Plant Disease An Advanced Treatise, Volume II: How Disease Develops in Populations deals with the epidemiological aspect of disease in population of plants. Comprised of 18 chapters, this volume discusses the comparative anatomy, methods of research, instrumentation, computer simulation, and genetic basis of epidemics. After briefly discussing the sociology of plant pathology, the book presents the comparative anatomy of epidemics in terms of their structure, patterns of development, and dynamics. This volume describes the rational processes of epidemiological research and how they differ from the processes used to investigate disease in individual plants. A chapter examines the instrumentation for measuring the weather component, including temperature, humidity, air movement, and irradiance. Other chapters discuss the measurement of disease on whole living plants; the theory and measurement of inoculum potential; the dispersal of pathogens in both time and space; and the movement and maintenance of infectivity by pathogens that operate below ground. This volume also deals with computer simulators of plant disease and the use of predictive models to forecast epidemics for management decision making. It describes some general patterns of changes in plant-part susceptibility with time for various groups of diseases caused by fungi or viruses. A discussion on the problems of genetic uniformity and susceptibility and the breeding and deployment strategies needed to cope with these problems is included. Other chapters examine the influence of climate and weather on epidemics; the analysis of the geographical and climatic distribution of plants in various parts of the world; and the hazardous practices that have favored epidemics. Lastly, the probabilities of success for quarantines against diseases of various types are provided. This volume is an invaluable source for plant epidemiologists and pathologists, botanists, and researchers.

Nematode interactions are important biological phenomena and of great significance in agriculture. It is a fascinating subject which is multidisciplinary by nature, and concerns any scientist involved with plant health. There have been marked advances in our knowledge of various aspects of the subject in the last two decades. This study area has been the subject of several reviews, but there was no exclusive text on the subject. This has stressed the need to document the information, developing a unifying theme which treated nematode interactions in a holistic manner. This book is about the inter action of plant-parasitic nematodes with other plant pathogens or root symbionts, the nature of their associations, their impact on the host and con sequential interactive effects on the involved organisms. Since nematodes are at the centre of the theme, the responsibility of understanding of other plant pathogens dealt with in this book is largely delegated to the reader. I have limited the book content to interactions with biotic pathogens and root symbionts only, for various reasons. The book embodies 16 chapters, and attempts to present balanced infor mation on various aspects of nematode interactions with other plant pathogens and root symbionts. Some chapters describe general aspects of the subject. Interactions of nematodes with specific groups of organisms are addressed in the remaining chapters.

This book summarizes the advances in nematology that have been made during the 20th century and provides perspectives for the development of nematology in the next century. Chapters comprise: plant diseases caused by nematodes; virus vectors; physiological interactions between nematodes and their host plants; taxonomy of insect parasitic nematodes; resistance to plant parasitic nematodes; crop rotation and other cultural practices as control strategies; use of antagonistic plants and natural products; biological control of nematodes by fungal antagonists; biological control of nematodes with bacterial antagonists; biological control of insects and other invertebrates; cost-benefits of nematode management through regulatory programmes; past and current uses of nematicides; and irradiation effects of plant parasitic nematodes.

First multi-year cumulation covers six years: 1965-70.

Many species of the phylum Nematoda, the nonsegmented worms, play an important role as animal or plant parasites; most species are active contributors to the decomposition cycle in soil ecosystems, but the details of that contribution are just beginning to be understood. Agricultural nematologists, vitally involved in the study of the methodology, taxonomy, and biology of the species due to the direct relationship between crop yield and the size of plant-parasitic nematode populations, have provided much information about the nematodes. More recently, ecologists have contributed additional data on the structure and function of the total soil community, including energy flow and nutrient cycling, and have examined the critical and multifaceted role of soil nematodes in such communities. Nematodes in Soil Ecosystems provides a valuable synthesis of significant research in this area and may stimulate further important communication between the agricultural and ecological branches of nematode research.

Aspects of geographical distribution; Dissemination; Habitants; Communities; Population change; The soil environment; Physical and chemical parameters; Survival; Parasitism of nematodes in biological control; Biological interactions; Effects of agricultural practices on nematode populations.