PREFACE vii 
ically, is simple and therefore useful. The authors have 
attempted to discuss the diseases of each fruit somewhat in 
the order of their general importance and occurrence in the 
United States. Obviously, however, this arrangement is diffi- 
cult to follow. 
Some difficulty has been encountered in compiling certain 
parts of this book. The authors have had no opportunity to 
become acquainted with several of the diseases under field 
conditions. But in some instances inaccuracies have been 
eliminated by a careful criticism of the manuscript by com- 
petent men from other sections of the country. Many other 
parts of the manuscript have been read by colleagues in the 
Department of Plant Pathology at Cornell University. To 
the following contemporaries the authors would express their 
appreciation for valuable assistance along this line: Dr. H. 
M. Fitzpatrick, Mr. E. F. Hopkins, Professor H. 8. Jack- 
son, Dr. W. H. Rankin, Dr. Donald Reddick, Dr. J. R. 
Schramm, Dr. V. B. Stewart and Dr. J. L. Weimer. For 
specimens from which some of the photographs were made, 
and for other accommodations, the authors would make 
acknowledgment to the following: Dr. J. T. Barrett, Pro- 
fessor H. P. Barss, Dr. Charles Brooks, Mr. H. F. Dietz, 
Mrs. L. R. Hesler, Dr. F. D. Kern, Professor W. H. Law- 
rence, Dr. T. F. Manns, Mr. G. W. Martin, Mr. J. W. Roberts, 
Professor W. H. Sackett, Mr. F. N. Wallace, Dr. F. A. Wolf 
and Mr. L. A. Zimm. For photographs loaned to the writers 
due credit is given in each case. 
LEX R. HESLER. 
H. H. WHETZEL. 
CorneELu UNIVERSITY, 
IrHaca, New Yoru, 
October 1, 1916. 
