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Powdery mildew (Podosphaera macularis Braun & Takamatsu) resistance in wild hop genetic resources

Creator:: Smith, Jodi M.
Abstract:: Hop powdery mildew, caused by Podosphaera macularis Braun & Takamatsu (formerly Sphaerotheca macularis (Wallr. :Fr.) Lind, syn. S. humuli (DC.)Burrill) was not observed in Pacific Northwest hop yards until 1997, when it was discovered in Washington. Within one year, it had spread to Oregon and Idaho. This emerging disease caused...
Resource Type:: Masters Thesis

The inheritance and nature of a symptomless infection by a Willamette strain of pea streak virus in Pisum sativum L.

Creator:: Tsai, Jean-duan
Abstract:: Pea streak virus (Marmor trifolii Holmes) is widespread and occasionally destructive in Eastern Oregon and Washington, and in many other pea growing areas. Since control by the use of insecticides to kill the insect vector is only partially successful, resistant varieties of peas are needed. In a study to confirm...
Resource Type:: Masters Thesis
Full Text:: titer, was needed. Because of the importance of the disease and observed deviations in the

Development, detection and elimination of Verticillium dahliae in mint shoot cultures and effects of bacterial cultures and bacterization on the growth and disease development

Creator:: Wang, Nan
Abstract:: Roots of greenhouse-grown peppermint (Mentha piperita L.) and spearmint (Mentha spicata L.) plants and in vitro-grown shoot cultures were inoculated with Verticillium dahliae conidial suspensions to study symptom development, detection, and elimination of the V. dahliae. There were significant differences in the symptom expression of control and infected shoot cultures...
Resource Type:: Masters Thesis
Full Text:: Bacterization on the Growth and Disease Development Abstract approved:' Barbara M. Reed Roots of greenhouse

The influence of antitranspirant and calcium sprays on calcium distribution and tipburn in cabbage (Brassica oleracea var. capitata) and lettuce (Lactuca sativa L.)

Creator:: Chen, Yung-Wu
Abstract:: Tipburn is a widespread physiological disorder of cabbage and lettuce, caused by calcium deficiency. Symptoms of tipburn are necrosis on margins of outer and inner head leaves in lettuce, whereas in cabbage it is only on margins of inner leaves. Tipburn on outer leaves may develop early, but symptoms remain...
Resource Type:: Masters Thesis
Full Text:: United States, in both field and greenhouse. Tipburn is also a serious disease in tropical and

Irrigation and plant density effects on head rot and yield of broccoli

Creator:: Ludy, Robin L.
Abstract:: Effects of amount of applied water and frequency of irrigation on head rot and yield of three broccoli cultivars were evaluated in 1987 and 1988. Two irrigation frequencies were established with a line-source sprinkler system for 5.5 weeks during heading. The low-frequency experiment was watered once per week and the...
Resource Type:: Masters Thesis
Full Text:: weather conditions. To date, no chemicals have provided adequate control of this disease and only

Genetic relationships between pea seedborne mosaic virus resistance and horticultural characteristics, powdery mildew, enation mosaic virus and red clover vein mosaic virus resistance in Pisum sativum L.

Creator:: Sewall, Cathy Hampshire
Resource Type:: Masters Thesis
Full Text:: LITERATURE CITED 72 LIST OF TABLES Table Page 1. Disease resistance and horticultural charac

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

Histological study of pear bark in relation to blight resistance

Creator:: McCormick, Andrew Cameron
Resource Type:: Masters Thesis
Full Text:: attention in this connection, and not only has the disease in question been studied, but its relation to

Screening Phaseolus cultivars for resistance to white mold disease caused by Sclerotinia sclerotiorum (Lib.) de Bary

Creator:: Kuehn, Michael
Resource Type:: Masters Thesis
Full Text:: to white mold in field and greenhouse tests. Measurements of disease reaction in field tests

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:: Cover Crop and Tillage Management on Disease Incidence and Sclerotia Degradation of Sclerotinia

ScholarsArchive@OSU

Powdery mildew (Podosphaera macularis Braun & Takamatsu) resistance in wild hop genetic resources

The inheritance and nature of a symptomless infection by a Willamette strain of pea streak virus in Pisum sativum L.

Development, detection and elimination of Verticillium dahliae in mint shoot cultures and effects of bacterial cultures and bacterization on the growth and disease development

The influence of antitranspirant and calcium sprays on calcium distribution and tipburn in cabbage (Brassica oleracea var. capitata) and lettuce (Lactuca sativa L.)

Irrigation and plant density effects on head rot and yield of broccoli

Genetic relationships between pea seedborne mosaic virus resistance and horticultural characteristics, powdery mildew, enation mosaic virus and red clover vein mosaic virus resistance in Pisum sativum L.

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

Histological study of pear bark in relation to blight resistance

Screening Phaseolus cultivars for resistance to white mold disease caused by Sclerotinia sclerotiorum (Lib.) de Bary

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

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