Index Catalog // ScholarsArchive@OSU

Biology of chlamydospores of Phytophthora ramorum

Creator:: Smith, Aaron Lee
Abstract:: The chlamydospore is a survival spore produced by 35 of the 75 described species of Phytophthora. Phytophthora ramorum Werres, de Cock & Man in't Veld, the causal agent of Sudden Oak Death (SOD), produces abundant chlamydospores in artificial culture and plant tissue. The chlamydospore is likely the most important survival...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: Everett M. Hansen The chlamydospore is a survival spore produced by 35 of the

Morphological variation, taxonomy, and host specificity of Phytophthora megasperma

Creator:: Hamm, Philip B.
Resource Type:: Masters Thesis
Full Text:: HOST SPECIFICITY OF PHYTOPHTHORA MEGASPERMA Abstract approved: Redacted for privacy Everett M. Hansen

Environmental factors influencing the rate of spread of Phellinus weirii (Murr.) Gilbertson in young-growth Douglas-fir

Creator:: Angwin, Peter A.
Abstract:: Studies to identify the environmental factors that influence the rate of ectotrophic mycelial growth of Phellinus weirii (Murr.) Gilbertson along Douglas-fir roots were undertaken both in the laboratory and in the field. The effects of soil pH, nitrogen, moisture, temperature, microorganisms and bulk density were investigated. In the lab, the...
Resource Type:: Masters Thesis
Full Text:: Oregon State University: Dr. Everett Hansen, who made all of this possible. Dr. Lewis Roth and Dr. Earl

Histological examination of Phytophthora ramorum in Notholithocarpus densiflorus bark tissues

Creator:: Botts, Molly M.
Abstract:: Colonization of N. densiflorus tissues by P. ramorum is not well understood. The pathogen is able to colonize nearly all tissues of this host but it is unclear how a tree is ultimately killed. Because this is such a destructive invasive pathogen, it is important to investigate its pathogenic strategy....
Resource Type:: Masters Thesis
Full Text:: _________________________________________________________________________ Everett M. Hansen Colonization of N. densiflorus tissues by P. ramorum is not well

Susceptibility of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

Creator:: Saavedra, Angel Luis
Abstract:: In early 2000, unusual mortality of a native North American tree, golden chinquapin, was reported by the USDA-Forest Service. Dying trees exhibited girdling cankers in the inner bark of the lower bole, branch flagging and defoliation. Isolations from necrotic tissues and soil associated with diseased or killed trees yielded Phytophthora...
Resource Type:: Masters Thesis
Full Text:: . Abstract approved:_ Everett 1\¥. Hansen In early 2000, unusual mortality of a native North American tree

The infection and colonization of Douglas-fir needles by the Swiss needle cast pathogen, Phaeocryptopus gaeumannii (Rhode) Petrak

Creator:: Capitano, Bryan R.
Abstract:: Phaeocryptopus gaeumannii is a pathogenic fungus on Douglas-fir needles which has become a serious threat to timber production in the last decade along the Oregon coast This research was undertaken to describe the general biology and pathology of F. gaeumannii on Douglas-fir needles and how environmental variables affect fungal development....
Resource Type:: Masters Thesis
Full Text:: (Rhode) Petrak, Abstract approved: Everett M. Hansen Phaeocryptopus gaeumannii is a pathogenic fungus

Trichoderma spp. : distribution in stumps infested with Phellinus weirii and growth and antagonism in vitro

Creator:: Goldfarb, Barry
Abstract:: To determine which isolates will most rapidly replace Phellinus weirii in stumps and roots, Trichoderma spp. were isolated from P. weirii-infested stumps and roots, identified, and examined for growth rates and lethal effects on P. weirii in vitro. Phellinus weirii-infested Douglas-fir stumps and stump roots were sampled for microorganisms by...
Resource Type:: Masters Thesis
Full Text:: . ii Redacted for privacy Abstract approved. , Everett M. Hansen To determine which isolates will

Pathogenicity of Phytophthora species from Oregon waterways

Creator:: Navarro, Sarah M.
Abstract:: Described as one of the most destructive pathogens of agricultural crops and forest trees, Phytophthora is a genus of microorganisms containing over 100 known species. Phytophthora alni has caused collar and root disease in alders throughout Europe and a form of the species has recently been isolated in North America....
Resource Type:: Masters Thesis
Full Text:: : Everett M. Hansen Described as one of the most destructive pathogens of agricultural crops and forest

Factors affecting inter-tree root contact and the transmission of Phellinus weirii in young-growth Douglas-fir

Creator:: Reynolds, Keith M.
Abstract:: Groups of second-growth Douglas-fir (Mirb.) Franco were excavated in plots of two to six trees on two sites in the vicinity of Cowichan Lake, Vancouver Is., British Columbia. Eleven excavation plots provided 36 trees which could be studied in pairs (a total of 50 pairs) in order to ascertain the...
Resource Type:: Masters Thesis
Full Text:: . Everett M Hansen and Dr. Lewis F. Roth who first sparked my interest in forest pathology and have helped

Incompatibility reactions and nuclear condition of three Phellinus species

Creator:: Hennon, Paul E.
Abstract:: Phellinus arctostaphyli (Long) Niemela, P. igniarius (L. ex Fr.) Quel., and P. tremulae (Bond.) Bond. et Boriss., heartrotting hymenomycetes in the family Hymenochaetaceae (Aphyllophorales), all conform to a multi-allelic heterothallic mating system. Both compatible and incompatible reactions result from pairings of homokaryons from the same basidiocarp. Homokaryons isolated from different...
Resource Type:: Masters Thesis
Full Text:: CONDITION OF THREE PHELLINUS SPECIES Abstract approved: Redacted for Privacy Everett M. Hansen Phellinus

ScholarsArchive@OSU

Biology of chlamydospores of Phytophthora ramorum

Morphological variation, taxonomy, and host specificity of Phytophthora megasperma

Environmental factors influencing the rate of spread of Phellinus weirii (Murr.) Gilbertson in young-growth Douglas-fir

Histological examination of Phytophthora ramorum in Notholithocarpus densiflorus bark tissues

Susceptibility of golden chinquapin (Chrysolepis chrysophylla) to Phytophthora cambivora

The infection and colonization of Douglas-fir needles by the Swiss needle cast pathogen, Phaeocryptopus gaeumannii (Rhode) Petrak

Trichoderma spp. : distribution in stumps infested with Phellinus weirii and growth and antagonism in vitro

Pathogenicity of Phytophthora species from Oregon waterways

Factors affecting inter-tree root contact and the transmission of Phellinus weirii in young-growth Douglas-fir

Incompatibility reactions and nuclear condition of three Phellinus species

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