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Philip B. HammExtension Plant Pathologist & Superintendent, Hermiston Agricultural Reserach and Extension Center &
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Identification and control of diseases impacting vegetable crops; diseases caused by Phytophthora sp.; Potato diseases.
Virus, nematodes and fungal pathogens are responsible for extensive losses in the vegetable growing region of the Columbia Basin in northeast Oregon. My research is centered around the identification of the specific pathogens and then their control through cultural manipulation and/or through chemical and biotechnical methods.
Nick David
Stacy Gieck
Program Manager: Philip Hamm
Laboratory Manager: Stacy Gieck
The plant clinic in Hermiston provides free disease diagnosis and recommendations for disease prevention and control to county extension agents, growers, agricultural consultants, agricultural companies, and home owners in North central & Northeast Oregon and elsewhere. The clinic also provides a fee testing service for many virus diseases and soilborne fungi. Call for details: 541-567-8321.
http://oregonstate.edu/Dept/hermiston/PhilHamm.php
Clough, G.H. and P.B. Hamm. 1995. Coat Protein transgenic resistance to watermelon mosaic and zucchini yellows mosaic virus in squash and zucchini. Plant Dis. 79: 1107-1109.
Miller, J.S., P.B. Hamm and D.A. Johnson. 1997. Characterization of the Phytophthora infestans population in the Columbia Basin of Oregon and Washington from 1992-1995. Phytopathology 87: 656-660
Hane, D.C. and P.B. Hamm. 1999. The effects of seedborne pvy infection in two potato cultivars expressing mild disease symptoms.Plant Dis. 83:43-45.
Hamm, P.B. and G.H. Clough. 1999. Comparison of application methods on deposition and redistribution of chlorothalonil in a potato canopy and potential impact for control. Plant Dis. 83:441-444.
Geary, G., D. A. Johnson, P. B. Hamm, and T. F. Cummings. 1999. Fungicide application for late blight management: A boom attached to a center pivot irrigation system. Plant Dis. 83:512-515.
Hamm, P. B. and D. C. Hane. 1999. Effects of seedborne Potato Leafroll Virus on Russet Norkotah potato. Plant Disease 83: 1122-1124.
Brown, C. R., H. Mojtahedi, G. S. Santo, P. B. Hamm, J. J. Pavek, D. Corsini, S. Love, J. Crosslin, and P.E. Thomas. 2000. Potato Germplasm resistant to Corky Ringspot disease. American J. of Potato Res 77:23-27.
Ingham, R. E., P. B. Hamm, J. P. McMorran, and G. H. Clough. 2000. Occurrence and Management of Paratrichodorus allius. Supplement to the Journal of Nematology: 31:678-683.
Johnson, D. A., T.F. Cummings, and P.B. Hamm. 2000. Cost of Management of potato late blight in the Columbia Basin: 1996-1998. Plant Disease 84: 399-402.
Gavino, P. D., C. D. Smart, R. W. Sandrock, J. S. Miller, P. B. Hamm, T. Yun Lee, R. M. Davis, and W. E. Fry. 2000. Implications of sexual reproduction for Phytophthora infestans in the United States: generation of an aggressive lineage. Plant Disease 84: (731-735).
Geary, G., P.B. Hamm, and D.A. Johnson. 2004. Application and distribution of fungicides using differing water rates and surfactants for the control of late blight in commercial potato fields. American Journal of Potato Res 81:305-315
Crosslin, J. M. J. E. Munyaneza, A. Jensen, and P. B. Hamm. 2005. Association of the beet leafhopper (Homoptera:Cicadellidae) with a clover proliferation group phytoplasma in the Columbia Basin of Washington and Oregon . J. Econ Ent 98:279-283.
Collins, H.P., A. Alva, R.A. Boydston, R.L. Cochran, P.B. Hamm, A. McGuire and E. Riga. 2005. Soil Microbial, Fungal and Nematode Responses to Soil Fumigation and Cover Crops under Potato Production. Biol Fertil Soils. Online publication. DOI: 10.1007/s00374-005-0022-0.
Crosslin, J.M., P.B. Hamm, P.J. Shiel , D.C. Hane, C.R. Brown, and P.H. Berger. 2005. Serological and molecular detection of tobacco veinal necrosis isolates of Potato virus Y (PVY) from potatoes grown in the western United States . Amer. J. Pot. Res. 82:263-269.
Ingham, R.E., P.B. Hamm, E. Riga and K.J. Merrifield. 2005. First report of Pratylenchus penetrans damage to ranger russet potato in the Columbia Basin of Washington. Plant Disease. 89:207
Lorensen, J., P. Shield, P. Berger, J.M. Crosslin, & P.B. Hamm. 2006. Whole genome characterization of Potato Virus Y isolates collected in the western USA and their comparison to isolates from Europe and Canada . Archives of Virology 151: 1055–1074
Crosslin, J.M. , P.B. Hamm, D . Hane, J. Jaeger, C.R. Brown, P.J. Shiel, P. H. Berger, and R.E. Thornton. 2006. The occurrence of PVY o and PVY n strains in potato seed lots planted in Oregon and Washington . Plant D isease 90:1102-1105.
Hamm , P.B., D. A. Johnson and T. Cummings. 2006. The alternate use of air and chemigation application methods for applying fungicides for the control of late blight in potato. Am. J. Potato Res. 83: 473-484.
Geary, B., D . A. Johnson, P. B. Hamm, S. James, and K . A. Rykbost. 2007. Management of potato silver scurf with the use of chemicals and identification of thiabendazole and thiophanate-methyl resistant isolates of Helminthosporium solani . Plant D isease 91:315-320.
Ocamb, C. M., P. B. Hamm, and D . A. Johnson. 2007. Fusarium species recovered from potato dry rot in the Columbia Basin of Oregon and Washington: thiabendazole tolerance and ability to decay tubers. Am J. Potato Res. 84:169178
Gieck, S .L., H. R. Pappu, P. B. Hamm and N. L. David. 2007. First Report of Onion Yellow Dwarf Virus, Leek Yellow Stripe Virus, and Garlic Common Latent Virus in Garlic in Oregon . Plant D isease 91:461
