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Creator:: Beaver, Richard Gary, 1939-
Abstract:: Race identification of stripe rust (Puccinia striiformis West. ) is influenced by environment, pathogen variability and host age. Isolates of stripe rust were collected in the Pacific Northwest and characterized on two sets of differential varieties; the "Oregon" and the United States. Six of the seven isolates tested on the...
Resource Type:: Dissertation
Full Text:: . 49 10 Disease gradients in late summer inoculated wheat plots, 1969. 50 11 Disease gradients and

Creator:: Pfleger, Francis Louis
Abstract:: In vitro tests showed mycelial growth of Pyrenochaeta terrestris was inhibited by root and bulb extracts from the pink root resistant onion cultivar Nebuka, but not by extracts from the susceptible Southport White Globe. The active principle was shown to be fungistatic rather than fungicidal. It is present in both...
Resource Type:: Dissertation
Full Text:: organism Pyrenochaeta terrestris (Hansen) Gorenz, Walker and Larson. The disease is a 2 problem in

Creator:: Jatala, Parviz
Abstract:: Self-interactions (effects of reinoculation with the same nematode) in Meloidogyne hapla and Heterodera schachtii on Beta vulpris at different levels of inocula with various population combinations were studied. In M. hapla, the only significant increase of galls was noted in treatments when 250+250 larvae were inoculated at 10-day intervals. Longevity...
Resource Type:: Dissertation
Full Text:: microorganisms in the development of disease complexes have gained considerable attention and recognition in

Creator:: Rowe, Randall Charles
Abstract:: Footrot of wheat (Cercosporella herpotrichoides Fron) is a major disease of winter wheat in certain areas of the world having a cool, damp winter and early spring climate. In Oregon, it is an economic problem in the higher rainfall wheat-growing areas in the eastern portion of the state. This study...
Resource Type:: Dissertation
Full Text:: , initiation of infection and epidemic development of this disease. The activity of the fungus is strongly

Creator:: Huhtanen, Dianne Carol
Abstract:: Strawberry plants infected with June yellows and witches'-broom disease were grown in a mist chamber and treated with varying concentrations of oxytetracycline. Treatment with 50 ppm oxytetracycline produced phytotoxicity effects in strawberries infected with June yellows. However, treatment with 10 ppm oxytetracycline resulted in a significant (one percent level) increase...
Resource Type:: Masters Thesis
Full Text:: disease were grown in a mist chamber and treated with varying concen- trations of oxytetracycline

Creator:: Sisson, Warren Elmer, Jr.
Abstract:: Cambial activity was studied in trees infested by the balsam woolly aphid and in non-infested trees of grand and subalpine fir. Infested and non-infested samples of grand fir were collected near Corvallis during 1968 and 1969. Samples of subalpine fir, noninfested and infested, were collected near Odell Lake, at approximately...
Resource Type:: Dissertation
Full Text:: the DOCTOR OF PHILOSOPHY (Name) (Degree) in Botany and Plant Pathology presented on 44 /Of /97

Creator:: Ross, William David, 1937-
Resource Type:: Dissertation
Full Text:: the location and general nature of cell wall lignin are described for Douglas-fir bark. Fungal

Creator:: Chairez, Ruben and Chairez, Ruben, 1942-
Abstract:: Factors limiting effective extraction and purification of bean yellow mosaic virus (BYMV) were investigated. Since the use of published techniques for purifying BYMV resulted in low yields of partially purified virus, an improved method for partial purification of this virus was developed. The following treatments of infectious crude extract decreased...
Resource Type:: Dissertation
Full Text:: disease. Grogan and Walker (40) showed that this virus, called bean yellow mosaic virus, was a distinct

Creator:: McIntyre, John Lee
Abstract:: The fungus Verticillium dahliae Kleb. causes a wilt disease of peppermint, Mentha pipertita L. Propane flaming of peppermint stubble is widely used to control Verticillium wilt in the Willamette Valley of Oregon, but little is known about the temperature required for effective control of the fungus. The purposes of this...
Resource Type:: Masters Thesis
Full Text:: control the disease. Field experiments showed that tractor speeds of 2.0 and 2.5 mph at 35 psi gas

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