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The application of mathematical models in the epidemiology of foot rot of wheat caused by Cercosporella herpotrichoides Fron.

Creator:: McCoy, Mary Lois
Resource Type:: Dissertation
Full Text:: root rot of bean was sup- pressed in different soils and that this suppressive factor was micro

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:: were incorporated into a model for spread of laminated root rot. The goal of the spread model is to

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:: fungus, Phellinus weirii (Murr.) Gilb., causes laminated root rot, a destructive disease of conifers in

Genetics of sexuality and population genetics of Phellinus weirii

Creator:: Angwin, Peter A.
Abstract:: Phellinus weirii (Murr.) Gilbertson, cause of laminated root and butt rot, is a heterothallic basidiomycete lacking clamp connections. Two biological species groups of the fungus have been hypothesized, the Douglas-fir and cedar-types, on the basis of physiological, morphological and epidemiological differences. Single-spore and vegetative isolates differ in cultural morphology, nuclear...
Resource Type:: Dissertation
Full Text:: , cause of laminated root and butt rot, is a heterothallic basidiomycete lacking clamp connections. Two

Distribution and variation of Armillariella mellea clones in relation to vegetative cover and severity of root rot in Ponderosa pine

Creator:: Cooley, Sally Joan
Abstract:: Root rot due to Armillariella mellea (Vahl. ex Fr.) Karst. is unusually severe in ponderosa pine near Glenwood, Washington. Isolate relations, clonal variability, vegetation patterns, and climate were examined in relation to severity of disease in this area. Ninety-one isolates from 70 infection centers were examined. Pairings of neighboring isolates...
Resource Type:: Masters Thesis
Full Text:: in relation to vegetative cover and severity of root rot in Ponderosa pine AN ABSTRACT OF THE

Forecasting Pseudocercosporella herpotrichoides foot rot of winter wheat

Creator:: Grybauskas, Arvydas P.
Abstract:: The use of fungicides for the control of foot rot of winter wheat, caused by Pseudocercosporella herpotrichoides (Fron) Dei., requires a forecast of disease risk to optimize this management practice ecologically and economically. Foot rot occurs in both the mild, wet (100+ cm, ppt./year) annual cropped areas in western Oregon,...
Resource Type:: Dissertation
Full Text:: since at least 1919 as one of the organisms in a disease complex reported to cause a foot and root rot

Tree vigor and the susceptibility of Douglas-fir to armillaria root disease

Creator:: Rosso, Pablo H.
Abstract:: The main objective of this thesis was to determine the influence of tree vigor on susceptibility to Armillaria root disease. First, the effect of thinning, fertilizing and pruning on tree vigor of four young Douglas-fir (Pseudo tsuga menziesii var. menziesi,) plantations was explored. Tree vigor was calculated by measuring wood...
Resource Type:: Masters Thesis

Effects of Phellinus weirii on plant community composition and succession of mature and old-growth Douglas-fir forests

Creator:: Holah, Jennifer C.
Abstract:: Disease is often overlooked as a natural disturbance agent in plant communities. This study examines what effects, if any, a disease-mediated disturbance has on the plant community as a whole in old-growth and mature forests of western Oregon. Phellinus weirii (Murrill) Gilbertson (Family: Hymenochaetaceae) is a native root-rotting pathogen that...
Resource Type:: Masters Thesis

Sweet corn decline syndrome in Oregon's Willamette Valley

Creator:: Hoinacki, Elisabeth V.
Abstract:: For the past several years vegetable growers in Oregon's Willamette Valley have experienced reduced yields in their sweet corn plantings. We conducted studies to 1) describe the symptomology and etiology of the disease, 2) test a root rot rating system we developed to evaluate factors in the disease syndrome, and...
Resource Type:: Dissertation
Full Text:: ) test a root rot rating system we developed to evaluate factors in the disease syndrome, and 3

ScholarsArchive@OSU

The application of mathematical models in the epidemiology of foot rot of wheat caused by Cercosporella herpotrichoides Fron.

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

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

Genetics of sexuality and population genetics of Phellinus weirii

Distribution and variation of Armillariella mellea clones in relation to vegetative cover and severity of root rot in Ponderosa pine

Forecasting Pseudocercosporella herpotrichoides foot rot of winter wheat

Tree vigor and the susceptibility of Douglas-fir to armillaria root disease

Effects of Phellinus weirii on plant community composition and succession of mature and old-growth Douglas-fir forests

Sweet corn decline syndrome in Oregon's Willamette Valley

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