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Title: Suppression of Phytophthora ramorum infestations through silvicultural treatment in California's north coast

Author: Valachovic, Yana; Lee, Chris; Twieg, Brendan; Rizzo, David; Cobb, Richard; Glebocki, Radoslaw;

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: 108-113

Publication Series: General Technical Report (GTR)

   Note: This article is part of a larger document. View the larger document

Description: In 2006, three forested sites infested with Phytophthora ramorum in Humboldt County, California were subjected to different combinations of treatments designed to reduce inoculum and control spread. One treatment, consisting of removal of all California bay laurel (Umbellularia californica (Hook. & Arn.) Nutt.) and tanoak (Notholithocarpus densiflorus (Hook. & Arn.) Manos, Cannon & S.H. Oh) trees, was applied at all three sites, and other treatments were applied as case studies at single sites. The sites were monitored for 6 years. Results to date suggest that the treatments that involved the cutting of California bay laurel and tanoak substantially reduced P. ramorum inoculum levels. However, in treatment areas where scattered California bay laurel trees were inadvertently missed because of a restricted time window for operations, a relatively minor component of residual California bay laurel trees may have become infected following treatment and/or harbored prior cryptic infections and subsequently spread P. ramorum to regenerating California bay laurel and tanoak. The data suggest that pathogen reestablishment in these sites was driven by both incomplete treatment application and spread from adjacent, untreated stands.

Keywords: Phytophthora ramorum, silvicultural treatment, infestation suppression

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Valachovic, Yana; Lee, Chris; Twieg, Brendan; Rizzo, David; Cobb, Richard; Glebocki, Radoslaw. 2013. Suppression of Phytophthora ramorum infestations through silvicultural treatment in California's north coast. 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: 108-113.

 


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