Plant Pathology Commons^™

Growth Of The Fungus, Verticillium Albo-Atrum In Resistant And Non-Resistant Strains Of A Tomato Variety And Its Effect On Plant Growth, Robert M. Zundel

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Verticillium wilt, caused by the fungus, Verticillium albo-atrum, is a destructive disease of tomatoes in many areas. Due to the seriousness of this problem, Cannon and Waddoups (1) have developed resistance to this disease in some commercial varieties grown in Utah.

Application Of Paper Electrochromatography To Isolation Of Tobacco Mosaic Virus, Bertram E. Bordewick

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Importance of the problem

The complete study of a virus disease often reaches a stalemate because of failure to isolate the virus itself in a purified form. Methods in current use, such as ultracentrifugation, precipitation, fractionation, and spectroscopic analysis, have in some cases proved successful in virus purification work. Frequently these techniques have not proved satisfactory, particularly with phloem-type viruses which are not mechanically transmitted. This investigation was undertaken to determine the possibility of isolating these and other viruses by electrochromatography.

Studies Of The Dodder Transmission Of The Western-X Virus From Peach To Herbaceous Plants, Lewis G. Weathers

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Western-X disease is considered to be the most serious and destructive virus disease affecting peaches in the northwestern United States. The virus causing this disease in peach also infects chokecherries and most varieties of sweet and sour cherries. There is also evidence (13) that certain varieties of plums and apricots are susceptible. No information now exists to indicate that the virus occurs in plants outside of the genus Prunus. It is found that woody plants such as stone fruit trees are not particularly favorable plants for studying the virus. All attempts to isolate the western-X virus from woody tissue …

The Inheritance Of Resistance To Verticillium Wilt In Tomato, Lester Schaible

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Verticillium wilt of tomatoes is caused by Verticilium albo-atrum and is one of the most destructive diseases of tomatoes in Utah, California, Oregon, and Washington. Control methods thus far devised have proved to be either ineffective or too expensive.

An Etiological And Host Range Study Of Celery Mosaic In Utah, Dennis H. Hall

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Celery mosaic is a virus disease of major economic importance in Utah. In years of severe epiphytotics, it has been a limiting factor in celery production. In 1947 losses due to this disease were estimated to exceed 8 per cent of the total crop. This estimate does not include losses resulting from reduction in grade or from plants discarded in the packing sheds. The celery acreage in Utah dropped from a high of 950 acres in 1946 to 750 acres in 1947 and dropped again in 1948 to 420 acres. Leaders in the industry attributed this reduction in acreage, in …

A Study Of The Physiology Of Grape Roots And Stocks In Relation To A Lime-Induced Chlorosis, Eldrow Reeve

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The word chlorosis comes from the Greek "chloros" meaning light green and is used by plant science workers to designate a disease of plants, the characteristic symptom of which is the yellowing of the leaves.