An Ongoing Study Evaluates the Systems Approach for Managing Phytophthora Diseases in Nurseries - (Popular Publication)
Parke, J., Grunwald, N.J., Lewis, C. 2009. Tracing the path of pathogens: an ongoing study evaluates the systems approach for managing Phytophthora diseases in nurseries. Digger. 12:43-51.
Population Structure, Races, and Host Range of Aphanomyces euteiches from Alfalfa Production Fields in the Central U.S.A. - (Peer Reviewed Journal)
Malvick, D.K., Grunwald, N.J., Dyer, A.T. 2009. Population structure, races, and host range of Aphanomyces euteiches from alfalfa production fields in the central U.S.A. European Journal of Plant Pathology. 123(2):171-182.
Comparison of Two Methods for Anthocyanin Quantification - (Proceedings)
Lee, J., Rennaker, C.D., Wrolstad, R.E. 2009. Comparison of two methods for anthocyanin quantification. Acta Horticulturae. 810:831-834.
Phytophthora ramorum: A Pathogen with a Remarkably Wide Host Range Causing Sudden Oak Death on Oaks and Ramorum Blight on Woody Ornamentals - (Peer Reviewed Journal)
Grunwald, N.J., Goss, E.M., Press, C.M. 2008. Phytophthora ramorum: A pathogen with a remarkably wide host range causing sudden oak death on oaks and ramorum blight on woody ornamentals. Molecular Plant Pathology. 9(6):729-740.
Powdery Mildew - (Book / Chapter)
Mahaffee, W.F., Englhard, B., Gent, D.H. 2009. Powdery mildew. In: Mahaffee, W.F., Pethybridge, S.J., and Gent, D.H. editors. Compendium of Hop Diseases and Pests. St. Paul, MN: APS Press. p. 25-31.
The Genus Humulus - (Book / Chapter)
Mahaffee, W.F., Pethybridge, S. 2009. The genus Humulus. In: Mahaffee, W.F., Pethybridge, S.J., and Gent, D.H. editors. Compendium of Hop Diseases and Pests. St. Paul, MN: APS Press. p. 1-5.
Gray Mold - (Book / Chapter)
Mahaffee, W.F., Englhard, B. 2009. Gray mold. In: Mahaffee, W.F., Pethybridge, S.J., and Gent, D.H. editors. Compendium of Hop Diseases and Pests. St. Paul, MN: APS Press. p. 24-25.
Compendium of Hop Diseases and Pests - (Book / Chapter)
Mahaffee, W.F., Pethybridge, S.J.,Gent, D.H. editors. 2009. Compendium of hop diseases and pests. St. Paul, MN: APS Press. 93 p.
Nutrient Imbalances - (Book / Chapter)
Mahaffee, W.F., Pethybridge, S., Gent, D.H. 2009. Nutrient imbalances. In: Mahaffee, W.F., Pethybridge, S.J., and Gent, D.H. editors. Compendium of Hop Diseases and Pests. St. Paul, MN: APS Press. p. 75-77.
Injuries Caused by Environmental Factors - (Book / Chapter)
Mahaffee, W.F., Pethybridge, S., Gent, D.H. 2009. Injuries caused by environmental factors. In: Mahaffee, W.F., Pethybridge, S.J., and Gent, D.H. editors. Compendium of Hop Diseases and Pests. St. Paul, MN: APS Press. p.77-78.
Chemical Injury - (Book / Chapter)
Gent, D.H., Pethybridge, S., Mahaffee, W.F. 2009. Chemical injury. In: Mahaffee, W.F., Pethybridge, S.J., and Gent, D.H. editors. Compendium of Hop Diseases and Pests. St. Paul, MN: APS Press. p. 78-80.
Cone Early Maturity - (Book / Chapter)
Mahaffee, W.F. 2009. Cone early maturity. In: Mahaffee, W.F., Pethybridge, S.J., and Gent, D.H. editors. Compendium of Hop Diseases and Pests. St. Paul, MN: APS Press. p. 73-74.
Field Temperature and Anthocyanins in Merlot Grape Berries - (Abstract Only)
Tarara, J.M., Lee, J., Spayd, S.E., Scagel, C.F. 2008. Field temperature and anthocyanins in Merlot grape berries. HortScience. 43(4):1233.
Trellis Tension Monitor for Continuous Growth and Yield Information - (Abstract Only)
Tarara, J.M., Blom, P.E. 2008. Trellis tension monitor for continuous growth and yield information. HortScience. 43(4):1129.
Field Temperature and Anthocyanins in Merlot Grape Berries - (Abstract Only)
Tarara, J.M., Lee, J., Spayd, S.E., Scagel, C.F. 2008. Field temperature and anthocyanins in Merlot grape berries. American Journal of Enology and Viticulture. 59:346 A.
First Report of the European Lineage of Phytophthora ramorum in a California Nursery - (Peer Reviewed Journal)
Grunwald, N.J., Goss, E.M., Larsen, M.M., Press, C.M., Mcdonald, V.T., Blomquist, C.L., Thomas, S.L. 2008. First report of the European lineage of Phytophthora ramorum in a California nursery. Plant Disease. 92:314.
Marker Stability throughout 400 Days of Hyphal Growth of Sclerotinia sclerotiorum - (Peer Reviewed Journal)
Kohn, L., Anderson, J.B., Schaffer, M.R., Grunwald, N.J. 2008. Marker stability throughout 400 Days of hyphal growth of Sclerotinia sclerotiorum. Fungal Genetics and Biology. 45:613-617.
Susceptibility in Viburnum to Phytophthora ramorum - (Peer Reviewed Journal)
Grunwald, N.J., Kitner, M., Mcdonald, V., Goss, E.M. 2008. Susceptibility in Viburnum to Phytophthora ramorum. Plant Disease. 92:210-214.
Population Structure of Phytophthora ramorum in Oregon - (Proceedings)
Prospero, S., Britt, J., Grunwald, N.J., Hansen, E.M. 2008. Population Structure of Phytophthora ramorum in Oregon. Proceedings of the Sudden Oak Death Science Symposium. p. 239-242.
New Populations of Sclerotinia sclerotiorum from Lettuce in California and Peas and Lentils in Washington - (Peer Reviewed Journal)
Malvarez, G., Carbone, I., Grunwald, N.J., Subbarao, K.V., Schafer, M., Kohn, L.M. 2007. New populations of Sclerotinia sclerotiorum from lettuce in California and peas and lentils in Washington. Phytopathology. 97(4): 470-483.
Last Modified: 10/1/2014
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