Were the initial outplantings of P. ramorum-infested plants ever traced back to a source nursery?

Phytophthora ramorum was not discovered as the causal agent of sudden oak death until 2000-2001.  Prior to then, it was not understood to be a nursery issue; therefore, there was no concern about spread from nurseries into the wildlands.  Since then, DNA analysis has confirmed that the pathogen was unknowingly introduced to both California and […]

After taking down a P. ramorum-infested bay tree, can the foliage be left onsite to decompose?

Once down, spores from bay foliage will not travel nearly as far as they do in the canopy. The concern on the ground is that infested leaves, while still fresh, could have spores picked up during a wet event from soil splash onto the trunk of the tree. So, spread bay foliage in a thin […]

Can the Garbelotto lab analyze wood chips for pathogens?

The lab can, upon request, analyze wood chips at cost ($90 US dollars per sample).  Testing would confirm the presence or absence of any known dangerous pathogens.

What is Sudden Oak Death?

SOD is an exotic disease caused by the microscopic pathogen Phytophthora ramorum, estimated to have been introduced into California 20-25 years ago from unknown region of the world. P. ramorum was unwittingly introduced into California’s natural landscape when infected ornamental plants, such as Rhododendrons and Camellias (which carry the disease), were outplanted into the environment. […]

Review Article – Invasions by Forest Pathogens

Molecular analysis to study invasions by forest pathogens: examples from Mediterranean ecosystems Journal Article Biological invasions by exotic plant pathogens in Mediterranean ecosystems are characterized using molecular analysis.

Heterobasidion: A Disposition of Two North American Species

What’s in a name? Two of the most serious wood pathogens of conifers worldwide have been renamed by U.C. Berkeley and US Forest Service scientists. Because of the significant economic and scientific importance of these organisms, and because one of them was introduced in Europe by US soldiers during World War II, this is a […]

Island Biogeography and Fire – Kabir Peay

Island Biogeography and Fire Affecting Ectomycorrhizal Colonization of “Tree Islands” Ecology 2010 Plant Soil 2010 Journal of Ecology 2009 Ecology Letters 2007 Fungi are a critical component of the diversity and function of terrestrial ecosystems. Pathogens and mycorrhizal fungi receive a large, direct share of net primary productivity, and wood decay and mycorrhizal fungi play […]

Quarantine Alert – Heterobasidion irregulare

The U.C. Berkeley Forest Pathology Lab directed by Matteo Garbelotto and the Gonthier Lab at the University of Turin, Italy, have jointly discovered the US military transported H. irregulare from North America to Italy in 1944, and have spearheaded most of the research on its invasion process. In October 2013, thanks to their efforts, Heterobasidion […]

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