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The parasite complex of the pea aphid, Acyrthosiphon pisum (Harris) on alfalfa in western Oregon

Creator:: Dickie, Alfred Gordon
Abstract:: This study was initiated in the Spring of 1966 for the purpose of determining the present status and effectiveness of imported parasitic wasps of the pea aphid in the Willamette Valley of western Oregon. The pea aphid is a serious pest throughout the pea and alfalfa growing regions of the...
Resource Type:: Masters Thesis
Full Text:: pest throughout the pea and alfalfa growing sections of the United States and Canada. Plants attacked

Effects of the balsam woolly aphid (Adelges piceae (Ratzburg)) on the cambial activity of grand fir (Abies grandis (Dougl.) Lindl.) and subalpine fir (Abies lasiocarpa (Hook.) Nutt.)

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:: Activity of Grand Fir (Abies grandis (Dougl. ) Lindl.) and Subalpine Fir (Abies lasiocarpa (Hook.) Nutt

Time effect of wild oat removal on winter wheat yield

Creator:: Abu-Irmaileh, Barakat Eid Ahmad
Abstract:: The extent of the competitive effect of wild oats on winter wheat yield was estimated in field studies on three commercial wheat farms in the Willamette Valley. The morphological development of the wild oat plants was also documented. Wild oats were removed from stands of wheat in six different treatments;...
Resource Type:: Masters Thesis
Full Text:: three different growth stages, treatment with barban, continuous hand weeding, and barban plus

The influence of environment and pathogen variability on the infection of wheat by Puccinia striiformis West

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

The developmental cytopathology of Prunus persica Batsch. and P. avium L. infected with X-disease and Albino disease respectively

Creator:: Florance, E. R.
Abstract:: In 1967, Doi et al. proposed the hypothesis that 'yellows type diseases' are caused by mycoplasma. Since then more than 60 yellows diseases have been associated with mycoplasma-like bodies (MLB) (Maramorosch, 1973). The majority of these associations are based upon electron microscopic observations of mycoplasma-like bodies in situ. However, little...
Resource Type:: Dissertation
Full Text:: . and P. avium L infected with x-disease and albino disease respectively AN ABSTRACT OF THE THESIS OF

The partial purification-characterization of bean yellow mosaic virus

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

Treatment of June yellows and witches'-broom in strawberry with oxytetracycline

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

A compound from onion roots inhibitory to Pyrenochaeta terrestris

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

Factors affecting selective control of wild oat and downy brome in wheat by trifluralin

Creator:: Aldridge, Jack Clifton
Abstract:: Trifluralin (a, a, a - trifluoro -2, 6 -dinitro-N, N-dipropyl-ptoluidine) is effective in controlling downy brome (Bromus tectorum L.) and wild oat (Avena fatua L.) but does not severely affect the growth of wheat (Triticum aestivum L.). Studies were conducted using germination chamber and greenhouse facilities to investigate possible factors...
Resource Type:: Masters Thesis
Full Text:: Factors affecting selective control of wild oat and

Inactivation of Verticillium dahliae in peppermint stems by propane gas flaming

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

ScholarsArchive@OSU

The parasite complex of the pea aphid, Acyrthosiphon pisum (Harris) on alfalfa in western Oregon

Effects of the balsam woolly aphid (Adelges piceae (Ratzburg)) on the cambial activity of grand fir (Abies grandis (Dougl.) Lindl.) and subalpine fir (Abies lasiocarpa (Hook.) Nutt.)

Time effect of wild oat removal on winter wheat yield

The influence of environment and pathogen variability on the infection of wheat by Puccinia striiformis West

The developmental cytopathology of Prunus persica Batsch. and P. avium L. infected with X-disease and Albino disease respectively

The partial purification-characterization of bean yellow mosaic virus

Treatment of June yellows and witches'-broom in strawberry with oxytetracycline

A compound from onion roots inhibitory to Pyrenochaeta terrestris

Factors affecting selective control of wild oat and downy brome in wheat by trifluralin

Inactivation of Verticillium dahliae in peppermint stems by propane gas flaming

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