| population structure of pythium irregulare, p. ultimum, and p. sylvaticum in forest nursery soils of oregon and washington. | pythium species are important soilborne pathogens occurring in the forest nursery industry of the pacific northwest. however, little is known about their genetic diversity or population structure and it is suspected that isolates are moved among forest nurseries on seedling stock and shared field equipment. in order to address these concerns, a total of 115 isolates of three pythium species (p. irregulare, p. sylvaticum, and p. ultimum) were examined at three forest nurseries using simple sequen ... | 2015 | 25607720 |