Epidemiological and Biological Aspects of Septoria Nodorum Berk., a Pathogen of Wheat in Eastern Washington PDF Download
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Author: Jose Mauricio Fernandes Publisher: ISBN: Category : Seed pathology Languages : en Pages : 254
Book Description
Glume blotch of wheat, a disease incited by Septoria nodorum (=Leptosphaeria nodorum), was monitored through a succession of surveys during the period 1982-84 in eastern Washington . Findings revealed that infection in wheat occurs soon after seeddling emergence . Infection levels, varying upward of 70% in one of the two years, remained consistently high from November to March, declined somewehat in April-May and dropped dramatically in late May and June . It is speculated that such a decline is attributable to progressively fewer number of rainy days, lower relative humidities, shorter dew periods and elevating temperatures as the spring seasion advances . The viability of conidia of Septoria nodorum exposed on plastic strip underwent a corresponding decline with the advent of warmer, drier weather. The source of inoculum associated with the onset of the disease was linked to the presence of spore bearing pycnidia on debris of the previous wheat crop . The perfect stage of the fungus was never found on wheat or graminicolous hosts around and within wheat fields. Glume blotch effects on kernel weight of wheat was highly correlated with nodal infection . Substantial yield reduction ocurred when disease was imposed at the flowerig stage .According to criteria established by studying the relationship of organ infection and reduction in kernel weight it seemed unlikely that glume blotch is a disease of economic threat to the wheat industry in the Palouse. A new technique, involving the injection of inoculum into culms, was developed for evaluating cultivar reaction to glume blotch. A study of the survival of the fungus in hosts other than wheat indicated that downy chess (Bromus tectorum) may seerve as an effective alternative host. This host may play a role in the epidemiology of the disease in eastern Washington as well. Notwithstanding the results reported elsewhere, virulence of locally collected wheat isolates of Septoria nodorum, was not altered by ten consecutive passages through barley.
Author: Jose Mauricio Fernandes Publisher: ISBN: Category : Seed pathology Languages : en Pages : 254
Book Description
Glume blotch of wheat, a disease incited by Septoria nodorum (=Leptosphaeria nodorum), was monitored through a succession of surveys during the period 1982-84 in eastern Washington . Findings revealed that infection in wheat occurs soon after seeddling emergence . Infection levels, varying upward of 70% in one of the two years, remained consistently high from November to March, declined somewehat in April-May and dropped dramatically in late May and June . It is speculated that such a decline is attributable to progressively fewer number of rainy days, lower relative humidities, shorter dew periods and elevating temperatures as the spring seasion advances . The viability of conidia of Septoria nodorum exposed on plastic strip underwent a corresponding decline with the advent of warmer, drier weather. The source of inoculum associated with the onset of the disease was linked to the presence of spore bearing pycnidia on debris of the previous wheat crop . The perfect stage of the fungus was never found on wheat or graminicolous hosts around and within wheat fields. Glume blotch effects on kernel weight of wheat was highly correlated with nodal infection . Substantial yield reduction ocurred when disease was imposed at the flowerig stage .According to criteria established by studying the relationship of organ infection and reduction in kernel weight it seemed unlikely that glume blotch is a disease of economic threat to the wheat industry in the Palouse. A new technique, involving the injection of inoculum into culms, was developed for evaluating cultivar reaction to glume blotch. A study of the survival of the fungus in hosts other than wheat indicated that downy chess (Bromus tectorum) may seerve as an effective alternative host. This host may play a role in the epidemiology of the disease in eastern Washington as well. Notwithstanding the results reported elsewhere, virulence of locally collected wheat isolates of Septoria nodorum, was not altered by ten consecutive passages through barley.
Author: T.T. Kozlowski Publisher: Elsevier ISBN: 0323155170 Category : Science Languages : en Pages : 342
Book Description
Water Deficits and Plant Growth, Volume V: Water and Plant Disease presents a comprehensive treatment of the role of water deficits and excesses in the plant disease complex. This book highlights water relations of diseased plants and the effects of water stress induced by disease and environmental factors, along with water deficits related to disease and water stress as a predisposing factor in plant disease. This volume is organized into nine chapters and begins with an overview of the water relations of diseased plants, focusing on root, foliar, and shoot diseases, as well as vascular wilts. The following chapters examine the effects of water deficits on pathogen and host, the degree and duration of water deficits as predisposing factors in plant disease, and important abiotic diseases induced by water deficits and excess. The discussion then turns to water in relation to active and passive liberation of spores, as well as to the infection process. This book also explains soil moisture in relation to spread and survival of pathogens, the link between water and seed decay, field and storage fungi that affect seeds, and water in relation to wood deterioration. This volume concludes with a chapter on moisture as a factor in epidemiology and the forecasting of disease. This book is a valuable resource for scientists and investigators in fields such as botany, plant pathology, forestry, agriculture, and biology.
Author: Jürgen Kranz Publisher: Springer Science & Business Media ISBN: 3642955347 Category : Technology & Engineering Languages : en Pages : 302
Book Description
Most books on epidemiology have treated the subject from a statistical, mathematical or computer applicational point of view. However, experiments must be performed first to provide the data for models which in turn can then be proven by further experimentation. This mutual interplay of theory and empirics gives epidemiology its scientific thrust and charm. This book provides a choice of methods for varying applications and objectives, covering all important aspects for the designing of experiments. Furthermore, the reader is supplied with solutions to his experimental problems and many "tricks of the trade". The newcomer to the field will also profit by this methodology guide.
Author: Th. Jacobs Publisher: Springer Science & Business Media ISBN: 9401120048 Category : Science Languages : en Pages : 370
Book Description
From February 24 -28, 1992 an international symposium on Durability of Disease Resistance was held at the International Agricultural Centre in Wageningen, the Netherlands. The symposium, organized by the Department of Plant Breeding of Wageningen Agricultural University and the Centre for Plant Breeding and Repro duction Research, CPRO-DLO, was part of the DGIS funded programme Durable Resistance in Developing Countries. Without any form of prevention or protection nearly all crops will be seriously or even severely damaged by a range of pathogens. In modern agriculture man has been able to control many if not most pathogens using i) pesticides, ii) phyto sanitary methods such as control of seed and plant material in order to start a crop disease free, iii) agronomic measures such as crop rotation, iv) disease resis tance or combinations of these measures. Over the years the use of pesticides has increased enormously and so did the pro blems associated with pesticide use, such as environmental pollution and building of resistance and tolerance to these pesticides in the pathogens. The use of resis tance too increased strongly over the years and here too problems arose.
Author: John H. Andrews Publisher: Springer Science & Business Media ISBN: 146123168X Category : Science Languages : en Pages : 504
Book Description
The leaf surface or phyllosphere is a major habitat for microorganisms. Microbes on or within leaves play important roles in plant ecology, and these microbes can be manipulated to enhance plant growth or reduce plant disease. This book presents a number of critical reviews by internationally recognized experts on the microbial ecology of leaves. Topics include methods of assessment of microbial populations on leaf surfaces, leaves as reservoirs of ice nucleation phenomenon, and leaves as microbial habitats in both aquatic and terrestrial environments. The book will be of interest to students and scientists in numerous disciplines, including botany, aerobiology, meteorology, ecology, agriculture, and microbiology.
Author: Jose Mauricio Fernandes
Author: Jose Mauricio Fernandes
Author: J. M. Fernandes
Author: Jose Mauricio Fernandes
Author: 
Author: 
Author: 
Author: T.T. Kozlowski
Author: Jürgen Kranz
Author: Th. Jacobs
Author: John H. Andrews