Author: Martin Michael KulikPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 252
Book Description
Studies on Pink Root of Onions and Shallots and the Casual Organism Pyrenochaeta Terrestris (Hansen) Gorenz, Et. Al
Author: Martin Michael KulikPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 252
Book Description
Antibiosis in Relationship to Pink Root of Onions and Shallots Incited by Pyrenochaeta Terrestris (Hansen) Gorenz Et Al
Author: Thomas Edward FreemanPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 108
Book Description
Factors Influencing the Development of Onion Pink Root Disease Incited by Pyrenochaeta Terrestris (Hansen) Gorenz, Walker, Larson
Author: Paul Eugene PackPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 184
Book Description
A study was conducted of the influence of various climatic and soil factors on the development of onion pink root disease and of the influences of temperature, light, pH, carbon and nitrogen sources, and vitamins on the growth in vitro of an Oregon isolate of the pink root fungus, Pyrenochaeta terrestris (Hansen) Gorenz, Walker, Larson. Eleven onion lines were planted in eastern and western Oregon to determine whether the relative resistance to pink root among them would vary during the growing season and with different climatic conditions. Varietal resistance remained generally stable among the different lines. Ten onion lines were grown in mucky peat and silty clay loam soils in the greenhouse to determine the influence of soil moisture and soil type on severity of pink root. Onions grown in soil held at field capacity had less pink root than those in dryer soils. Pink root ratings were similar among onions grown in both soils. Lanstan, Vorlex, Telone, Pictel, Morton Soil Drench, SD 345, chloropicrin, Mumfume, Phaltan, E.P. 230, and E.P. 201 were tested in the field for their effect on pink root. In some fields Vorlex, chloropicrin, Mumfume, E.P. 230, and E.P. 201 increased onion yields from 30 to 75 percent. None of these fumigants noticeably reduced pink root, however. Telone controlled stubby root nematode infection but did not reduce pink root. On malt extract-yeast extract agar P. terrestris grew fastest at a temperature of 30 C, with the greatest increase in growth rate between 15 and 20 C. There was no growth at 5 C. Continuous light, alternating darkness and light, and brief exposures to germicidal ultraviolet light (2,500 A[superscript °]) did not noticeably affect the growth rate of the fungus. Growth of P. terrestris increased the pH of glucose-asparagine and sucrose-potassium nitrate liquid media. On both media the fungus grew well over a pH range from 6 to above 8 but poorly at a pH of 4 or less. Sorbose inhibited growth of P. terrestris. Maltose, galactose, glucose, fructose, sucrose, lactose, and starch in asparagine liquid and agar media each supported good growth of the fungus, as did glycine, potassium nitrate, and urea in glucose agar. The addition of thiamine, biotin, inositol and pyridoxine to sucrose -asparagine agar did not noticeably affect P. terrestris growth. Higher temperatures coincided with greater pink root infection in the field.
A Study of the Pink-root Disease of Onion
Author: August Mark GorenzPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 168
Book Description
Bibliography of Agriculture
Author: Dissertation Abstracts
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 926
Book Description
Abstracts of dissertations and monographs in microform.
Screening Technique for Onion Pink Root (Pyrenochaeta Terrestris (Hans) Gorenz, Walker and Larson.) Resistance
Author: Jaime Iglesias-OlivasPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 120
Book Description
Pink Root of Onion Caused by Pyrenochaeta Terrestris
Author: Wilford M. HessPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 144
Book Description
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1248
Book Description
The Identification and Quantification of Pyrenochaeta Terrestris (Hansen) Gorenz, Walker, and Larson, Propagules in Soil and Onion Roots
Author: James Ernest FlotaPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 72
Book Description