University of California, Riverside

Department of Nematology

Andreas Westphal Faculty Page

Dr. Andreas Westphal

Andreas Westphal

Assistant Cooperative Extension Specialist, Assistant Nematologist
Kearney Agricultural Research and Extension Center
9240 South Riverbend Avenue, Parlier, CA 93648

Office phone: (559) 646-6555



Peach Root-Knot Nematode Found in Merced and Kern Almond Orchards in California



Dr. Westphal grew up on a farm. This laid the foundation for his interest in biological processes. During his education, he soon became fascinated by the complex interactions in soils especially those of nematodes other microorganisms and the plant. He has worked in this area since his graduate years in very different climate regions of California, Texas, Midwest of the US, and recently northern Germany. He now focuses his work on nematode diseases of vine and tree crops of California.





Ph.D. in Plant Pathology, University of California, Riverside


M.Sc. “Diplom” in Agricultural Sciences, University of Göttingen, Germany


B.Sc. in Agricultural Sciences, University of Göttingen, Germany


Professional Qualification as Farmer, Vadersdorf, Germany


Previous Institutions

2009 - 2014         Julius Kühn-Institut, Braunschweig, Germany

2008 - 2009         The Ohio State University, Wooster, OH

2001 - 2008         Purdue University, West Lafayette, IN

1999 - 2001         Texas A&M University, Weslaco, TX

1999 - 1999         University of California, Davis, CA





Recognition Award for Research Excellence in the Field of Nematology (“Syngenta Award”) 2013. Society of Nematologists.



Association for Communication Excellence in Agriculture, Natural Resources, and Life and Human Sciences (ACE), Bronze Award, Category IV, Publishing for “Winter annual weeds and soybean cyst nematode management”, extension publication.


Selected as one of four "Faces of the Future in Nematology" by the American Phytopathological Society to present a symposium talk on his vision in the field of nematology.


Entomology Education Project Award for the Corn and Soybean Field Guide, 2007 edition.


American Society of Agronomy, Certificate of Excellence for the "2006 Corn and Soybean Field Guide", Purdue University.                


Purdue University Cooperative Extension Specialist Association (PUCESA) team award for efforts on soybean rust.


Gold Award, ACE (Association for Communication Excellence) for the "2005 Corn and Soybean Field Guide", Purdue University.


Certificate of Recognition, Texas Cooperative Extension, Weslaco, TX.


Dissertation Award, Gamma Sigma Delta, University of California, Riverside chapter.


Sustainable Agriculture Graduate Award (SAGA), Sustainable Agriculture Research and Education Program (SAREP), University of California.


Fellow of the Storkan-Hanes Research Foundation


Scholarship from the German Government (DAAD), full support for one year (tuition, living expenses).

Professional Membership

1997                     Gamma Sigma Delta

1994                     American Phytopathological Society

1994                     Society of Nematologists

2004                     Sigma Xi; American Association for the Advancement of Science (AAAS)

2007                     German Phytomedical Society (DPG)

2009                     European Society of Nematologists (ESN)



Dr. Westphal’s research focuses on sustainable nematode management in vine and tree crops using multiple approaches. Key interest areas are:

(I)            Developing nematode-resistant rootstocks

(II)          Using nematode suppressing chemistries including soil fumigants and others

(III)        Integrating soil amendments, cover cropping and biological control management strategies

He conducts these studies in collaboration with researchers of UC, the USDA-ARS, and other Universities 


Meinecke, A. and A. Westphal. 2014. Quantitative reproductive potential of Heterodera schachtii on weeds typical for late summer fallow in sugar beet rotations. Weed Research 54:624-634. DOI: 10.1111/wre.12116.

Meinecke, A., K. Ziegler, K. Bürcky, and A. Westphal. 2014. Composition of the stubble weed flora and its role for Heterodera schachtii in the year preceding sugar beet production. Weed Research 54:614-623. DOI: 10.1111/wre.12108.

Bangemann,L.W., A. Westphal, P. Zwerger, and H. Kage. 2014. Copper reducing strategies for late blight (Phytophthora infestans) control in organic potato (Solanum tuberosum L.) production.Journal of Plant Diseases and Protection 121:105-116.

Westphal, A., C. Li, L.J. Xing, A. McKay, and D. Malvick. 2014. Contributions of Fusarium virguliforme and Heterodera glycines to the disease complex of sudden death syndrome of soybean. PLoS ONE 9(6): e99529. DOI:10.1371/journal.pone.0099529.

Adam, M. A. Westphal, J. Hallmann, and H. Heuer. 2014. Specific microbial attachment to root-knot nematodes in suppressive soil. Applied and Environmental Microbiology 80:2679-2686. DOI: 10.1128/AEM.03905-13.

Xing, L.J. and A. Westphal. 2013. Synergism in the interaction of Fusarium virguliforme with Heterodera glycines in sudden death syndrome of soybean. Journal of Plant Diseases and Protection 120:209-217.

Meinecke, A., A. Hermann, and A. Westphal. 2013. Using a selective fast turn-around bioassay for population density determination of Heterodera schachtii. Nematology 15:809-819.

Westphal, A. 2013. Vertical distribution of Heterodera schachtii under susceptible, resistant or tolerant sugar beet cultivars. Plant Disease 97:101-106.

Mock, V., J.E. Creech, V.R. Ferris, J. Faghihi, A. Westphal, J.B. Santini, and W.G. Johnsons. 2012. Influence of winter annual weed management and crop rotation on soybean cyst nematode (Heterodera glycines) and winter annual weeds – years four and five.Weed Science 60:634-640.

Xing, L.J. and A. Westphal. 2012. Predicting damage of Meloidogyne incognita on watermelon. Journal of Nematology 44:127-133.

Westphal, A. 2011. Sustainable approaches to the management of plant-parasitic nematodes and disease complexes. Journal of Nematology 43:121-124.

Westphal, A., A. Pyrowolakis, R.A. Sikora, and J.O. Becker. 2011. Soil suppressiveness against Heterodera schachtii in California cropping areas. Nematropica 41:161-171.

Westphal, A. and L. J. Xing. 2011. Soil suppressiveness against the disease complex of the soybean cyst nematode and sudden death syndrome of soybean. Phytopathology 101:878-886.

Westphal, A., M.L. Williams, F. Baysal-Gurel, J. Lejeune, B.B. McSpadden-Gardener. 2011. General suppression of E. coli O157:H7 in sand-based dairy livestock bedding. Applied and Environmental Microbiology 77:2113-2121.

Westphal, A., L.J. Xing, and S.B. Goodwin. 2011. Mature Watermelon Vine Decline: suppression with fumigants of a soil-borne problem and association with Rhizopycnis vagum. Crop Protection 30:111-117. online: doi:10.1016/j.cropro.2010.11.014.

Westphal, A., L.J. Xing, R. Pillsbury, and T.J. Vyn. 2009. Effects of tillage on population densities of Heterodera glycines. Field Crops Research113:218-226.

Xing, L.J., and A. Westphal. 2009. Effects of crop rotation of soybean with corn on severity of sudden death syndrome and population densities of Heterodera glycines in naturally infested soil. Field Crops Research 112:107-117.

Robinson, A.F., A. Westphal, C. Overstreet, G.B. Padgett, S.M. Greenberg, T.A. Wheeler, and S.R. Stetina 2008. Detection of suppressiveness against Rotylenchulus reniformis in soil from cotton (Gossypium hirsutum) fields in Texas and Louisiana. Journal of Nematology 40:35-38.

Kruger, G.R., L.J. Xing, A. LeRoy, and A. Westphal. 2008. Meloidogyne incognita resistance in soybean under Midwest conditions. Crop Science 48:716-726. Online: doi: 10.2135/cropsci2007.04.0196.

Westphal, A., J.J. Camberato, N.L. Snyder, and L.J. Xing. 2008. Effects of inoculations with mycorrhizal fungi of soil-less potting mixes during transplant production on watermelon growth and early fruit yield. HortScience 43:354-360.

Creech, J.E., A. Westphal, V.R. Ferris, J. Faghihi, T.J. Vyn, J.B. Santini, and W.G. Johnson. 2008. Influence of winter annual weed management and crop rotation on soybean cyst nematode (Heterodera glycines) and winter annual weeds. Weed Science 56:103-111.

Westphal, A., T.S. Abney, L.J. Xing, and G. Shaner. 2008. Sudden death syndrome of soybean. The Plant Health Instructor, Online, doi:10.1094/PHI-I-2008-0102-01.

[Translated into Spanish: Westphal, A., T.S. Abney, L.J. Xing & G.E. Shaner. 2008. Síndrome de la muerte súbita de la soja. Trans. Silvina L. Giammaria 2008. The Plant Health Instructor. DOI:10.1094/PHI-I-2009-0217-01]

Xing, L.J., and A. Westphal. 2007. Inhibition of Fusarium virguliforme by prokaryotes in vitro. Subtropical Plant Sciences 59:24-29.

Creech, J.E., J.S. Webb, B.G. Young, J.P. Bond, S.K. Harrison, V.R. Ferris, J. Faghihi, A. Westphal and W.G. Johnson. 2007. Development of soybean cyst nematode (Heterodera glycines) on henbit (Lamium amplexicaule) and purple deadnettle (Lamium purpureum). Weed Technology 21:1064-1070.

Creech, J.E., J. Faghihi, V.R. Ferris, A. Westphal, and W.G. Johnson. 2007. Influence of intraspecific henbit (Lamium amplexicaule) and purple deadnettle (Lamium purpureum) competition on soybean cyst nematode (Heterodera glycines) reproduction. Weed Science 55:665-670.

Creech, J.E., J.B. Santini, S.P. Conley, A. Westphal, and W.G. Johnson. 2007. Purple deadnettle (Lamium purpureum) and soybean cyst nematode (Heterodera glycines) response to cold temperature regimes. Weed Science 55:592-598.

Kruger, G.R., Xing, L.J., Santini, J., and A. Westphal. 2007. Distribution and damage caused by root-knot nematodes on soybean in southwest Indiana. Plant Health Progress, Online, doi:10.1094/PHP-2007-1031-01-RS.

Xing, L.-J., and A. Westphal. 2006. Interaction of Fusarium solani f. sp. glycines and Heterodera glycines in sudden death syndrome of soybean. Phytopathology 96:763-770.

Xing, L.-J., and A. Westphal. 2005. A method for field infestation with Meloidogyne incognita. Journal of Nematology 37:500-503.

Creech, J.E., W.G. Johnson, J. Faghihi, V. Ferris, and A. Westphal. 2005. First report of soybean cyst nematode reproduction on purple deadnettle under field conditions. Crop Management, Online, doi:10.1094/CM-2005-0715-01-BR.

Robinson, A.F., R. Akridge, J.M. Bradford, C.G. Cook, W.S. Gazaway, T.L. Kirkpatrick, G.W. Lawrence, G. Lee, E.C. McGawley, C. Overstreet, B. Padgett, R. Rodriguez-Kabana, A. Westphal, and L.D. Young. 2005. Vertical distribution of Rotylenchulus reniformis in cotton fields. Journal of Nematology 37:265-271.

Robinson, A.F., C.G. Cook, A. Westphal, and J.M. Bradford. 2005. Rotylenchulus reniformis below plow depth suppresses cotton yield and root growth. Journal of Nematology 37:285-291.

Westphal, A. 2005. Detection and description of soils with specific nematode suppressiveness. Journal of Nematology 37:121-130.

Westphal, A., and A.W. Scott. 2005. Implementation of soybean in cotton cropping sequences for management of Rotylenchulus reniformis in South Texas. Crop Science 45:233-239.

Westphal, A., A.F. Robinson, A.W. Scott, Jr., and J.B. Santini. 2004. Depth distribution of Rotylenchulus reniformis under crops with different host status and after fumigation. Nematology 6:97-107.

Westphal, A., and T.E. Mirkov. 2003. Need for improved detection of ratoon stunting disease in sugarcane in South Texas. Subtropical Plant Science 55:68-71.

Westphal, A., and J. Smart. 2003. Depth distribution of Rotylenchulus reniformis under different tillage and crop sequence systems. Phytopathology 83:1182-1189.

Westphal, A., G.T. Browne, and S. Schneider. 2002. Evidence for biological nature of the grape replant problem in California. Plant and Soil 242:197-203.

Pyrowolakis, A., A. Westphal, R.A. Sikora, and J.O. Becker. 2002. Identification of root-knot nematode suppressive soils. Applied Soil Ecology 19:51-56.

Westphal, A., and J.O. Becker. 2001. Soil suppressiveness to Heterodera schachtii under different cropping sequences. Nematology 3:551-558.

Westphal, A., and J.O. Becker. 2001. Impact of soil suppressiveness on various population densities of Heterodera schachtii. Annals of Applied Biology 138:371-376.

Westphal, A., and J.O. Becker 2001. Components of soil suppressiveness against Heterodera schachtii. Soil Biology & Biochemistry 33:9-16.

Westphal, A., and J.O. Becker. 2000. Transfer of biological soil suppressiveness against Heterodera schachtii. Phytopathology 90:401-406.

Westphal, A., and J.O. Becker. 1999. Biological suppression and natural population decline of Heterodera schachtii in a California field. Phytopathology 89:434-440.


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General Campus Information

University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

Department Information

Department of Nematology
Margarita Flores
1447 Boyce Hall

Tel: (951) 827-3598
Fax: (951) 827-2364