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Browsing Theses and Dissertations (Botany and Plant Pathology) by Issue Date

Browsing Theses and Dissertations (Botany and Plant Pathology) by Issue Date

Now showing items 21-40 of 198

Description and classification of the forests of the upper Illinois River drainage of Southwestern Oregon

Atzet, Thomas (1978-12-15)

The purpose of this study was to develope a plant community classification within the Siskiyou mountains, a small range within the Klamath geological province well known for its geologic and floristic diversity. Fores ...
Vegetative ecology of a montane mire, Crater Lake National Park, Oregon

Seyer, Susan C. (1979-12-14)
Effect of nutrient enrichment on marine benthic diatoms in Yaquina Bay, Oregon

Cardon, Nanette Clark (1981-05-18)

Sediment was fertilized with f/2 algal growth medium in situ and in the laboratory daily for one week. Sampling strategy incorporated two intertidal heights and two sites. Experiments were done in August and January. ...
Production dynamics of a Zostera marina L. bed in Netarts Bay, Oregon

Kentula, Mary E. (1982-09-13)
Plant communities of the grassy balds of Marys Peak, Oregon

Snow, Billy Douglas (1984-04-26)
Twenty-one years of secondary succession in Pseudotsuga forests of the western Cascade Range, Oregon

Halpern, Charles B. (1987-04-17)
Ecology and distribution of riparian vegetation in the Trout Creek Mountains of southeastern Oregon

Evenden, Angela G. (1989-06-22)
Effects of substrate relief, light intensity and herbivory on the distribution and abundance of periphyton in laboratory streams

DeNicola, Dean M. (1990-04-26)
Population dynamics, extraction, and response to nematicide of three plant parasitic nematodes on peppermint (mentha piperita L.)

Merrifield, Kathryn J. (1990-06-04)

The efficiencies of wet sieving/sucrose centrifugation (WS/SC) recovery of Pratylenchus penetrans (59 %), Paratylenchus sp., (80 %), and Criconemella xenoplax (66 %) were established. Baermann funnels (BF) recovered ...
Biology, epidemiology, and biological and chemical control of Phytophthora vignae

Fernando, W. Gerard Dilantha (1990-10-04)

Phytophthora vignae, causal agent of stem and root rot of cowpea (Vigna unguiculata), was reported for the first time in Sri Lanka. The pathogen was found in cowpea field soils from 3 of 5 geographic regions sampled. ...
Organic pesticide modification of the species interactions in an annual plant community

Pfleeger, Thomas G. (1990-10-12)
Variation in plant response to inoculation with different isolates of vesicular arbuscular mycorrhizal fungi

Ianson, David C. (1990-12-21)
Response to fenamiphos, extraction techniques and population dynamics of Pratylenchus penetrans on western Oregon red raspberry

Lolas, Mauricio (1991-03-15)

The effects of fenamiphos on soil and root populations of Pratylenchus penetrans were evaluated in four red raspberry cv. Willamette fields in Northwestern Oregon. Field 1 was a silty clay loam with 53% organic matter ...
Development of in vitro lily scale budlets as related to virus elimination

Ruttum, Joanne C. (1991-06-27)

Lily hybrids vary in their ability to produce virus-free (VF) bulblets when grown from virus-infected scales in tissue culture. Asiatic hybrids typically produce a higher percentage of in vitro VF scale bulblets than ...
Effects of intercropping beans with maize on angular leaf spot and rust of beans

Boudreau, Mark Alan, 1958- (1991-09-13)

Experiments were performed to determine the nature of maize influence on bean disease in additive-type intercrops. Overall effects of intercrops on angular leaf spot (caused by Phaeoisariopsis griseola) in Kenya indi ...
Interactive effects of stripe rust and plant competition in heterogeneous wheat populations

Finckh, Maria Renate (1991-10-25)

Disease has been implied as an important selective force acting in plant populations. This study was conducted to determine the effects of stripe rust (Puccinia striiformis) on the population dynamics of wheat (Tritic ...
Effect of resident epiphytic fungi development of brown rot blossom blight of stone fruits

Wittig, Hans P. P. (1992-01-14)

Antagonistic effects of Epicoccum purpurascens, Aureobasidium pullulans, Trichoderma spp., and Botrytis cinerea on establishment of Monilinia fructicola infections in cherry and peach blossoms were assessed in field a ...
Mycorrhizal fungi and their relationship to plant succession in subalpine habitats

Cazares, Efren (1992-01-15)
Systematic and reproductive studies of Mimulus (Scrophulariaceae) in the Pacific Northwest : implications for conservation biology

Meinke, Robert James (1992-05-08)

The Mimulus washingtonensis complex is a group of morphologically similar species centered in the Pacific Northwest. All are rare, and most are under consideration for listing as endangered. Morphometric and pollinatio ...
Mycorrhizal and other root endophytic fungi of lupines in the Pacific Northwest

O'Dell, Thomas E. (1992-05-12)

We investigated the root endophytic fungi of lupine using four approaches: (1) occurrence of fungal colonization in field-collected roots; (2) growth response of L. latifolius to inoculation with two types of fungi; ( ...