Tim Paulitz

Research Plant Pathologist

USDA-ARS, Wheat Health, Genetics and Quality Research Unit,
Pullman, WA

E-mail: timothy.paulitz@usda.gov
Phone: (509) 335-7077



  • University of California, Riverside, PhD in Plant Pathology 1984
  • California State Polytechnic University, Pomona, BS in Botany and Plant Pathology, 1979


  • 2000-present. GS 15.  USDA-ARS Wheat Health, Genetics, and Quality Research Unit, Pullman, WA.  Research Plant Pathologist.  Soilborne fungal and nematode diseases of wheat, barley, canola, legumes and other rotation crops. Epidemiology, ecology, detection and quantification of soilborne pathogens. Microbiome of wheat and rotation crops, soil health, soil microbiomes
  • 1989-2000 Dept. Plant Science, Macdonald Campus of McGill University, Ste. Anne de Bellevue, Quebec, Canada. Assistant and Associate Professor.  Plant pathology of cereal, fruit, vegetable crops and greenhouse crops.  Mycology, ecology, epidemiology.
  • 1987-1989. USDA-ARS Horticultural Research Laboratory, Postdoctoral Research Associate.  Biological control of fungal diseases with antagonistic bacteria and interactions with vesicular-arbuscular mycorrhizal fungi.
  • 1984-1987. Department of Plant Pathology and Weed Science, Colorado State University. Visiting assistant professor.  Biological control of greenhouse crops.

Relevant Professional Experience and Synergistic Activities

2007-2016        Editor-in-Chief, American Phytopathological Society Press

2009                 Fellow, American Phytopathological Society

2007-2012        Associate Editor-in-Chief, American Phytopathological Society Press

2004-2007        Senior Editor, American Phytopathological Society Press

2005-present   Collaborator with CIMMYT Global Initiative on Wheat Root Health in Rainfed System, teaching workshops in Turkey and hosting Turkish, Moroccan and Tunisian scientists.

2002-present    Member, secretary, and chair of W-3147 Biological Control of Soilborne Pathogens Multistate CSREES project

1999-2002        Member of U.S. Wheat and Barley Scab Initiative Review Panel

2001-present    Section Editor, Canadian Journal of Plant Pathology

1998-2002        Section Editor, Plant and Soil

1994-1997        Senior Editor, Phytopathology

1991-1994        Associate Editor, Phytopathology

From 1990-2000, I supervised to completion 18 MSc students, 4 PhD students, and 5 postdoctoral researchers.  From 2000-2016, as an adjunct professor in the Dept. of Plant Pathology at Washington State University, I have supervised or co-supervised 9 PhD and 3 MSc students.

Skills and Expertise

Plant pathology, mycology, nematology, soilborne pathogens of wheat, barley, canola, legumes. Soil microbiomes, soil health, wheat microbiome

Role in the CAF-LTAR

Soil microbiome, wheat health

Current Research Projects

Selected Products

PUBLICATIONS (More than 175 refereed publications over career, 17 book chapters and over 80 abstracts).  Refereed publications for the last 5 years are presented.

  • Gargouri, S., Berraies, S., Gharbi, M. S., Paulitz, T. Murray, T. D. and Burgess, L. W. 2017. Occurrence of sclerotinia stem rot of fenugreek caused by Sclerotinia trifoliorum and sclerotiorum in Tunisia. European Journal of Plant Pathology 149: 587-597.
  • Jaaffar, K.M., Parejko, J.A., Paulitz, T.C., Weller, D.M., Thomashow, L.S. 2017. Sensitivity of Rhizoctonia isolates from the Inland Pacific Northwest of the United States to phenazine-1-carboxylic acid and biological control by phenazine-producing Pseudomonas Phytopathology. 107: 692-703.
  • Paulitz, T. C., Knerr, A. J., Carmody, S. M., Schlatter, D., Sowers, K., Derie, M. L., du Toit, L. J. First report of Leptosphaeria maculans and Leptosphaeria biglobosa, causal agents of blackleg, on canola in Washington State.  Plant Disease 101: 504-505.
  • Poudyal-Sharma, D., Schlatter, D., Yin, C. T. Hulbert, S. and Paulitz, T. C. Long-term no-till: a major driver of fungal communities in dryland wheat cropping systems. PloS One 12: 10.1371/journal.pone.018611.
  • Schlatter, D. C., Yin, C., Hulbert, S. Burke, I. and Paulitz, T. Impacts of repeated glyphosate use on wheat-associated bacteria are small and depend on glyphosate use history.  Applied and Environmental Microbiology 83: DOI: 10.1128/AEM.01354-17.
  • Schlatter, D., Kinkel, L., Thomashow, L., Weller, D. and Paulitz, T. C. 2017. Disease suppressive soils: New insights from the soil microbiome. Phytopathology 107: 1284-1297.
  • Schlatter, D. C., Yin, C., Burke, I., Hulbert, S. and Paulitz, T. C. 2018. Location, root proximity, and glyphosate-use history modulate the effects of glyphosate on fungal community networks of wheat. Microbial Ecology https://doi.org/10.1007/s00248-017-1113-9.
  • Thompson, A.L., Mahoney, A.K., Smiley, R.W., Paulitz, T.C., Hulbert, S., Garland Campbell, K.A. 2017. Resistance to multiple soil-borne pathogens of the Pacific Northwest is collocated in a wheat recombinant inbred line population. G3, Genes/Genomes/Genetics. 7: 1109-1116.
  • Yin, C., Schlatter, D., Schroeder, K., Mueth, N., Prescott, A. Dhingra, A., Hulbert, S. and Paulitz, T. C. 2017. Bacterial communities on wheat grown under long-term conventional tillage and no-till in the Pacific Northwest of the US. Phytobiomes 1: 83-90.
  • Schlatter, D.C., Schillinger, W.F., Bary, A.I., Sharratt, B.S., Paulitz, T.C. 2017. Biosolids and conservation tillage: Impacts on soil fungal communities in dryland wheat-fallow cropping systems. Soil Biology and Biochemistry. 115:556-567.
  • Mahoney, A.K., Babiker, E.M., See, D.R., Paulitz, T.C., Okubara, P.A., Hulbert, S.H. 2017. Analysis and mapping of Rhizoctonia root rot resistance traits from the synthetic wheat (Triticum aestivum L.) line SYN-172. Molecular Breeding. https://doi 10.1007/s11032-017-0730-9.
  • Schillinger, W., Paulitz, T.C. 2018. Canola versus wheat rotation effects on subsequent wheat yield. Field Crops Research. 223:26-32.
  • Kandel, S. L, Smiley, R. W., Garland-Campbell, K., Elling, A. A. Huggins, D. and Paulitz, T. 2018. Spatial distribution of root lesion nematodes (Pratylenchus spp.) in a long-term no-till cropping system and their relationship with soil and landscape properties. European Journal of Plant Pathology 150: 1011-1021.
  • Schlatter, D.C., Burke, I., Paulitz, T.C. 2018. Succession of fungal and oomycete communities in glyphosate-killed wheat roots. Phytopathology. 108:582-594.
  • Schlatter, D.C., Schillinger, W.F., Bary, A.I., Sharratt, B.S., Paulitz, T.C. 2018, Dust-associated microbiomes from dryland wheat fields differ with tillage practice and biosolids application. Atmospheric Environment. 185:29-40.
  • Schlatter, D.C., Kahl, K., Carlson, B.R., Huggins, D.R., Paulitz, T.C. 2018. Fungal community composition and diversity vary with soil depth and landscape position in a no-till wheat-based cropping system. FEMS Microbiology Ecology. https://doi.org/10.1093/femsec/fiy098.
  • Hansen, J. C., Schillinger, W. F., Sullivan, T. S. and Paulitz, T. C. 2018. Rhizosphere microbial communities of canola and wheat at six paired field sites. Applied Soil Ecology: 130:185-193.
  • Gebremariam, E. S., Sharma-Poudyal, D., Paulitz, T. C. Erginbas-Orakci, G., Karakay, A., and Dababaat, A. A. 2018. Identity and pathogenicity of Fusarium species associated with crown rot on wheat (Triticum spp.) in Turkey. European Journal of Plant Pathology 150: 387-399.
  • Schroeder, K. L., Schlatter, D. C. and Paulitz, T. C. 2018. Location-dependent impacts of liming and crop rotation on bacterial communities in acid soils of the Pacific Northwest. Applied Soil Ecology 130: 59-68.
  • Knerr, A. J., Wheeler, D., Schlatter, D., Sharma-Poudyal, D., Du Toit, L. and Paulitz, T. C. 2019. Arbuscular mycorrhizal fungal communities in organic and conventional onion crops in the Columbia Basin of the Pacific Northwest, USA. Phytobiomes 2: 194-207.
  • Hansen, J.C., Schillinger, W., Sullivan, T., Paulitz, T.C. 2019. Soil microbial biomass and fungi reduced with canola introduced in long-term monoculture wheat rotations. Frontiers in Microbiology. 10:1488. https://doi.org/10.3389/fmicb.2019.01488.
  • Freed, G., Schlatter D., Paulitz, T. and Dugan, F.2019. Mycological insights into wetland fungal communities: The mycobiome of Camassia in the Pacific Northwest. Phytobiomes Journal doi. 10.1094/PBIOMES-04-19-0022-R
  • Schlatter, D. C., Baugher, C. M., Kahl, D. Huggins, D. R., Johnson-Maynard, J. and Paulitz, T. C. 2019. Bacterial communities of soil and earthworm casts of native Palouse Prairie remnants and no-till wheat cropping systems. Soil Biology and Biochemistry. https://doi.org/10.1016/j.soilbio.2019.107625
  • Wen, N., Manning-Thompson, Y., Garland Campbell, K.A., Paulitz, T.C. 2019. Distribution of cereal cyst nematodes (Heterodera avenae and H. filipjevi) in Eastern Washington State. Plant Disease. https://doi.org/10.1094/PDIS-10-18-1881-SR.
  • Schlatter, D.C., Paul, N.C., Shah, D.H., Schillinger, W.F., Bary, A.L., Sharratt, B.S., Paulitz, T.C. 2019. Biosolids and tillage practices influence soil bacterial communities in dryland wheat. Microbial Ecology. https://doi.org/10.1007/s00248-019-01339-1.
  • Schlatter, D.C., Reardon, C.L., Maynard-Johnson, J.L., Brooks, E., Kahl, K.B., Norby, J., Huggins, D.R., Paulitz, T.C. 2019. Mining the drilosphere: bacterial communities and denitrifier abundance in a no-till wheat cropping system. Frontiers in Microbiology. 10:1339.
  • Kim, D. R., Cho, G., Jeon, C. W., Weller, D. M., Thomashow, L. S., Paulitz, T. C and Kwak, Y. S. 2019. A mutualistic interaction between Streptomyces bacteria, strawberry plants and pollinating bees. Nature Communications. DOI: 10.1038/s41467-019-12785-3.
  • Carter, A. H., Allan, R. E., Shelton, G. B., Burke, A. B., Balow, K. A., Hagemeyer, K. E., Chen, X. M., Engle, D., Garland-Campbell, K. A., Morris, C. F., Murray, T. D., Paulitz, T. C., Clare, S. J. and Klarquist, E. F. 2020. How “Madsen” has shaped Pacific Northwest wheat and beyond. Journal of Plant Registrations. DOI: 10.1002/plr2.20049.
  • Basaid, K., Cheblia, B., Mayad, E.H., Furze, J. N., Bouharroud, R., Krierd, F., Barakata, M. and Paulitz, T. C. 2020. Biological activities of essential oils and lipopeptides applied to control plant pests and diseases: A review. International Journal of Pest Management. doi.org/10.1080/09670874.2019.1707327.
  • Schlatter, D., Yin, C., Hulbert, S. and Paulitz, T. C. 2020. Core rhizosphere microbiomes of dryland wheat are influenced by location and land use history. Appl Environ Microbiol 86:e02135-19.https://doi.org/10.1128/AEM .02135-19.
  • Schlatter, D., Schillinger, W., Hansen, J, Sullivan, T. and Paulitz, T. C. 2020. Common and unique rhizosphere microbial communities of wheat and canola in a semiarid Mediterranean environment. Applied Soil Ecology 144: 170-181. DOI: 10.1016/j.apsoil.2019.07.010
  • Ozer, G., Imren, M., Bayraktar, H. Paulitz, T. C., Muminjanov, J. and Dababat, A. A. 2020. First report of Fusarium hostae causing crown rot on wheat in Azerbaijan. Plant Disease 103: 3278-3279. DOI: 10.1094/PDIS-05-19-1035-PDN.
  • Ozer, G., Alkan, M., Imren, M., Muminjanov, H. Paulitz, T. C. and Dababat, A. A. 2020. Identity and pathogenicity of fungi associated with crown and root rot of dryland winter wheat in Azerbaijan. Plant Disease https://doi.org/10.1094/PDIS-08-19-1799-RE.
  • Dababat, A. A., Imren, M., Ozer, G., Mokrini, F. Duman, N. and Paulitz, T. 2020. Genetic and pathogenic variation in Heterodera latipons populations from Turkey. Nematology: In press
  • Yin, C., McLaughlin, K., Paulitz, T. C., Kroese, D. R. and Hagerty, C. H. Population dynamics of wheat root pathogens under different tillage systems in Northeast Oregon. Plant Disease: https://doi.org/10.1094/PDIS-03-19-0621-RE.
  • Schlatter, D., Kahl, K., Carlson, B., Huggins, D. and Paulitz, T. C. 2020. Soil acidification modifies soil depth-microbiome relationships in a no-till wheat. Soil Biology and Biochemistry: https://doi.org/10.1016/j.soilbio.2020.107939
  • Carter, A.H., Allan, R.E., Balow, K., Burke, A., Chen, X., Engle, D.A., Garland Campbell, K.A., Hagemeyer, K., Morris, C.F., Murray, T., Paulitz, T.C., Shelton, G.
    2020. Impact of wheat cultivar Madsen on Pacific Northwest wheat and beyond. Journal of Plant Registrations. https://doi.org/10.1002/plr2.20049.
  • Basaid, K., Cheblia, B., Mayad, E., Furze, J.N., Bouharroud, R., Krierd, F., Barakate,
    M., Paulitz, T.C. 2020. Biological activities of essential oils and lipopeptides applied to
    control plant pests and diseases: A review. International Journal of Pest Management.
  • Dababat, A., Duman, N., Ozer, G., Mokrini, F., Imren, M., Paulitz, T.C. 2020. Genetic
    and pathogenic variation in Heterodera latipons populations from Turkey. Journal of
    Nematology. https://doi.org/10.1163/15685411-bja10029.
  • Yin, C., Casa Vargas, J.M., Schlatter, D.C. et al. Rhizosphere community selection reveals bacteria associated with reduced root disease. Microbiome 9, 86 (2021). https://doi.org/10.1186/s40168-020-00997-5
  • Yin C, Schlatter DC, Kroese DR, Paulitz TC, Hagerty CH. Responses of Soil Fungal Communities to Lime Application in Wheat Fields in the Pacific Northwest. Front Microbiol. 2021;12:576763. Published 2021 May 20. doi:10.3389/fmicb.2021.576763
  • Krif G, Mokrini F, Aissami AE, Laasli S-E, Imren M, Özer G, Paulitz T, Lahlali R, Dababat AA. Diversity and Management Strategies of Plant Parasitic Nematodes in Moroccan Organic Farming and Their Relationship with Soil Physico-Chemical Properties. Agriculture. 2020; 10(10):447. https://doi.org/10.3390/agriculture10100447
  • Bozoglu, T., Ozer, G., Mustafa, I, Paulitz, T. and Dababat, A. 2021 First report of crown rot caused by Fusarium redolens in Kazakhastan. Plant Disease https://doi.org/10.1094/PDIS-01-21-0015-PDN
  • Gargouri, S., Balmas, V., Burgess, L, Paulitz, T., Laraba, I, Kim H-S, Protctor, R., Busman, M., Felker, F. C., Murray, T. and O’Donnell, K. 2020. An endophyte of Macrochloa tenacissima (esparto or needle grass) from Tunisia is a novel species in the Fusarium redolens species complex. Mycologia https://doi.org/10.1080/00275514.2020.1767493
  • Imren, M. Ozer, G., Paulitz, T. and Dababat, A. 2021. Plant-parasitic nematode communities associated with wheat-growing areas in central,eastern, and south-eastern Kazakhstan. Plant Disease: https://doi.org/10.1094/PDIS-11-20-2424- SR.
  • Wang, M., Van Vleet, S., McGee, R., Paulitz, T., Porter, L, Schroeder, K, Vandemark, G and Chen, W. Chickpea Seed Rot and Damping-Off Caused by Metalaxyl-Resistant Pythium ultimum and Its Management with Ethaboxam. Plant Disease https://doi.org/10.1094/PDIS-08-20-1659-RE
  • Wang, Z, Schlatter, D., Glawe, D., Edwards, C., Weller, D., Paulitz, T., Abatzouglou, J. and Okukara, P. 2021. Native yeast and non-yeast fungal communities of Cabernet Sauvignon berries from two Washington State vineyards, and persistence in spontaneous fermentation, International Journal of Food Microbiology, https://doi.org/10.1016/j.ijfoodmicro.2021.109225.
  • Gargouri, S., Khemir, E. Souissi, A., Paulitz, T. C., Murray, T. D., Fakhfakh, M., I. Achour, I., , Chekali, S., Y. Mliki, L.W. Burgess. 2020. Survey of take-all (Gaeumannomyces tritici) on cereals in Tunisia and impact of crop sequences, Crop Protection, https://doi.org/10.1016/j.cropro.2020.105189.
  • Schlatter, D. C, Hansen, J, Carlson, B., Leslie, I. N. Huggins, D. R. and Paulitz, T. C. 2022. Are microbial communities indicators of soil health in a dryland wheat cropping system? Applied Soil Ecology 170: 10.1016/j.apsoil.2021.104302
  • Yin, C. T., Schlatter, D. C., Kroese, D. R., Paulitz, T. C. and Hagerty, C.H. 2021. Responses of Soil Fungal Communities to Lime Application in Wheat Fields in the Pacific Northwest. Frontiers in Microbiology 10.3389/fmicb.2021.576763
  • Gargouri, S., Boutrous, A., Murray, T. D., Paulitz, T. C., Khemir, E., Souissi, A. Chekali, S. and Burgess, L. W. 2021. Occurrence of eyespot of cereals in Tunisia and identification of Oculimacula species and mating types. Canadian Journal of Plant Pathology 10.1080/07060661.2021.1995501
  • Mokrini, F., Laasli, S., Benseddik, Y., Joutei, A.B., Blenzar, A., Lakhal, H., Sbaghi, M., Imren, M., Ozer, G., Paulitz, T.C., Lahlali, R., Dababat, A.A. 2021. Potential of Moroccan entomopathogenic nematodes for the control of the Mediterranean fruit fly Ceratitis capitata Wiedemann (Diptera: Tephritidae). Scientific Reports. 10. Article 19204. https://doi.org/10.1038/s41598-020-76170-7. LOG NO. 377494
  • Hagerty, C., Gardner, S., Kroese, D.R., Yin, C., Paulitz, T.C., Pscheidt, J.W. 2022. Occurrence of mummy berry associated with huckleberry (Vaccinium membranaceum) caused by Monilinia spp. in Oregon. Plant Disease. 106(2):357-359. https://doi.org/10.1094/PDIS-04-21-0691-SC. LOG NO. 382023
  • Ahmadi, M., Mirakhorli, N., Erginbas-Orakci, G., Ansari, O., Braun, H., Paulitz, T.C., Dababat, A. 2022. Interactions among cereal cyst nematode Heterodera filipjevi, dryland crown rot Fusarium culmorum, and drought on grain yield components and disease severity in bread wheat. Canadian Journal of Plant Pathology. 44(3):415-431. https://doi.org/10.1080/07060661.2021.2013947. LOG NO. 379702
  • Alkan, M., Bayraktar, H., Imren, M., Ozdemir, F., Lahlali, R., Mokrini, F., Paulitz, T.C., Dababat, A.A., Ozer, G. 2022. Monitoring of host suitability and defense-related genes in wheat to Bipolaris sorokiniana. The Journal of Fungi. 8(2). Article 149. https://doi.org/10.3390/jof8020149. LOG NO. 390800