Research and Extension Area: Develop applied diagnostic and control programs for plant diseases of tree fruits, nuts, berries, grapes, ornamentals/nursery, Christmas trees and turf.
- Many fungal and bacterial diseases are a constant problem for fruit and ornamental/nursery production in Oregon. Pathogen biology and life histories are studied in the field and lab to improve disease control recommendations. Screening biologicals, pesticides, or cultural practices effective against these organisms is an ongoing need valuable to Oregon's growers. Information is delivered to clientele using the latest techniques and technologies including satellite systems and the World Wide Web.
Research Group Members
Faculty Research Assistants/Associates
BOT 553 Plant Disease Diagnosis
Pacific Northwest Plant Disease Management Handbook
The Eastern Filbert Blight Homepage
Fruit and Ornamental Disease Management Testing Program
Phytophthora Online Course:Training for Nursery Growers
Pscheidt, J.W. and Ocamb, C. M. Senior editors. 2018. Pacific Northwest Plant Disease Management Handbook. Oregon State Extension Service. 848 pp.
Pscheidt, J. W., Heckert, S. and Cluskey, S. A. 2018. Tank Mixing Fungicides for Effectiveness Against Eastern Filbert Blight of Hazelnut. Plant Disease, 102:919-924.
Pscheidt, J.W. and Rodriguez, T. G. 2018. Diseases of Rose. Pages 713-742 in McGovern, R. J. and Elmer, W. H. editors. Handbook of Florists’ Crops Diseases. Springer International Publishing. DOI 10.1007/978-3-319-39670-5_23
Lutes, L. A. and Pscheidt, J.W. 2017. First report of Cherry leaf roll virus on sweet cherry in Oregon. Plant Disease 102:691.
Pscheidt, J.W., Heckert, S. and Cluskey, S.A. 2017. Evaluation of Quinone Outside and Succinate Dehydrogenase Inhibitors for Effectiveness Against Eastern Filbert Blight of Hazelnut. Plant Disease 101:1868-1873.
Florence, J. and Pscheidt, J.W. 2017. Monilinia vaccinii-corymbosi Apothecial Development Associated With Mulch Depth and Timing of Application. Plant Disease 101:807-814.
Harteveld, D.O., Grant, M.R., Pscheidt, J.W. and Peever, T.L. 2017. Predicting Ascospore Release of Monilinia vaccinii-corymbosi of Blueberry with Machine Learning. Phytopathology 107:1364-1371. (See error data on xxxx)
Bouska, C. and Pscheidt, J.W. 2016. Beware of Boxwood Blight. EM 9141.
Heckert, S., Pscheidt, J. W., and Cluskey, S. A. 2016. Evaluation of Chipped Cankers for Management of Eastern Filbert Blight. Plant Health Prog. doi:10.1094/PHP-RS-16-0037.
Florence, J. and Pscheidt, J. W. 2016. Overwintering stages of pseudosclerotia development for Monilinia vaccinii-corymbosi, causal agent of mummy berry disease on highbush blueberry in North America. Plant Health Progress doi:10.1094/PHP-BR-16-0003.
Mattox, C.M., Kowalewski, A.R., McDonald, B.W., Lambrinos, J.G., Daviscourt, B.L. and Pscheidt, J.W. 2016. Nitrogen and Iron Sulfate Affect Microdochium Patch Severity and Turf Quality on Annual Bluegrass Putting Greens. Crop Science 57:1-8.
Pscheidt, J.W. 2016. Bacterial Canker. in Caruso, F. L. editors. Compendium of Blueberry, Cranberry, and Lingonberry Diseases and Pests. 2nd Edition. APS Press, St. Paul, MN.
Hadziabdic D, Wadl PA, Staton ME, Klingeman WE, Moulton JK, Pscheidt JW, Wiggins GJ, Grant JF, Lambdin PL, Windham MT, Faccoli M, Merten PR, Trigiano RN. 2015. Development of microsatellite loci in Pityophthorus juglandis, a vector of thousand cankers disease in Juglans spp. Conserv. Genet. Resour. 7(2):431-433. DOI: 10.1007/s12686-014-0388-0.
Wilcox, W. F., Ellis, M. A., Rawnsley, B., Rossman, A., and Pscheidt, J.W. 2015. Phomopsis Cane and Leaf Spot. in Wilcox, W. F., Gubler, W. D. and Uyemoto, J. K.. editors. Compendium of Grape Diseases, Disorders and Pests. 2nd Edition. APS Press, St. Paul, MN. 232pp.
Pscheidt, J.W., Stoven, H., Castagnoli, S. and Renquist, S. Revised April 2015. Managing diseases and insects in home orchards. Oregon State University Extension Service. EC 631. (also Revised 2007 and 2010.)
Florence, J. and Pscheidt, J.W. 2015. Mummy Berry Management in the Pacific Northwest. EM 9117.
Zerillo MM, Caballero IJ, Woeste K, Graves AD, Hartel C, Pscheidt JW, Tonos J., Broders K., Cranshaw W., Seybold SJ, and Tisserat, N. 2014. Population Structure of Geosmithia morbida, the Causal Agent of Thousand Cankers Disease of Walnut Trees in the United States. PLoS ONE 9(11): e112847. doi:10.1371/journal.pone.0112847
Newcombe, G. and Pscheidt, J.W. 2014. Rusts. in Benson, M. and Linderman, R. editors. Compendium of Rhododendron and Azalea Diseases and Pests. 2nd Edition. APS Press, St. Paul, MN. 136pp.
Pscheidt, J. W., and Harper, N. 2014. Progression of symptoms on blueberry infected with Blueberry shock virus. Plant Health Progress doi:10.1094/PHP-RS-13-0121.
Heckert, S., Pscheidt, J.W., and Cluskey, S.A. 2014. Disease incidence and ascospore dispersal from cut hazelnut branches colonized by Anisogramma anomala. Plant Disease 98:834-838.
Hadziabdic, D., Vito, L. M., Windham, M. T., Pscheidt, J.W., Trigiano, R.N. and Kolarik, M. 2014. Genetic differentiation and spatial structure of Geosmithia morbida, the causal agent of thousand cankers disease in black walnut (Juglans nigra). Current Genetics 60: 75-87. DOI 10.1007/s00294-013-0414-x.
Heckert, S., Pscheidt, J.W., and Stone, J.K. 2013. A quick and simple method to evaluate Anisogramma anomala Ascospore Viability. Online. Plant Health Progress. doi:10.1094/PHP-2013-0509-09-RS.
Moyer, M., Grove, G. and Pscheidt, J.W. 2013. Botrytis Bunch Rot. In Moyer, M.M. and O’Neal, S.D. 2013. Field Guide for Integrated Pest Management in Pacific Northwest Vineyards. PNW 644.
Moyer, M., Grove, G. and Pscheidt, J.W. 2013. Powdery Mildew. In Moyer, M.M. and O’Neal, S.D. 2013. Field Guide for Integrated Pest Management in Pacific Northwest Vineyards. PNW 644.
Grove, G. and Pscheidt, J.W. 2013. Fungicide Resistance Management. In Moyer, M.M. and O’Neal, S.D. 2013. Field Guide for Integrated Pest Management in Pacific Northwest Vineyards. PNW 644.
Tisserat, N., Cranshaw, W., Putnam, M. L., Pscheidt, J., Leslie, C. A., Murray, M., Hoffman, J., Barkley, Y., Alexander, K., and Seybold, S. J. 2011. Thousand cankers disease is widespread in black walnut in the western United States. Online. Plant Health Progress doi:10.1094/PHP-2011-0630-01-BR.