Download or read book Germplasm Enhancement and Improvement of Evaluation Methodology for Barley Yellow Dwarf Disease in Winter Wheat written by Ellen M. Bauske and published by . This book was released on 1992 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progeny from three cycles of a modified recurrent selection scheme were field tested to determine the effectiveness of this strategy for improving tolerance to barley yellow dwarf virus (BYDV-PAV-IL) in a winter wheat population. Symptom severity was not reduced by the selection scheme. The percentage yield of the control was unaffected by the selection scheme. Little genetic variability of symptom expression was detected in the three cycles and the parent population. The effects of initial dosage of BYDV on symptom expression in spring oats and winter wheat was determined. Zero to 126 Rhopalosiphum padi vectoring BYDV-PAV-IL were placed on four oat and four wheat cultivars. At an early disease evaluation all oat cultivars showed a linear response to increasing dosage. At a later disease rating, the response of Don, Hazel, and Ogle was curvilinear, suggesting a threshold of approximately 54 aphids/hill. IL86-5262 had a linear response at the late evaluation. Yield of Hazel and Ogle was unaffected by increasing dosage. The wheat cultivars Abe and Cardinal responded linearly at early evaluation while the response of Caldwell was curvilinear with a threshold of 90 aphids/hill. Yield was affected similarly. No dosage effects were detected on Abe. In wheat cultivars symptom expression at heading was unaffected by dosage. The results of seven uniformity trials on two brands of microplates, with two monoclonal triple-antibody-sandwich ELISA systems done by two operators indicate that absorbance values were affected by plate brand and operator technique. Several arrangements of 48 treatments with two replications were imposed on the plates. When replications of a treatment were paired in either rows or columns, differences between treatment means were confounded with row and column differences found on the plates, indicating the need for an experimental design. Both the randomized complete block (RCB) design and the alpha (0,1) one restrictional resolvable incomplete block design (alpha design) allowed for more precision than the completely randomized design. The alpha design was more effective than the RCB design.
Download or read book Evaluation of Barley Yellow Dwarf Virs Under Conservation Tillage Practices in Winter Wheat written by Jocelyn L. Smith and published by . This book was released on 2006 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1998 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Progress at the Illinois Agricultural Experiment Station written by University of Illinois at Urbana-Champaign. Agricultural Experiment Station and published by . This book was released on 1992 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1993 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Barley Yellow Dwarf of Winter Wheat written by Gordon Lee Cisar and published by . This book was released on 1980 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Progress in Solving Some Farm Problems of Illinois written by University of Illinois at Urbana-Champaign. Agricultural Experiment Station and published by . This book was released on 1992 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Assessment of the International Spring X Winter Wheat Germplasm Enhancement Program at Oregon State University written by Robert George Mason and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Cyber age Approach for Global Management of Barley Yellow Dwarf Virus in Winter Wheat written by Joseph Walls and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Precision agriculture often uses computer-based decision-support systems (DSS's) to disseminate pest and disease information to growers to more efficiently manage agricultural productions. In this thesis, a DSS is developed to be accessed by growers for management of barley yellow dwarf disease caused by Barley yellow dwarf virus. The disease devastates grain growing regions around the world in epidemic patterns. It is a well-studied disease, but management can be greatly improved with determination of necessity and optimal timing of insecticide-treated seed, planting date, pest scouting, and foliar insecticide spray treatments, in chronological order. Using published literature and interviews with experts in BYDV epidemiology and agricultural decision-making, dependency networks were used to model field conditions that would logically warrant these management actions. The networks represented nine possible outputs: use insecticide-treated seed, use untreated seed, plant crop immediately, delay planting, scout for aphid vectors of BYDV, do not scout, full foliar insecticide spray, 1/2 (diluted) insecticide spray, and no insecticide spray. There were a total of 243 total combinations of conditions to reach the seed treatment recommendations, 9,720 to reach the planting date recommendations, 62,208 to reach the scouting recommendations, and 216 to reach the insecticide spray recommendations. In this work, I consider and strive to improve the mechanism for inferring output recommendations even when using only partial data sets.Inference mechanisms are necessary components of DSS's to extrapolate outputs from input data to give users recommendations. The dependency networks represent inference mechanisms that require all input information be present before a management recommendation can be made. This thesis proposes a novel secondary inference mechanism structure to be overlaid onto the dependency networks that uses a numerical, rather than categorical or ordinal, calculation system to handle partial input information. This inference mechanism used the dependency networks as a template to make a prototype numerical representation of importance of field conditions in making management decisions. Secondly it calculates a likely success of these management decisions when executed, and penalizes the grower if he or she executes an incorrect management tactic. The success or penalties are measured in terms of optimum yield. It is also proposed that this secondary inference mechanism can allow a BYD management decision forecast based on pest and disease statuses, as well as real-time recommendations. The purpose of the DSS developed in this thesis is to show the applicability of implementing DSS's based on expert knowledge into a platform (iPIPE) that is capable of gathering data from users in a two-way feedback loop. Since future management decisions rely on previous ones the feedback loop allows management practices conducted by the grower to alter future management recommendations given by the system. It also enhances large scale (regional) pest monitoring with input of individual field data. The DSS reported in this thesis will serve as a basis for the evolution of precision management of crop diseases. It will aid in reducing input cost and increasing sustainability and cereal grain yield in BYD management and eventually it will serve as model to better manage other crop pests and diseases.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agriculture Rural Development and Related Agencies Appropriations for Fiscal Year 1997 Commodity Futures Trading Commission written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Agriculture, Rural Development, and Related Agencies and published by . This book was released on 1996 with total page 1452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agriculture Rural Development and Related Agencies Appropriations for Fiscal Year 1997 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Agriculture, Rural Development, and Related Agencies and published by . This book was released on 1996 with total page 1614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1993 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Managing Global Genetic Resources written by National Research Council and published by National Academies Press. This book was released on 1993-02-01 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: This anchor volume to the series Managing Global Genetic Resources examines the structure that underlies efforts to preserve genetic material, including the worldwide network of genetic collections; the role of biotechnology; and a host of issues that surround management and use. Among the topics explored are in situ versus ex situ conservation, management of very large collections of genetic material, problems of quarantine, the controversy over ownership or copyright of genetic material, and more.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1992-06 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Barley written by Steven E. Ullrich and published by John Wiley & Sons. This book was released on 2011-01-25 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: Barley is one of the world's most important crops with uses ranging from food and feed production, malting and brewing to its use as a model organism in molecular research. The demand and uses of barley continue to grow and there is a need for an up-to-date comprehensive reference that looks at all aspects of the barley crop from taxonomy and morphology through to end use. Barley will fill this increasing void. Barley will stand as a must have reference for anyone researching, growing, or utilizing this important crop.
Download or read book Crop Improvement written by Khalid Rehman Hakeem and published by Springer Science & Business Media. This book was released on 2013-06-13 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: The improvement of crop species has been a basic pursuit since cultivation began thousands of years ago. To feed an ever increasing world population will require a great increase in food production. Wheat, corn, rice, potato and few others are expected to lead as the most important crops in the world. Enormous efforts are made all over the world to document as well as use these resources. Everybody knows that the introgression of genes in wheat provided the foundation for the “Green Revolution”. Later also demonstrated the great impact that genetic resources have on production. Several factors are contributing to high plant performance under different environmental conditions, therefore an effective and complementary use of all available technological tools and resources is needed to meet the challenge.
