@article {doi:10.1094/PDIS.2000.84.1.4, title = {Managing Port-Orford-Cedar and the Introduced Pathogen Phytophthora lateralis}, journal = {Plant Disease}, volume = {84}, number = {1}, year = {2000}, pages = {4-14}, doi = {10.1094/PDIS.2000.84.1.4}, url = {http://apsjournals.apsnet.org/doi/abs/10.1094/PDIS.2000.84.1.4}, author = {Hansen, Everett M. and Goheen, Donald J. and Jules, Erik S. and Ullian, Barbara} } @article {EverettM.Hansen01012009, title = {Phytophthora rosacearum and P. sansomeana, new species segregated from the Phytophthora megasperma "complex"}, journal = {Mycologia}, volume = {101}, number = {1}, year = {2009}, pages = {129-135}, abstract = {

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.

}, doi = {10.3852/07-203}, url = {http://www.mycologia.org/cgi/content/abstract/101/1/129}, author = {Hansen, Everett M. and Wilcox, Wayne F. and Reeser, Paul W. and Sutton, Wendy} } @article {3992, title = {Phytophthora beyond agriculture}, journal = {Annual Review of Phytopathology}, volume = {50}, year = {2012}, month = {09/2012}, pages = {359 - 378}, abstract = {

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.

}, issn = {0066-4286}, doi = {10.1146/annurev-phyto-081211-172946}, url = {http://www.annualreviews.org/doi/pdf/10.1146/annurev-phyto-081211-172946}, author = {Hansen, Everett M. and Reeser, Paul W. and Sutton, Wendy} }