00499nas a2200145 4500008004100000022001300041245006800054210006700122260001400189300001200203490000700215100001400222700001600236856010100252 1984 eng d a0191291700aImproved method for isolating Phytophthora lateralis from soil.0 aImproved method for isolating Phytophthora lateralis from soil cJune 1984 a517-5190 v681 aHamm, P B1 aHansen, E M uhttps://forestphytophthoras.org/references/improved-method-isolating-phytophthora-lateralis-soil01289nas a2200133 4500008004100000245007700041210006900118300001600187490000700203520077400210100001400984700001600998856014101014 1983 eng d00aPhytophthora pseudotsugae, a new species causing root rot of Douglas-fir0 aPhytophthora pseudotsugae a new species causing root rot of Doug a2626–26310 v613 a

Phytophthora pseudotsugae n. sp. was isolated from rotted roots of Douglas-fir growing in forest tree nurseries in Oregon and Washington. It is distinguished by large oogonia and oospores, mostly paragynous antheridia, and predominantly spherical or ovoid, persistent sporangia borne primarily on simple and unbranched sporangiophores. Sporangia are formed occasionally in liquid culture, rarely in solid media. Phytophthora pseudotsugae is distinguished most readily from P. cactorum by its unbranched sporangiophores and persistent sporangia. It also differs in growth on defined media, electrophoretic protein patterns, and pathogenicity. Comparison is also made with P. iranica, the other species in group 1 of Waterhouse.

1 aHamm, P B1 aHansen, E M uhttp://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=eng&journal=cjb&volume=61&year=1983&issue=10&msno=b83-28901640nas a2200157 4500008004100000022001400041245007200055210006900127260002900196300001400225490000700239520114900246100001401395700001601409856005701425 1982 eng d a1439-032900aPathogenicity of Phytophthora species to Pacific Northwest conifers0 aPathogenicity of Phytophthora species to Pacific Northwest conif bBlackwell Publishing Ltd a167–1740 v123 a

Phytophthora root rot is described for the first time killing sugar pine (Pinus lambertiana) in a seed orchard and four species of true fir (Abies spp.) in a forest nursery. P. cactorum was recovered from true firs and P. megasperma was recovered from sugar pine. P. cryptogea was recovered from sugar pine and true fir but isolates from the two locations differed from each other in pathogenicity and colony appearance. Isolates recovered from these hosts and isolates of 6 Phytophthora species previously recovered from Douglas-fir (Pseudotsuga menziesii) were then tested for pathogenicity on seedlings of 9 Northwest conifers. P. megasperma Group 1, P. cryptogea, and P. cinnamomi were pathogenic to all tree species except western redcedar (Thujaplicata). Western hemlock (Tsuga heterophylla) and true firs were susceptible to most species tested; ponderosa (P. ponderosa) and sugar pines were damaged only by P. cryptogea and P. cinnamomi; western redcedar was resistant to all isolates.

1 aHamm, P B1 aHansen, E M uhttp://dx.doi.org/10.1111/j.1439-0329.1982.tb01390.x00522nas a2200133 4500008004100000245009000041210006900131260002000200300001200220490000700232100001400239700001600253856011900269 1987 eng d00aIdentification of Phytophthora spp. known to attack conifers in the Pacific Northwest0 aIdentification of Phytophthora spp known to attack conifers in t bWSU Pressc1987 a103-1090 v611 aHamm, P B1 aHansen, E M uhttps://forestphytophthoras.org/references/identification-phytophthora-spp-known-attack-conifers-pacific-northwest