Download or read book The Inheritance of Stem Rust Puccinia Graminis Graminicola Resistance in Perennial Ryegrass Lolium Perenne written by Crystal A. Rose and published by . This book was released on 1985 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three stem rust Puccinia graminis graminicola, resistant sources of perennial ryegrass, Lolium perenne, 4A, 48A, and 77A, were crossed in a partial diallel design with one susceptible source, MP-2, resulting in six crosses excluding reciprocals. The F1's and cloned parental populations were inoculated in the field and rated on a stem rust scale of 1-9 with 9 best (immune), once a week for five weeks. Maturity stage ratings of 1-6 with 1 during the vegetative stage and 6 at full maturity were also taken once a week. Maturity stages were not highly correlated with stern rust reactions except during the bootstage and early anthesis. Genetic differences were found between parental sources for stem rust reactions. Frequency distributions based on stem rust reactions among the F1 progeny populations suggested that resistance was quantitatively inherited with minor and possibly some major genes acting in an additive manner. Transgressive segregation toward susceptibility and slow rusting types were evident. Broad sense heritability estimates for stem rust resistance varied depending on the particular cross. The estimates suggested that there is considerable genetic variability for resistance between the parental lines. Selection would be more effective in the bootstage stage prior to anthesis when the heritability estimates were found to be higher. As the inoculum increased in the later stages of plant development, the resistance appeared to be overcome by the spore load. Seedling stem rust reactions were found to differ from adult plant reactions in the F1 generations of the six crosses in this study. In the F2 generation with open pollination of the F1 parents a gradient of percent susceptible seedlings occurred. Results of this study indicate a potential for developing stem rust resistant varieties with several minor and some major genes for increased longevity of resistance.
Download or read book The Inheritance of Resistance and Susceptibility to Puccinia Graminis Tritici in a Cross Between Federation Wheat and Khapli Emmer written by Harold John Hynes and published by . This book was released on 1925 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Overwintering Survival of Stem Rust on Perennial Ryegrass written by Tyler C. Gordon and published by . This book was released on 2011 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stem rust, caused by the fungus Puccinia graminis subsp. graminicola, can cause yield reductions exceeding 90% on perennial ryegrass (Lolium perenne L.) crops grown for seed if not treated with fungicide in the spring. There is evidence that late-spring stem rust epidemics are initiated by populations that survived the winter. In addition, a previously developed stem rust severity model indicates that the late-spring epidemic severity is proportional to the stem rust population that overwintered. In this study, a mathematical model was constructed to describe the biological processes of stem rust overwintering as a function of meteorological conditions. The model was validated with two years of stem rust severity data collected at two field sites. After model validation, the effects of changing the sporulation or daily infection conditions on overwintering stem rust foci were quantified. The model indicated that reducing the infection conditions or sporulation rate over the winter would reduce the stem rust population in the spring. A mycoparasite of stem rust, Sphaerellopsis filum (Biv.-Bern ex Fr.) Sutton (teleomorph Eudarluca caricis (Fr.) Eriksson), is known to infect the uredinia of other rust species and to lower spore production capacity. The effects of S. filum on individual stem rust uredinia and on overwintering populations were quantified. S. filum and stem rust were inoculated under controlled conditions in the glasshouse. In the field, S. filum was applied to plots that were naturally infected with stem rust at two sites in two years. S. filum infected stem rust uredinia in the glasshouse and field under conditions typical of an Oregon winter, and reduced spore production capacity. Furthermore, winter applications of S. filum or one winter application of a fungicide reduced the stem rust overwintering population at several field sites on first-year stands of perennial ryegrass. Treatment effects were not observed on second-year stands of perennial ryegrass, which had lower levels of disease severity than first-year stands during both years. These studies suggest several IPM strategies that could be utilized to reduce the severity of stem rust epidemics on perennial ryegrass. These strategies might include lowering the spore production capacity of stem rust by introducing effective strains of S. filum, or applying a fungicide to first-year stands over the winter.
Download or read book Inheritance of Resistance to Stem Rust Puccinia Graminis F Sp Tritici Race QCC in Barley Hordeum Vulgare written by David Gerald LeGare and published by . This book was released on 1996 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Inheritance of Resistance to Stem Rust Puccinia Graminis Tritici in Crosses of Triticum Aestivum Vars Lee X Idaed Lee X Lemhi Red Egyptian X Idaed and Red Egyptian X Lemhi written by Hyrum Gardner Johnson and published by . This book was released on 1955 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agronomy Abstracts written by and published by . This book was released on 1985 with total page 1238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).
Download or read book Golf Course Management Construction written by James C. Balogh and published by CRC Press. This book was released on 2020-10-25 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt: Golf Course Management & Construction presents a comprehensive summary and assessment of technical and scientific research on the environmental effects of turfgrass system construction and maintenance. Although the book focuses on golf courses, it also discusses turfgrass systems for residential and commercial lawns, parks, and greenways. The book is an excellent introduction to the concepts of nonpoint source environmental impacts of turfgrass management for turfgrass scientists and specialists, landscape and golf course architects, turfgrass system and golf course developers, golf course superintendents, environmental scientists, and land-use regulators.
Download or read book Microbiology Abstracts written by and published by . This book was released on 1986 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Australian Journal of Agricultural Research written by and published by . This book was released on 1997 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Agricultural Index written by and published by . This book was released on 1986 with total page 2476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Breeding and Seed Science written by and published by . This book was released on 2003 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pasture and Forage Crop Pathology written by Sukumar Chakraborty and published by . This book was released on 1996 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Applied Seed Production written by and published by . This book was released on 1990 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turfgrass written by Donald V. Waddington and published by . This book was released on 1992 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Section I. the turfgrass industry: Turfgrass science-Historical overview, the turfgrass industry, Artificial turf; Section II. turfgrass physiology, Ecological aspects of turf communities, Energy relations and carbohydrate partitioning in turfgrasses, Salinity and turfgrass culture, Physiological effects of temperature stress, Shade and turfgrass culture, Effects of traffic on turfgrass; Selection III. soils and water: Soils, soil mixtures, and soil amendments, Nutricional requirements and fertilization, Water requirements and irrigation; Section IV. management: Energy conservation and efficient turfgrass maintenance; Integrated pest management, Turfgrass management operations, Plant growth regulators and turfgrass management; Section V. research methods:Field research, Controlled environment research methods for turs, Research methods and approaches to the study of diseases in turfgrasses,Methods of research in turfgrass entomology, Turfgrass weed science research methods, Breeding improved turfgrasses.
Download or read book Biotechnology Research Abstracts written by and published by . This book was released on 1986 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monthly. Classified listing of references to worldwide articles dealing with all aspects of biotechnology. Also includes books and conferences. Each entry gives bibliographic information, institutional address of author(s), and abstract. Author and subject index.
Download or read book Bulletin Organisation Internationale de Lutte Biologique Contre Les Animaux Et Les Plantes Nuisibles Section Regionale Quest Pal arctique written by and published by . This book was released on 1993 with total page 1288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Breeding Abstracts written by and published by . This book was released on 1992-08 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
