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Part 1 of ebook Laboratory outlines in plant pathology provide readers with content about: necrotic diseases caused by bacteria and caused by fungi, cause, not an organism; pseudopeziza leaf-spot of alfalfa and clover; endothia canker of chestnut;... Please refer to the part 1 of ebook for details!
sh sith -* Recast sta? re oo Gas Ob 75/ ceo lie, AA eae 2? CopyrightN° COPYRIGHT DEFOSE: PabORATORY OUTLINES IN PLANT PATHOLOGY BY H H WHETZEL Professor of Plant Pathology LEX R HESLER CHAS Assistant Professor of Plant Pathology Ty GREGORY Assistant Professor of Plant Pathology W HOWARD RANKIN Assistant Professor of Plant Pathology NEW YORK STATE COLLEGE OF AGRICULTURE AT CORNELL UNIVERSITY ITHACA, Nox £OT6 PUBLISHED BY THE AUTHORS COPYRIGHT, 1916 H H WHETZELL -_— set ae OCT 30 1916 * W F Humphrey, Printer, Geneva, N Y ©cra445394 © PREFACE / ‘HESE outlines are designed solely for the purpose of most effectively acquainting the student with the laboratory materials presented in this course They are the result of several years of experience and test in actual practice work They have been frequently revised It is expected that they will now be revised and reprinted at least every two years Although the acquisition of a body of facts is an important and necessary part of the work in such a course a more vital feature is the training in logical methods of acquiring them The student is urged to follow his outline carefully, making sure at each step, that the outline and the materials before him agree ‘The same sequence of treatment is followed throughout all the outlines This sequence in procedure should be mastered promptly The term papers will afford opportunities for determining how well the student has grasped the logic of this procedure The grouping of diseases here presented is, we believe, an important step in diverting attention from the domination of systematic mycology in phytopathological teaching and writing, and of directing it toward the more logical classification and study of diseases on the basis of the pathological phenomena exhibited At the same time the subgrouping of the diseases, according to the chief etiologic factor involved, provides for a point of view still generally presented in the teaching of plant pathology It is not expected that all the diseases herein outlined will be covered in a three hours’ course The instructor will make such selections from the different groups as will best serve his purpose in illustrating the fundamentals of the subject in the case of the students in his classes No laboratory practice in the methods of control of the diseases studied is provided That phase of the subject is fully treated in the course based upon and following this, namely, The Principles of Plant Disease Control These outlines are designed specifically for the work as given at Cornell University and without any attempt to adapt them for use in other institutions It is hoped, however, that teachers elsewhere may at least find them helpful and possibly usable in their classes Acknowledgments are due Mr Chas Chupp, instructor in the department of Plant Pathology for the preparation of a number of the outlines We also gratefully acknowledge the friendly advice and assistance of the Comstock Publishing Company in our effort to make the cost of these outlines to the student as reasonable as possible \ THE AUTHORS CONTENTS ; PAGE ieldie (rip: ssi ceee neces as EMOT Witeratuneror PlanteWiseases! % GOIDISE OIC CE EOI ee eae 4.520 se%n s She ste © Seal ae Senso eele eis NECROTIC Caused a 10 DISEASES by bacteria EYDRE, EF ie Sy ea Len SN eT re Streak of Sweet Peas NTRS CIE Olin GORA Se Soon eee TByervay J Bieofee, alee eA rch a Bibs sei SES cae ee ae een ee em ee Vie kagern NS PATOLLE See cee ici aL anatattc Saleh) Gye 0.545 Nis alo disisie sy volSlew aveievla EAL OVO SOU le ORI eid ois tale's Seine aici s