Becky B. Westerdahl

Dr. Becky Westerdahl

Position Title
Extension Specialist and Professor of Nematology


Appointment: 1986
B.S., Chapman University, 1972, Biology
Ph.D., University of California, Riverside, 1978, Biology / Nematology

Research Program

Program Highlights

Teaching Program

Courses Taught

Cooperative Extension Program

Nematode Management in California

Research Interests

Applied nematology, integrated pest management, nematology extension

Selected Publications:

Hasey, J. K., B. B. Westerdahl, and B. Lampinen. 2004. Long-term performance of own-rooted ‘Chandler’ walnut compared to ‘Chandler’ walnut on Paradox rootstock. Acta Hort. (ISHS) 636:83-86.

Westerdahl, B. B., M. A. Harivandi, L. Costello, M. McCullough, and P. Gross. 2004. Management of plant-parasitic nematodes on turfgrass in Northern California. Acta Hort. 661:531-533.

Kabir, Z., S. A. Fennimore, J. M. Duniway, F. N. Martin, G. T. Browne, C. Q. Winterbottom, H. A. Ajwa, B. B. Westerdahl, R. E. Goodhue, and M. J. Haar. 2005. Alternatives to methyl bromide for strawberry runner plant production. HortScience 40:1709-1715.   

Qiu, J. J., B. B. Westerdahl, C. Anderson, and V. M. Williamson. 2006. Sensitive PCR Detection of Meloidogyne arenariaM. incognita, and M. javanica  extracted from soil. Journal of Nematology 38:434-441.

Westerdahl, B.B. and M.A. Harivandi. 2007. Variability in populations of plant parasitic nematodes on turfgrass. Acta Horticulturae 762:139-142.

Westerdahl, B.B., and C.A. Frate.  2007. Parasitic nematodes in alfalfa. IN (C.G. Summers and D.H. Putnam, eds.), Irrigated alfalfa management for Mediterranean and Desert zones. Chapter 11. Oakland:  University of California Agriculture and Natural Resources Publication 8297. 12 pp.

Fennimore, S. A., J.M. Duniway, G.T. Browne, F.N. Martin,  H.A. Ajwa, B.B. Westerdahl,  R.E. Goodhue, M. Haar, and C. Winterbottom. 2008. Methyl bromide alternatives evaluated for California strawberry nurseries. California Agriculture. 62(2):62-67.

Klose, S., H.A. Ajwa, G.T. Browne, K.V. Subbarao, F.N. Martin, S.A. Fennimore, and B.B. Westerdahl. 2008.  Dose Response of Weed Seeds, Plant-Parasitic Nematodes, and Pathogens to Twelve Rates of Metam Sodium in a California Soil. Plant Disease. 92(11):1537-1546.

Giat, E., R. Kaspi,  C. A. Anderson, B. B. Westerdahl.  2008, Seasonal Population Dynamics of the Plant-parasitic Nematode,  Anguina pacificae on Golf Course Putting Greens in California. Journal of Nematology 40:252-257.

Harivandi, M.A., and B. B. Westerdahl. 2009. Evaluation of Nematicides, Fungicides,Insecticides, Molluscicides and Fertilizers for Nematode Management in Turfgrass in California. International Turfgrass Society Research Journal 11:1-5.

Qiu, J.J.,  B. B. Westerdahl, and A. Pryor. 2009. Reduction of Root-Knot Nematode,  Meloidogyne javanica, and Ozone Mass Transfer in Soil Treated with Ozone. Journal of Nematology 41:241-246.

Giraud, D, L. J. Riddle, C. E. Anderson and B B. Westerdahl. 2011. New Products to Improve Growth of Field Grown Easter Lily Bulbs. Acta Hort. 900:333-337.

Westerdahl, B. 2011. Cultural Methods for Managing Nematodes on Vegetables and Ornamentals. Acta Hort., 911: 185-198.

Westerdahl, B. B. and J. D. Radewald. 2011. Natural Products for Nematode Management in Tomatoes. Acta Hort., 914: 275-280.

Westerdahl, B. B., R. Buchner, J. Edstrom, W. Krueger, and W.Olson. 2012. Population Fluctuations of Ring Nematode (Mesocriconema xenoplax) in Prune Orchards in California. Acta Hort., 985: 241-247.

McKenry, M.V. and B.B. Westerdahl: Nematodes. 2012. Prune Production Manual, R. P. Buchner, (ed), Division of Agriculture and Natural Resources, University of California, Oakland, CA (publication 3507), Vol. 19, pp. 6pp.

Westerdahl, B., D. Long, and C. T. Schiller. 2014. Nimitz (MCW-2) for Management of Root-knot Nematode on Annual Crops. Acta Horticulturae, 1044: 353-358.

Westerdahl, B. D. Long, C. T. Schiller, C. A. Wilen. 2015. Nimitz (MCW-2) for Management of Root-knot Nematode in Tomatoes. Acta Horticulturae, 1069: 260-264.

Westerdahl, B. 2015. Biological Control of Plant-Parasitic Nematodes: Soil Ecosystem Management in Sustainable Agriculture, Second Edition. 79(3): 972.

Triky-Dotan, Shachaf, Becky Westerdahl, Frank N. Martin, Krishma Subbarao, Steven T. Koike, and Husein A. Ajwa. 2016. Fumigant dosages below maximum label rate control some soilborne pathogens. California Agriculture, 70(3): 130-136. 

Chastagner, Gary A., Jaap M. van Tuyl, Martin Verbeek, Bill Miller, and Becky B. Westerdahl. 2017. Chapter 41: Diseases of Lily, Robert J. McGovern and Wade H. Elmer, (ed), Handbook of Florists' Crops Diseases, Handbook of Plant Disease Management, Springer International Publishing AG 2017.

Westerdahl, B. B. 2017. Using trap crops to manage plant parasitic nematodes on annual crops. Acta Horticulturae -Submitted

Gao, S., D.A. Doll, M.S. Stanghellini, B.B. Westerdahl, D. Wang, and B.D. Hanson. 2018. Deep injection and the potential of biochar to reduce fumigant emissions and effects on nematode control. Journal of Environmental Management, 223: 469-477. 

Chitambar, J.J., B.B. Westerdahl, and S.A. Subbotin. 2018. Chapter 21. Plant Parasitic Nematodes in California Agriculture, Subbotin, S.A., and J.J. Chitambar, (ed), Plant Parasitic Nematodes in Sustainable Agriculture of North America Volume 1: Canada, Northeastern, Midwestern and Southern USA, Springer. SUBMITTED