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    Author(s): Anna Brown; Clive Brasier
    Date: 2008
    Source: In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. p. 155
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (142 KB)

    Description

    The aetiology and frequency of Phytophthoras in discoloured xylem tissue beneath phloem lesions was investigated in a range of broadleaved trees infected with P. ramorum, P. kernoviae and several other Phytophthoras. Isolation was attempted from the inner surface of 81, 6 x 4 cm sterilised discoloured wood panels from 53 trees. Discolouration mostly extended 1 to 5 mm into the xylem (75 percent) but incursions of 6 to 10 mm (10 percent) and 10 to 25 mm (15 percent) were frequent. Phytophthora was isolated from 81 percent of the wood panels. In 66 cases, both a wood panel and an overlying phloem panel were sampled. In 56 percent of these Phytophthora was isolated from both the wood and the phloem panel. In 23 percent it was isolated from the wood panel only and in 8 percent from the phloem panel only.

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    Citation

    Brown, Anna; Brasier, Clive 2008. Invasion of xylem of mature tree stems by Phytophthora ramorum and P. kernoviae. In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. p. 155

    Keywords

    Phytophthora, bark lesions, bleeding cankers, phloem, tree stem diseases, wood, xylem

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