First report of the NA2 clonal lineage of the sudden oak death pathogen, , infecting tanoak in Oregon forests.

Werres, de Cock & Man in't Veld, causal agent of sudden oak death (SOD) and ramorum leaf blight, is comprised of four clonal lineages in its invasive ranges of North America and Europe (Grünwald et al. 2012, Van Poucke et al. 2012).

Phylogeography of the wide-host range panglobal plant pathogen Phytophthora cinnamomi.

Various hypotheses have been proposed regarding the origin of the plant pathogen Phytophthora cinnamomi. P. cinnamomi is a devastating, highly invasive soilborne pathogen associated with epidemics of agricultural, horticultural and forest plantations and native ecosystems worldwide.

Soilborne and Diversity From Rhododendron in Propagation, Container, and Field Production Systems of the Pacific Northwest.

Rhododendron root rot is a severe disease that causes significant mortality in rhododendrons. Information is needed about the incidence and identity of soilborne and species causing root rot in Pacific Northwest nurseries in order to better understand the disease etiology and to optimize disease control strategies. The last survey focusing solely on soilborne oomycete pathogens in rhododendron production was conducted in 1974.

Population Structure of on in Oregon Nurseries.

is a recently described plant pathogen, formerly recognized as . Recent sampling of Pacific Northwest nurseries frequently encountered this pathogen, and it has been shown to be among the most damaging pathogens on ornamentals. We characterized the population structure of in a survey of four Oregon nurseries across three different counties with focus on hosts.