Index Catalog // ScholarsArchive@OSU

A revision of the Macrocheles glaber species group (Acari: Macrochelidae) using phylogenetic systematics

Creator:: Walter, David Evans, 1950-
Abstract:: The Macrocheles glaber species group contains many of the common mites which are associated with the dung of domestic animals. Species in the glaber group have been investigated for their use as biological control agents of synanthropic flies. Over 10,000 slide-mounted specimens of Macrocheles in the OSU Acarology Collection and...
Resource Type:: Dissertation

Biological control of spider mites by the predatory mite Neoseiulus fallacis (Acari: Phytoseiidae) in ornamental nursery systems

Creator:: Pratt, Paul D.
Abstract:: We identified and evaluated a phytoseiid predator as a biological control agent of multiple spider mites pests that occur in ornamental nurseries. When comparing species, Neoseiulus fallacis (Garman) had a wider prey range than Galendromus occidentalis (Nesbitt), a higher probability of overwintering than Neoseiulus califomicus McGregor and was equally or...
Resource Type:: Dissertation

Exploiting Hordeum vulgare subsp. spontaneum genetic resources : diversity analysis and germplasm development

Creator:: Matus, Iván Ariel
Abstract:: Wild barley (Hordeum vulgare subsp. spontaneum) could be a source of useful genes for improving cultivated barley. The useful genes present in Hordeum vulgare subsp. spontaneum may be new alleles at described loci, or these may be entirely new genes in the sense that there is limited allelic variation at...
Resource Type:: Dissertation

Resistance mechanisms of Port-Orford-cedar to Phytophthora lateralis

Creator:: Oh, Eunsung
Abstract:: Breeding Port-Orford-cedar for resistance to Phytophthora lateralis, a causal agent of root disease, begins by screening, through artificial inoculation, phenotypically resistant trees selected from natural stands. The successful program selected tolerant or resistant POC parent trees for the purpose of disease management. Candidate resistant POCs were used in my dissertation...
Resource Type:: Dissertation

RFLP analyses of interspecific hybrids of Phaseolus

Creator:: Kuo, Mei
Abstract:: Gene transfer via interspecific hybridization within Phaseolus has been limited by abnormal hybrid development and the rapid loss of hybridity in subsequent generations. The most advanced embryo development occurs in P. vulgaris x P. coccineus where mature seeds form. However, the reciprocal cross still results in abnormal embryos unable to...
Resource Type:: Dissertation

Influence of photosynthesis and carbohydrates on adventitious root formation by leafy cuttings

Creator:: Davis, Tim D.
Abstract:: Many investigators have suggested that current photosynthate supply can limit adventitious root formation on leafy cuttings. Accordingly, studies were undertaken to determine the effects of altering photosynthesis and carbohydrate levels on adventitious root formation by leafy cuttings of a number of different species. Pea cuttings rooted at high CO₂ (1800...
Resource Type:: Dissertation

Sugar uptake, fruit growth and carbon partitioning in the strawberry

Creator:: Forney, Charles F.
Abstract:: Sinks, plant organs which depend on the import of assimilates for growth, play a central role in determining assimilate distribution patterns within the plant. The strawberry fruit is a strong sink for dry matter and its effect on carbon partitioning and assimilation in the plant as well as the mechanism...
Resource Type:: Dissertation

Competitive effects of overtopping vegetation on Douglas-fir morphology in the Oregon Coast Range

Creator:: Chan, Samuel S.
Abstract:: The response of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) saplings to various levels of brush overtopping when growing on three north-facing sites in the Oregon Coast Range was investigated for two consecutive years. A fisheye (hemispherical) photographic technique combined with a digitizing computer system was used to determine the percentage of...
Resource Type:: Masters Thesis

Prescribed fire in Eastern Oregon ponderosa pine forests : relationships between soil fertility and ecology

Creator:: Grossmann, Emilie B.
Abstract:: I conducted two separate studies, both related to the impacts of spring and fall prescribed fire on ponderosa pine (Pinus ponderosa Dougl. ex Loud.) forest soils in Eastern Oregon. The studies were either conducted at or linked to four stands of ponderosa pine, in the Malheur National Forest. Each stand...
Resource Type:: Masters Thesis

Identifying candidate genes associated with cold adaptation in Douglas-fir using DNA microarrays

Creator:: Howe, Dana Kathryn
Abstract:: In forest trees from temperate and boreal regions, cold acclimation is an important adaptive trait that involves changes in gene expression and physiology. Genecological, quantitative genetic, and QTL studies have been used to study the genetics of cold acclimation in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), but the genes responsible for...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

A revision of the Macrocheles glaber species group (Acari: Macrochelidae) using phylogenetic systematics

Biological control of spider mites by the predatory mite Neoseiulus fallacis (Acari: Phytoseiidae) in ornamental nursery systems

Exploiting Hordeum vulgare subsp. spontaneum genetic resources : diversity analysis and germplasm development

Resistance mechanisms of Port-Orford-cedar to Phytophthora lateralis

RFLP analyses of interspecific hybrids of Phaseolus

Influence of photosynthesis and carbohydrates on adventitious root formation by leafy cuttings

Sugar uptake, fruit growth and carbon partitioning in the strawberry

Competitive effects of overtopping vegetation on Douglas-fir morphology in the Oregon Coast Range

Prescribed fire in Eastern Oregon ponderosa pine forests : relationships between soil fertility and ecology

Identifying candidate genes associated with cold adaptation in Douglas-fir using DNA microarrays

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