Fifteen years ago the plant pathologists of America welcomed the appearance of “Fungous Diseases of Plants,” by B. M. Duggar, as the first general text or reference book of American origin to occupy the field. Although a number of books have since been written covering special phases of plant pathology, no general manual has appeared to serve as a guide in classes in general plant pathology, which has now become an accepted part of the agricultural curriculum. The pressing need for a modernized book for use in the author's classes was the motive that prompted the preparation of this book. The plan of presentation of the subject is essentially that which has been followed in the author's classes for the last 10 years.
An attempt has been made to present a view of the whole field of plant pathology, including environmental and virus diseases as well as those of bacterial and fungous origin, as it is felt that a book of restricted scope would perpetuate an erroneous notion which has been prevalent in recent years as to the real province of plant pathology. It has also seemed advisable to avoid the dictionary type of presentation, and to give instead a detailed consideration of a much smaller number of diseases, with the hope that this method of approach will impress the student with the importance of the subject and stimulate detailed rather than superficial study. Additional types with a few guiding references are given with the expectation that the student may be led to develop these according to the general plan.
No attempt has been made to present an organized treatment of culture methods and general plant pathological technique, or of the principles and practice of disease control, since, with the rapid strides made in recent years, it is the practice to present these phases of the subject in separate courses. Special manuals covering these subjects would be welcomed by all teachers. In the treatment of the parasitic ' diseases it has seemed desirable to follow the taxonomic sequence, rather than host groups, since it is not generally possible to require systematic mycology as a prerequisite to the elementary course in plant pathology. It has been the aim to introduce enough systematic mycol-f) ogy to provide for this lack of mycological preparation. The order of presentation may not suit all teachers. In actual practice, it may be varied if desired by passing to Sec. IV, Parasitic Diseases, immediately following the two introductory chapters and then returning to a con; sideration of the non-parasitic and virus diseases, A number of principles have guided the selection of the diseases given detailed treatment. Consideration has been given to types of disease, economic importance, causal factors or pathogenes and control methods. Limitation of space is the only excuse for the omission of certain important diseases which would otherwise have been introduced. It is felt that the historical introductions are well worth attention, as they will serve to impress the student with the fact that our present knowledge rests upon a long series of painstaking researches, but that in most cases the field is still open for new discoveries.
The author is indebted to a large number of pathologists for illustrations, which are credited in the legends, and to other pathologists for suggestions during the progress of the work. Special acknowledgment is here made to the late Dr. c. V. Piper for suggestions and criticisms covering the entire manuscript, and to the following for a critical reading of portions of the manuscript: Dr. L. IL Jones, Dr. I. E. Melhus, Dr. c. T. Gregory, Dr. F. A. Weiss, Dr. Fred R. Jones, Prof. J. B. s. Norton, Dr. G. w. Keitt, Prof. H. p. Barss, Dr. L. K. Jones, Mr. D. F. Fisher, Dr. A. J. Mix, Prof. F. c. Reimer, Dr. A. J. Riker, Dr. w. H. Martin, Dr. c. w. Hungerford, Dr. Wanda Weniger, Dr. N. J. Giddings, Dr. L. w. Durrell, Dr. M. F. Barrus, Dr. L. R. Hesler, Prof. R. E. Smith, Prof. L. E. Melchers, Dr. J. J. Taubenhaus, Dr. Haven Metcalf, Mr. G. F. Garvatt, Mr. R. p. Marshall, Dr. E. c. Stakman, Dr. V. F. Tapke, Dr. N. A. Cobb, Dr. Win. Trelease, Dr. G. L. Peltier, Dr. H. T. Giissow, Prof. w. T. Horne, Dr. Chas. Brooks and Prof. F. c. Stewart. In general, the plan was followed of submitting portions of the manuscript for critical reading to those workers who had previously made a special study of the subjects covered. The author has incorporated many valuable suggestions received from these sources, and here wishes to express his appreciation for the assistance rendered. For the final form of the manuscript, the author alone is responsible.
The author is also indebted to his co-workers, Prof. B. F. Dana, Mr. E. E. Honey and Mr. G. L. Zundel, for suggestions and aid during the progress of the work.
[EBOOK] MANUAL PLANT DISEASES, BY FREDERICK DEFOREST HEALD, M.S., Ph.D., McGRAW-HILL BOOK COMPANY, Inc.
Keyword: ebook, giáo trình, plant diseases, bệnh cây, bệnh hại cây trồng, bệnh cây chuyên khoa, chẩn đoán bệnh cây
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