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UCANR: Protecting California's natural resources
Invasive Spotlight: Sudden Oak Death
Published on: June 7, 2020
Tanbark oaks killed by Phytophthora ramorum. (Credit: P Svihra)
Tanbark oaks killed by Phytophthora ramorum. (Credit: P Svihra)
 
 
Sudden oak death is a disease of oak trees that is caused by an invasive plant pathogen Phytophthora ramorum. The disease has been found infecting trees in coastal California counties from Monterey to Humboldt and can be spread by moving infested soil and plant material.

In California, P. ramorum is primarily a leaf pathogen and thrives in coastal tanoak/redwood forests and oak woodlands. There are two categories of hosts for P. ramorum....

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Public Value: UCANR: Protecting California's natural resources
Tags: California (31), disease (47), invasive (47), invasive species action week (6), pest (112), phytophthora (2), phytophthora ramorum (3), SOD (3), sudden oak death (5), UC IPM (305)
Focus Area Tags: Natural Resources, Pest Management, Yard & Garden
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Phytophthora tentaculata: A New Exotic and Invasive Disease
Published on: December 19, 2016
Fig. 1 (a) Dying and dead Diplacus aurantiacus (orange bush monkeyflower) with advanced above ground symptoms, typical of Phytophthora disease. The infected plant has chlorotic (yellowing and browning) foliage. [L. Sims]
Fig. 1 (a) Dying and dead Diplacus aurantiacus (orange bush monkeyflower) with advanced above ground symptoms, typical of Phytophthora disease. The infected plant has chlorotic (yellowing and browning) foliage. [L. Sims]

[From the December 2016 issue of the UC IPM Green Bulletin]

A new plant pathogen in the genus Phytophthora (pronounced Fie-TOF-ther-uh) has recently been found in several California native plant nurseries and habitat restoration sites. The pathogen, Phytophthora tentaculata, poses a risk of disease in wildlands, gardens and landscapes that use susceptible California native and non-native plants. Once introduced in these areas, the pathogen can generate disease for years to come, potentially causing lasting environmental and economic...

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Tags: disease (47), exotic (11), fusarium (5), invasive (47), phytophthora (2), sudden oak death (5), tentaculata (1)
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