Download or read book The Life History of Anisogramma Anomala Pk E M ller Diaporthaceae and Its Pathological and Epidemiological Association with Corylus Avellana L written by Timothy Ross Gottwald and published by . This book was released on 1979 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eastern Filbert Blight, caused by Anisogramma anomala (Peck) E. Miller, was first discovered in the Pacific Northwest in 1974. Orchard experiments suggest that the fungus completes its life cycle in two years. Infection takes place from mid-January to May, mainly through mite-galled-buds infested with an Eriophyid mite, Phytocoptella avellanae Nal. Ascospores are presumed to be the only infectious propagules since no conidial stage has been observed during the four years of investigation. After a latency period of 12-16 months, the fungus can be detected in the primary phloem and vascular cambium and later penetrates deep into the xylem. Stromata are initiated during May as indicated by a somatic pressure cushion which gradually crushes and splits the bark to expose the ectostroma. Dense aggregates of smaller fungal cells arise deep within the endostroma in 2-3 layers forming primordia. The primordia consist of an "outer coil" of filamentous hyphal cells terminated by a non-functional trichogyne, surrounding an "inner coil" of more isodiametric ascogenous cells. The centrum arises from this "inner coil" as a loose clump of ascogenous cells which lack croziers. Mononucleate asci arise from these ascogenous cells near the end of July. Meiosis occurs from mid-July through August and each ascus cleaves eight unequally two-celled hyaline ascospores. A. anomala causes a simple interest type of disease during a single season but is considered a compound interest type in longstanding orchards. Disease severity, measured as the percent of plant surface attacked, was evaluated for individual cankers, for individual trees and for orchards as a whole. Disease increase was found to be r=0.265, r=1.084 and r=1.240 units/year respectively. The disease spread south from the original focus which was determined to be a group of five orchards, in the northwest quadrant of the diseased area. Spread of inoculum over long distances is infrequent. Therefore, established secondary foci to the south are more likely to be the source of inoculum to nearby orchards and pose the greatest threat of spread into orchards further south in the main filbert growing areas of Oregon. Various inoculation methods were tested on several filbert tissues. Hypodermic infiltration of ascospores into mite-galled-buds and into healthy non-infested buds, proved to be the only successful inoculation methods giving 46.5 and 29.0 percent infection respectively. There was a general increase in percent infection as inoculation dates approached the natural infection period which was determined to extend from February through May and to correlate with the duration of rainfall during the same season. Ascospores were recovered continuously from each of ten different exposure periods from 26 November to 3 April. Spore release is thought to be at least six months in duration extending well beyond the spore trapping dates, and thus lasts longer than the natural infection period. Heaviest discharge was recorded during periods of constant wetting of the stromata. Free moisture on the stromata induces inoculum discharge which is further dispersed by rain splash. Natural infection occurs when the inoculum is washed between the scales of P. avellanae infested buds. Hypodermic infiltration of ascospores into mite-free-buds also resulted in a substantial percent infection. Following infection there is normally a 12-16 month latency period for symptom expression. Under greenhouse conditions symptoms developed within six months of inoculation. Culture isolation taken from diseased and healthy filbert twigs resulted in a substantial recovery of Phomopsis sp., from 36.4 to 93.2 percent. Therefore although Phomopsis was isolated from cankered tissue it is unlikely that it is more than an epiphyte.
Download or read book O S U Theses and Dissertations 1978 1982 written by Oregon State University and published by . This book was released on 1983 with total page 64 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 1980 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies in the Morphology and Life History of Anisogramma Anomala written by T. R. Gottwald and published by . This book was released on 1979 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Identification of Fungi written by Youssuf Gherbawy and published by Springer Science & Business Media. This book was released on 2010-03-03 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fungi enjoy great popularity in pharmaceutical, agricultural, and biotechnological applications. Recent advances in the decipherment of whole fungal genomes promise an acceleration of these trends. This timely book links scientists from different parts of the world who are interested in the molecular identification of fungi combined with the exploration of the fungal biodiversity in different ecosystems. It provides a compendium for scientists who rely on a rapid and reliable detection of fungal specimens in environmental as well as clinical resources in order to ensure the benefit of industrial and clinical applications. Chapters focus on the opportunities and limits of the molecular marker-mediated identification of fungi. Various methods, procedures and strategies are outlined. Furthermore, the book offers an update of the current progress in the development of fungal molecular techniques, and draws attention to potential and associated problems, as well as integrating theory and practice.
Download or read book Diseases of Forest and Shade Trees of the United States written by George Henry Hepting and published by . This book was released on 1971 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Brown Spot Needle Blight of Pine Seedlings written by Paul V. Siggers and published by . This book was released on 1944 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Naemacyclus needlecast written by Catherine F. Croghan and published by . This book was released on 1981 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Septoria Canker of Poplars in the United States written by Alma May Waterman and published by . This book was released on 1954 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Principles of Forest Pathology written by F. H. Tainter and published by John Wiley & Sons. This book was released on 1996-01-26 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the practical aspects of forest diseases and on practical measures to minimize damage and loss. Forest Pathology is a reference book that deals with the study of the problems and damage to forests due to: plant diseases, insects, fire, weather, and animals. It is both a forestry book and a plant pathology book. The first section deals with general topics and principles, including both abiotic causes and biotic causes such as fungi, bacteria, mycoplasms, and viruses. The second section presents the details of particular forest diseases and offers practical management suggestions.
Download or read book European Handbook of Plant Diseases written by I. M. Smith and published by John Wiley & Sons. This book was released on 2009-07-15 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: An encyclopaedic treatment of plant diseases in Europe, this book is designed as a standard reference volume for the general working plant pathologist and those taking advanced training in plant pathology. It provides a clear, informed and authoritative summary of each entry by an appropriate specialist, with a selection of key references for further reading. The handbook covers the economic diseases of crops and forest trees in Europe, treated by pathogen and classed as pathogens of major, moderate and minor importance. Approximately 1000 organisms are covered in total, including 600 fungi, 100 bacteria, and 300 viruses and similar organisms
Download or read book The Genus Pseudocercospora in China written by Ying-Lan Guo and published by . This book was released on 1995 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Common Names of 7 000 Vascular Plants in the United States written by Lois Brako and published by American Phytopathological Society. This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Including a majority of the plants of interest to plant pathologists and other agricultural scientists, this reference is divided into four sections: a list of scientific names in alphabetical order by genus; a list of common names followed by the scientific name; a list of important synonyms of the scientific name cross- referenced to the accepted scientific name; and a list of the genera of included vascular plants arranged by plant family. Annotation copyright by Book News, Inc., Portland, OR
Download or read book The Bitunicate Ascomycetes and Their Anamorphs written by A. Sivanesan and published by Lubrecht & Cramer, Limited. This book was released on 1984 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Illustrated Dictionary of Mycology written by Miguel Ulloa and published by American Phytopathological Society. This book was released on 2000 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretically translated from the 1991 Dicctionario Illustrado de Micologia, a reference for students of fungus, but in fact also updated and enlarged to include nearly twice as many terms and 80% more illustrations. Many of the some 4,000 entries include black-and- white drawings or photographs illustrating the part or feature being defined. Ulloa (botany, Universidad Nacional Autonoma de Mexico) and Hanlin (plant pathology, U. of Georgia) include the derivation of the words, most of which are from Latin. Unfortunately they do not indicate pronunciation. The cross-referencing is extensive, which mitigates the lack of an index. They also include a short bibliography and an extensive outline of the classification of the taxa they cover down to the genus level. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Field Guide to Tree Diseases of Ontario written by C. N. Davis and published by Sault Ste. Marie, Ont. : Great Lakes Forestry Centre. This book was released on 1997 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fungal Biology written by David Harry Jennings and published by . This book was released on 1996 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text originates from a series of lectures given by the authors. It is aimed primarily at first- and second-year biology students starting courses in mycology or microbiology in which the study of fungi is a significant component
