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    Author(s): Matteo Garbelotto; Doug Schmidt
    Date: 2013
    Source: In: Frankel, S.J.; Kliejunas, J.T.; Palmieri, K.M.; Alexander, J.M. tech. coords. Proceedings of the sudden oak death fifth science symposium. Gen. Tech. Rep. PSW-GTR-243. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: p. 120
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (0 B)

    Description

    Application of phosphonate compounds has been shown to be an effective preventive treatment for sudden oak death (SOD), caused by Phytophthora ramorum, in coast live oak (Quercus agrifolia Née) and tanoak (Notholithocarpus densiflorus Manos, Cannon & S.H. Oh). To test the effectiveness of these treatments in a natural setting, paired 400 m2 sections of mixed evergreen/tanoak stands were randomly designated as either treatment or control plots, and topically treated with Agri-Fos® systemic fungicide. The experiment included 36 field plots in six California counties, including nearly 700 tanoak trees <8cm dbh. Both tree canopy and trunk conditions were visually assessed and scored for overall health and the presence of SOD symptoms each fall from 2006 until 2012. In the fall of 2009, five injection treatment plots, located near the existing plots, were added to the experiment.

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    Citation

    Garbelotto, Matteo; Schmidt, Doug. 2013. Effect of phosphonate treatments for sudden oak death on tanoaks in naturally infested forests. In: Frankel, S.J.; Kliejunas, J.T.; Palmieri, K.M.; Alexander, J.M. tech. coords. Proceedings of the sudden oak death fifth science symposium. Gen. Tech. Rep. PSW-GTR-243. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: p. 120.

    Keywords

    Sudden oak death, Phytophthora ramorum, invasive species, tanoak, Notholithocarpus densiflorus, coast live oak, Quercus agrifolia, Japanese larch, Larix kaempferi

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