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The biology and control of Phytophthora root and stem rot of apple rootstocks from stool beds

Creator:: Tidball, Carolyn Jean
Abstract:: The present studies were conducted to better understand the etiology, epidemiology and potential control of the Phytophthora stem root rot as it occurs in apple stool beds. Symptoms of Phytophthora root and stem rot occurred as early as May and continued to develop throughout the growing season. Sunken brown-black lesions...
Resource Type:: Masters Thesis
Full Text:: Identification of Species 19 Pathogenicity Tests 22 Fungicide Residual and Disease Control 25 Bioassay of

Pathogenic specialization and heterothallism in Sphaerotheca pannosa var. rosae

Creator:: Bender, Carol Lavane
Abstract:: Studies were conducted on pathogenic specialization and heterothallism in Sphaerotheca pannosa var. rosae, causal agent of rose powdery mildew. Methods were developed for isolation and identification of Sphaerotheca pannosa var. rosae races on rose. Monoconidial isolates were initiated on detached leaves, increased on host plants, and inoculated to rose cultivars...
Resource Type:: Masters Thesis
Full Text:: govern performance in a rootstock and a rose grown for floricultural purposes are quite different

Studies on viruses isolated from roses with rose mosaic symptoms

Creator:: Watson, Thomas Ray
Abstract:: Previous work on the rose mosaic virus has produced uncertainty concerning the identity and properties of this virus. This work was undertaken to help establish the true identity of the virus and to determine some of its properties. A mechanically transmissible virus associated with rose mosaic virus disease of Rosa...
Resource Type:: Masters Thesis
Full Text:: properties. A mechanically transmissible virus associated with rose mosaic virus disease of Rosa dilecta

Assays to determine tolerance of cherry rootstock to bacterial canker caused by Pseudomonas syringae pv. syringae

Creator:: Krzesinska, Elzbieta Z.
Abstract:: Bacterial canker, caused by Pseudomonas syringae pv. syringae is recognized as one of the greatest limiting factors in cherry production in Oregon. Disease incidence may be decreased when susceptible cultivars are high-grafted onto tolerant/resistant rootstocks. This research was begun to develop a rapid screening method which could be used to...
Resource Type:: Masters Thesis
Full Text:: usable criterion of the disease in this assay. 'Napoleon' and 'Corum' had significantly higher

Development of an in vitro and modification of an in vivo bioassay to screen cherry genotypes for response to inoculation with Pseudomonas syringae pv. syringae

Creator:: Roche, M. Margaret
Abstract:: The bacterium Pseudomonas syringae affects different crops worldwide. In the Willamette Valley of Oregon, P. syringae causes bacterial canker in sweet cherry, severely limiting its production. High grafting of susceptible sweet cherry cultivars to resistant rootstocks is practiced in the Willamette Valley to reduce incidence of this disease. The research...
Resource Type:: Masters Thesis
Full Text:: blossoms (Cameron, 1962). The bacterial canker disease cycle includes prominent winter and summer phases

Lodging control and yield enhancement in Morex spring barley with paclobutrazol treatment

Creator:: Morrison, Laura A.
Abstract:: Lodging in cereals can cause significant decreases in yield. It is both a problem in susceptible cereal cultivars with a tall-stemmed, weak-strawed growing habit and in lodging-resistant cereal cultivars when they are grown under high-nitrogen, high-moisture regimes. Plant growth regulators (PGR's) are chemical growth retardants that offer a method of...
Resource Type:: Masters Thesis
Full Text:: , irrigation, and pest 17 control. Plant breeders have already been successful in developing semidwarf

Status, distribution and seasonal variation of filbert aphid resistance to selected insecticides in the Willamette Valley, Oregon

Creator:: Katundu, Juma
Abstract:: Levels of resistance to six selected insecticides of eleven field populations of the filbert aphid Mvzocallis coryli (Goetze) were determined by using the leaf-dip residue technique. Test insecticides included compounds widely used in commercial filbert orchards, namely, carbaryl, diazinon, endosulfan, phosalone, fenvalerate and oxydemetonmethyl. Aphid samples were collected within a...
Resource Type:: Masters Thesis
Full Text:: , Painter and Jones 1958). Due to the presence of the pest complex described above and the need to reduce

Biology, distribution and economic threshold of the strawberry root weevil, Otiorhynchus ovatus (L.), in peppermint

Creator:: Cacka, Joseph Francis
Resource Type:: Masters Thesis
Full Text:: Biology 6 Control Strategies and Methods 7 Sampling 10 METHODS AND MATERIALS 12 Field Locations 12

Effects of growth-regulating treatments on eradication of PVX and PVS in potato shoot-tip culture

Creator:: Gallardo-Ramirez, Mirian
Abstract:: Four experiments were conducted to evaluate the effects of growth-promoting treatments on potato sprouts and plantlets grown in vitro, and to determine the relationships between growth rate and eradication of PVX and PVS through shoot-tip culture. The approach consisted of exposing plant material to potential growth-regulating treatments, selecting the more...
Resource Type:: Masters Thesis
Full Text:: % (Bawden and Kassanis, 1965); likewise, removing PVX and PVS from the cultivars Netted Gem and White Rose

On-farm inquiry and assessment of tillage and cover cropping for white mold control in snap bean production

Creator:: Harrison, Elizabeth Langham.
Abstract:: Cultural practices in snap bean production were evaluated at the Oregon State University Vegetable Research Farm Corvallis, Oregon. In addition, decision-making in snap bean production was assessed on five farms in the Coburg-Junction City-Harrisburg regions of the Willamette Valley, Oregon. A field experiment with cover crop and tillage techniques was...
Resource Type:: Masters Thesis
Full Text:: which fungicides would be most effective for disease control. Variety and row spacing Upright plant

ScholarsArchive@OSU

The biology and control of Phytophthora root and stem rot of apple rootstocks from stool beds

Pathogenic specialization and heterothallism in Sphaerotheca pannosa var. rosae

Studies on viruses isolated from roses with rose mosaic symptoms

Assays to determine tolerance of cherry rootstock to bacterial canker caused by Pseudomonas syringae pv. syringae

Development of an in vitro and modification of an in vivo bioassay to screen cherry genotypes for response to inoculation with Pseudomonas syringae pv. syringae

Lodging control and yield enhancement in Morex spring barley with paclobutrazol treatment

Status, distribution and seasonal variation of filbert aphid resistance to selected insecticides in the Willamette Valley, Oregon

Biology, distribution and economic threshold of the strawberry root weevil, Otiorhynchus ovatus (L.), in peppermint

Effects of growth-regulating treatments on eradication of PVX and PVS in potato shoot-tip culture

On-farm inquiry and assessment of tillage and cover cropping for white mold control in snap bean production

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