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Citizen Science Uncovers Phytophthora ramorum as a Threat to Several Rare or Endangered California Manzanita Species.
Plant Dis. 2020 Dec; 104(12):3173-3182.PD

Abstract

The Sudden Oak Death (SOD) Blitzes consist of yearly surveys led by citizen scientists designed to map the distribution of Phytophthora ramorum, cause of the forest disease called SOD, across northern California. During the 2017 Santa Cruz County SOD Blitz, six rare or endangered Arctostaphylos (manzanita) species were found to be possibly symptomatic for the first time. Symptoms included branch cankers and associated canopy mortality, and affected multiple individuals per species. Isolates of P. ramorum were obtained from each of the six species and, through a 30-day-long inoculation experiment on live plants, Koch's postulates were completed for each one of them, conclusively determining that they all are hosts of this pathogen. Two additional manzanita species were later found to be apparently symptomatic in Marin County. Inoculations on detached branches using an isolate of P. ramorum obtained from one of the six rare species from Santa Cruz County were successful, suggesting that these two species may also be hosts of P. ramorum. Detached leaves of all eight species were also successfully inoculated at the University of California-Berkeley in fall 2018 and then again in spring 2019. In these cases, the same isolate was used for all inoculations, in order to obtain information on the comparative susceptibility of the eight species in question. Both branch and leaf inoculations identified significant interspecific differences in susceptibility. The production of sporangia was low on all species but it was not zero, suggesting that sporulation may cause within-plant and limited across-plant contagion, especially in rainy years.

Authors+Show Affiliations

Department of ESPM, University of California, Berkeley, CA 94720, U.S.A.Department of ESPM, University of California, Berkeley, CA 94720, U.S.A.University of California-Santa Cruz Arboretum California Conservation Gardens, Santa Cruz, CA 95064, U.S.A.Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, CA 94901, U.S.A.Department of ESPM, University of California, Berkeley, CA 94720, U.S.A. Department of Life Sciences and Systems Biology, University of Torino, I-10125 Torino, Italy.Department of ESPM, University of California, Berkeley, CA 94720, U.S.A.Department of ESPM, University of California, Berkeley, CA 94720, U.S.A.Department of ESPM, University of California, Berkeley, CA 94720, U.S.A. School of Ag Sciences and Forestry, Louisiana Tech University, Ruston, LA 71270, U.S.A.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33044918

Citation

Garbelotto, Matteo, et al. "Citizen Science Uncovers Phytophthora Ramorum as a Threat to Several Rare or Endangered California Manzanita Species." Plant Disease, vol. 104, no. 12, 2020, pp. 3173-3182.
Garbelotto M, Popenuck T, Hall B, et al. Citizen Science Uncovers Phytophthora ramorum as a Threat to Several Rare or Endangered California Manzanita Species. Plant Dis. 2020;104(12):3173-3182.
Garbelotto, M., Popenuck, T., Hall, B., Schweigkofler, W., Dovana, F., Goldstein de Salazar, R., Schmidt, D., & Sims, L. L. (2020). Citizen Science Uncovers Phytophthora ramorum as a Threat to Several Rare or Endangered California Manzanita Species. Plant Disease, 104(12), 3173-3182. https://doi.org/10.1094/PDIS-03-20-0619-RE
Garbelotto M, et al. Citizen Science Uncovers Phytophthora Ramorum as a Threat to Several Rare or Endangered California Manzanita Species. Plant Dis. 2020;104(12):3173-3182. PubMed PMID: 33044918.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Citizen Science Uncovers Phytophthora ramorum as a Threat to Several Rare or Endangered California Manzanita Species. AU - Garbelotto,Matteo, AU - Popenuck,Tina, AU - Hall,Brett, AU - Schweigkofler,Wolfgang, AU - Dovana,Francesco, AU - Goldstein de Salazar,Ruby, AU - Schmidt,Doug, AU - Sims,Laura Lee, Y1 - 2020/10/12/ PY - 2020/10/13/pubmed PY - 2020/10/13/medline PY - 2020/10/12/entrez KW - emergent disease KW - endemic disease KW - novel host KW - sudden oak death KW - threatened plants SP - 3173 EP - 3182 JF - Plant disease JO - Plant Dis VL - 104 IS - 12 N2 - The Sudden Oak Death (SOD) Blitzes consist of yearly surveys led by citizen scientists designed to map the distribution of Phytophthora ramorum, cause of the forest disease called SOD, across northern California. During the 2017 Santa Cruz County SOD Blitz, six rare or endangered Arctostaphylos (manzanita) species were found to be possibly symptomatic for the first time. Symptoms included branch cankers and associated canopy mortality, and affected multiple individuals per species. Isolates of P. ramorum were obtained from each of the six species and, through a 30-day-long inoculation experiment on live plants, Koch's postulates were completed for each one of them, conclusively determining that they all are hosts of this pathogen. Two additional manzanita species were later found to be apparently symptomatic in Marin County. Inoculations on detached branches using an isolate of P. ramorum obtained from one of the six rare species from Santa Cruz County were successful, suggesting that these two species may also be hosts of P. ramorum. Detached leaves of all eight species were also successfully inoculated at the University of California-Berkeley in fall 2018 and then again in spring 2019. In these cases, the same isolate was used for all inoculations, in order to obtain information on the comparative susceptibility of the eight species in question. Both branch and leaf inoculations identified significant interspecific differences in susceptibility. The production of sporangia was low on all species but it was not zero, suggesting that sporulation may cause within-plant and limited across-plant contagion, especially in rainy years. SN - 0191-2917 UR - https://www.unboundmedicine.com/medline/citation/33044918/Citizen_Science_Uncovers_Phytophthora_ramorum_as_a_Threat_to_Several_Rare_or_Endangered_California_Manzanita_Species. L2 - https://apsjournals.apsnet.org/doi/10.1094/PDIS-03-20-0619-RE?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -