California Agriculture
California Agriculture
California Agriculture
University of California
California Agriculture

Steven Swain

Photo of Steven Swain
Environmental Horticulture Advisor
Cooperative Extension Marin County
1682 Novato Boulevard
Suite 150-B
Novato, CA 94947
(415) 473-4204 Create VCard

Also in:
Sonoma County



M.S. Environmental Horticulture, UC Davis. 2001


Woody plants and their pests and diseases, integrated pest management, water use and conservation, defensible space for fire

Areas of Expertise (click to see all ANR academics with this expertise)


Peer Reviewed

  • Lacan, I; Swain, SV; Perry, EJ (2022). Mistletoes. Pest Note. UC IPM. 7437, 6.
  • Valachovic, Y; Quarles, S; SV, Swain (2021). Reducing the vulnerability of buildings to wildfire: Vegetation and landscaping guidance. UC ANR. 8695, 1-12.
  • Downer, AJ; Swain, SV; Crump, A (2020). Anthracnose. Pest Note. UC IPM. 7420, 1-5.
  • Swain, Steven; Schmidt, D; M, Garbelotto (2020). Bark scribing as a treatment for sudden oak death: a case study in why controls matter. Proceedings of the 7th Sudden Oak Death Science and Management Symposium: Healthy Plants in a World With Phytophthora. USDA. PSW-GTR 268, 26-27.
  • Garbelotto, M; Schmidt, D; Swain, S; Hayden, K; Gugliemo, L (2017). The ecology of infection between a transmissive dead-end host provides clues for the treatment of a plant disease. Ecosphere. 8:5, 1-20.
  • Swain, SV; Garbelotto, M (2015). "Phytophthora ramorum can survive introduction into finished compost." California Agriculture 69(4): 237-241.
  • Bauermeister, M.; Savio, Y.; Surls, R.; Swain, S.V. (2013). Community Gardens. UC ANR. 8499, 1-16.
  • DiTomaso, J.M..; Roncoroni, J.; Swain, S.V.; Wright, S.D. (2013). Poison Hemlock. Pest Note. UC IPM. 74162, 1-4.
  • Swain, S.V.; Koike, S.T. (2012). "First report of twig canker on willow caused by Colletotrichum acutatum in California." Plant Disease 96(12): 1822.
  • Euphrat, F.D.; Swain, S.V.; Swanhuyser, D.; Butler, J.; Chesnut, A.; Batchelder, K.; Safford, C.; Cummings, E. (2012). Protecting forests across landscapes and through generations: the Sonoma County Forest Conservation Working Group. Proceedings of the Cost Redwood Forests in a Changing California: A Sympoium for Scientists and Managers. USDA FS. PSW-GTR 238:2, 603-609.
  • Alexander, J.; Swain, S.V. (2010). Sudden Oak Death. Pest Note 74151. UC IPM. 1-8.
  • Swain, S.V.; Schmidt, D.; Garbelotto, M. (2008). Preservation of Lithocarpus densiflorus diversity on California's Central Coast, a cooperative project with area residents. Proceedings of the Sudden Oak Death Third Science Symposium. USDA FS. PSW-GTR 214, 471-474.
  • Vettraino, A.M.; Huberli, D.; Swain, S.; Smith, A.; Garbelotto, M. (2006). "A new report of Phytophthora ramorum on Rhamnus purshiana in Northern California." Plant Disease 90: 246.
  • Swain, S.V.; Harnik, T; Mejia-Chang, M.; Hayden, K.; Bakx, W.; Creque, J.; Garbelotto, M (2006). "Composting is an effective treatment option for sanitization of Phytophthora ramorum infected plant material." Journal of Applied Microbiology 101: 815-827.
  • Swain, S.V.; Garbelotto, M. (2006). Extended abstract on the potential of Phytophthora ramorum to infect finished compost. Proceedings of the Sudden Oak Death Second Science Symposium. USDA FS. PSW-GTR 196, 483-486.
  • Vettraino, A.M.; Huberli, D.; Swain, S.; Beinapfl, J.C.; Smith, A.; Garbelotto, M. (2006). "First report of infection of maidenhair fern (Adiantum jordanii and A. aleuticum) by Phytophthora ramorum in California." Plant Disease 90: 379.
  • Huberli, D.; Reuther, K.D.; Smith, A.; Swain, S.; Tse, J.G.; Garbelotto, M. (2004). "First report of foliar infection of Rosa gymnocarpa by Phytophthora ramorum." Plant Disease 88: 430.

Non-Peer Reviewed

  • Swain, S.V.; B., Robertson (In Press). Mediterranean oak borer. Marin Independent Journal.
  • Swain, S.V. (2023). Sudden oak death. Green Bulletin. UC IPM. 3:2, 1-3. 9/11/2023.
  • Lando, T; Kaspar, J; Mark, F; McCabe, M; Shortall, R; Swain, S; Swezy, M; Weber, J (2021). Ecologically Sound Practices for Defensible Space. Ecologically Sound Practices for Vegetation Management. Marin Wildfire Prevention Authority. 20.
  • Dirkse, A; Swain, S; Lewis, D. (2020). Japanese Knotweed Pocket Guide. UCCE Marin Publication. 1.
  • Swain, S; Schmidt, D; M, Garbelotto (2019). Managing sudden oak death: What works, and what doesn't. International Oaks. 30, 378-379.
  • Sims, L; Lacan, I; Swain, S.V; Garbelotto, M (2017). Phytophthora tentaculata: A new exotic and invasive disease. Western Arborist. 43, 48-50.
  • Swain, S.V; Eskalen, A; Lynch, S; Latham, S. (2017). Scolytid beetles and associated fungal symbionts threaten California hardwoods. Western Arborist. 43:1, 54-60.
  • Swain, SV (2016). Oaks as a component of rangeland management. Sonoma-Marin Farm News. 17.
  • Sims, L; Lacan, I; Swain, S; Garbelotto, M (2016) Phytophthora tentaculata, a new exotic and invasive disease. Retail Garden Center and Nursery IPM News 6, 3-4
  • Sims, L; Lacan, I; Swain, S; Garbelotto, M (2016) Phytophthora tentaculata, a new exotic and invasive disease. Green Bulletin 6, 3-5
  • Swain, SV (2015). Compost Tea. Western Arborist. ISA. 41:2, 22-23.
  • Swain, SV; Windbiel-Rojas, K (2015) Dealing with pantry pests. Retail Nursery and Garden Center IPM 5, 3
  • WD, Tietje; SV, Swain (2015). Help your oak tree tolerate severe drought. UCCE San Luis Obispo. 2.
  • Swain, SV (2015) Pines, Drought, & Beetles. Green Bulletin 5, 1,3
  • Swain, S.V. (2014) Biological fungicides: Do they work, and are they safe? Green Bulletin 4, 1-2
  • Swain, S.V. (2014). "Forest Stewardship." from
  • Swain, S.V. (2014). "Irrigation and Watering Guidelines." from
  • Swain, S.V. (2014). "Managing your curb appeal with less water." Retrieved 18 Dec 2014, from
  • Myers, M; S, Swain; D, Giraud (2014). North Coast Rain Gardens. UCCE Marin. 6.
  • Swain, S.V. (2014). "Oak Identification." from
  • Swain, S.V. (2013) Compost Tea. Green Bulletin 3, 4
  • Swain, S.V.; Koike, S.T. (2013). Distribution and host range of Colletotrichum acutatum on Salicaceae in San Francisco's North Bay area. Meeting Poster. American Phytopathological Society.
  • Swain, S.V. (2012) A new seed bug (Metapoplax ditomoides). Green Bulletin 2, 6
  • Swain, S.V. (2012) How irrigation practices can affect pest problems. Green Bulletin 2, 1,5
  • Parnay, S.; Swain, S.V. (2012). "PSA: A healthy soil is worth its weight in gold." Retrieved 18 Dec 2014, from
  • Bauermeister, M.; Swain, S.V.; Rilla, E. (2010). Marin County Community Garden Needs Assessment. UCCE Marin. 1-65.
  • Swain, S.V. (2007). Mortality projections and treatment recommendations for sudden oak death. Western Arborist. 33:2, 48-50.
  • Swain, S.V. (2002). "An Update on Phytophthora ramorum, causal agent of Sudden Oak Death." International Oaks 13: 38-45.
  • Swain, S.V. (2002). Composting Issues With Clopyralid. A Master Gardeners' information and FAQ list. UCCE Sonoma. 2 pp.

California Agriculture Article Contributions

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