00505nas a2200145 4500008004100000245008200041210006900123300000900192490000700201100002300208700002200231700001900253700002000272856006700292 2000 eng d00aManaging Port-Orford-Cedar and the Introduced Pathogen Phytophthora lateralis0 aManaging PortOrfordCedar and the Introduced Pathogen Phytophthor a4-140 v841 aHansen, Everett, M1 aGoheen, Donald, J1 aJules, Erik, S1 aUllian, Barbara uhttp://apsjournals.apsnet.org/doi/abs/10.1094/PDIS.2000.84.1.401828nas a2200157 4500008004100000245011300041210006900154300001200223490000800235520128500243100002301528700002101551700002001572700001801592856006001610 2009 eng d00aPhytophthora rosacearum and P. sansomeana, new species segregated from the Phytophthora megasperma "complex"0 aPhytophthora rosacearum and P sansomeana new species segregated  a129-1350 v1013 a

Phytophthora megasperma sensu lato was a conglomeration of morphologically similar but phylogenetically unrelated species. In this paper we continue the segregation of species from the old P. megasperma complex, formally naming two previously recognized isolate groups. Isolates recovered from rosaceous fruit trees (especially apple and cherry) are in ITS clade 6, related to but distinct from P. megasperma sensu strictu. They are named here Phytophthora rosacearum. They have been referred to previously as the "AC" or "high temperature small oospore" group of P. megasperma. A second group of isolates, earlier called "soybean race non-classifiable", recovered from soybeans in Indiana and other Midwestern states, are morphologically similar to P. megasperma sensu strictu but unrelated to that species, falling in ITS clade 8. They are named here P. sansomeana. Isolates recovered from Douglas-fir seedlings in nurseries in the Pacific Northwest and various weedy hosts in New York State, referred to in earlier work as "P. megasperma DF1", appear to be conspecific with the soybean isolates, although they include certain ITS DNA polymorphisms. Both new species are supported by a combination of new and previously published morphological, growth and molecular data.

1 aHansen, Everett, M1 aWilcox, Wayne, F1 aReeser, Paul, W1 aSutton, Wendy uhttp://www.mycologia.org/cgi/content/abstract/101/1/12901643nas a2200169 4500008004100000022001400041245003600055210003600091260001200127300001400139490000700153520117500160100002301335700002001358700001801378856007701396 2012 eng d a0066-428600aPhytophthora beyond agriculture0 aPhytophthora beyond agriculture c09/2012 a359 - 3780 v503 a

Little is known about indigenous Phytophthora species in natural ecosystems. Increasing evidence, however, suggests that a diverse, trophically complex Phytophthora community is important in many forests. The number of described species has steadily increased, with a dramatic spike in recent years as new species have been split from old and new species have been discovered through exploration of new habitats. Forest soil, streams, and the upper canopies of trees are now being explored for Phytophthora diversity, and a new appreciation for the ecological amplitude of the genus is emerging. Ten to twenty species are regularly identified in temperate forest surveys. Half or more of this Phytophthora diversity comes from species described since 2000. Taxa in internal transcribed spacer (ITS) Clade 6 are especially numerous in forest streams and may be saprophytic in this habitat. Three ecological assemblages of forest Phytophthora species are hypothesized: aquatic opportunists, foliar pathogens, and soilborne fine-root and canker pathogens. Aggressive invasive species are associated with all three groups.

1 aHansen, Everett, M1 aReeser, Paul, W1 aSutton, Wendy uhttp://www.annualreviews.org/doi/pdf/10.1146/annurev-phyto-081211-172946