Author: Pamela Marie ColemanPublisher:
ISBN:
Category : Fungal diseases of plants
Languages : en
Pages : 272
Book Description
The Effect of Pink Root, Caused by Phoma Terrestris Hansen, on Yield of Onion (Allium Cepa L.)
Author: Pamela Marie ColemanPublisher:
ISBN:
Category : Fungal diseases of plants
Languages : en
Pages : 272
Book Description
A Study of the Pink-root Disease of Onion
Author: August Mark GorenzPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 168
Book Description
Etiology of the Pink Root Disease of the Onion (Allium Cepa, L.).
Author: Hans Nicholas HansenPublisher:
ISBN:
Category : Pink-root disease
Languages : en
Pages : 58
Book Description
Determination of the Inheritance of Resistance in the Onion, Allium Cepa L., to the Pink Root Fungus, Pyrenochaeta Terrestris
Author: Courtland Geoffrey NicholsPublisher:
ISBN:
Category : Onions
Languages : en
Pages : 168
Book Description
Pink Root Disease of Onions and Its Control in Texas
Author: Jacob Joseph TaubenhausPublisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 58
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.
The Effect of Bulb Size and Plant Density on Yield and Quality of Onion (Allium cepa var cepa L) Seed, at Ziway, Central Ethiopia
Author: Zerihun ZenaPublisher: GRIN Verlag
ISBN: 3656362009
Category : Technology & Engineering
Languages : en
Pages : 70
Book Description
Master's Thesis from the year 2008 in the subject Agrarian Studies, grade: 3.17, University of Hawassa (Awassa College of Agriculture), course: Horticulture, language: English, abstract: Plant density and bulb size trial was conducted at Ziway in order to identify the optimum agronomic management practices, which contribute to maximized seed production in onion crop both in terms of quantity and quality. The experiment was laid down in split plot design with three replications, keeping plant density as main plot factor and bulb size as sub plot factor. The effects were studied by collecting data on bulb sprouting and plant performance, yield components, seed yield and seed quality parameters. Analyses of variance, mean comparison using least significant difference, correlation analysis were made using SAS computer software. Plant density significantly influenced bulb sprouting, umbel size, seed yield per 100m2and germination percentage. The largest umbel size (4.9cm) was obtained from low plant density; where as the smallest (4.4cm) from high plant density. Maximum seed yield per 100m2(1,163,446 seeds) was collected from high density while low density yielded only 416,240 seeds per 100m2. However the quality of seed in terms of germination was highest for seeds obtained from low density. The influence of bulb size was significant on plant height, number of flower stalks per plant, number seeded florets per umbel, seed per plant, seed per 100m2, seed yield (qt/ha) thousand seed weight. Plants grown from large bulbs produced plants with best height (72.3cm), highest number of flower stalks (8.5), seeded florets per umbel (368.7), seed per plant (1,539), seeds per 100m2(994,434) and seed yield in qt/ha (10.42). Seeds with best thousand seed weight (4.2g) were obtained from medium bulbs and small bulbs performed least in all aspects. Correlation analysis was made to study the relationship among plant growth, yield component, seed yield and quality parameters and their respective influence on yield and yield quality. Positive correlation existed between plant height and umbel size with seeded florets per umbel; flower stalk per plant, plant height, umbel size, seeded florets per umbel and number of seeds per floret with seed yield per plant, which was highly correlated with seed yield (qt/ha). However, further studies ought to be conducted in order to understand clearly, why bulb size and plant density interaction effect was insignificant Key words: Plant density, bulb size, bulb sprouting, plant performance, seed yield and seed quality
Onion Seed Yield as Affected by Pink Root Disease, Soil Fumigation, Mother Bulb Fertilization and Bulb Size
Author: Ahmed Abu El Gasim AhmedPublisher:
ISBN:
Category :
Languages : en
Pages : 98
Book Description
Onions and Allied Crops
Author: H.D. RabinowitchPublisher: CRC Press
ISBN: 1351092057
Category : Technology & Engineering
Languages : en
Pages : 370
Book Description
First Published in 2018. Routledge is an imprint of Taylor & Francis, an Informa company.
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