INTRODUCTION 



DISEASES AND PESTS 



These are treated usually under the most important host plant, at the 

 end of the article on that plant. To illustrate: San Jose Scale is treated 

 under Apple Pests at the end of the article on Apple. Or, the exact page 

 upon which the article on San Jose Scale begins may be found by looking 

 under Apple Pests in the index or alphabetically under its own head, San 

 Jose Scale. Where long lists of diseases, pests, etc., have occurred, the 

 scientific names have not been used, but where each separate disease or 

 pest has been listed in its own alphabetical order the scientific name has 

 been added. 



CONTRIBUTORS 



The contributors have been chosen with a special view not only to 

 technical knowledge of their various specialties but also from the fact of 

 practical experience with the actual conditions to be met by the average 

 grower. 



The editors wish to acknowledge espe- 

 cial indebtedness to Mr. P. J. 0'G.\ra. 

 Pathologist and Chief in Charge ot 

 Agricultural Investigations, American 

 Smelting and Refining Co., Salt Lake 

 City; formerly Pathologist and Ento- 

 mologist for the Rogue River valley, 

 who has maintained a helpful interest 

 in the project from the beginning, has 

 lent his aid in the form of numerous 

 contributions, and especially through an 

 exhaustive article on the nature and 

 control of Blight of Apples and Pears, 

 and through valuable advice. 



To Mr. Fr.\nk Kinsey for unstinted 

 labor in the collection and preparation 

 of the article on Apple Packing and 

 Warehouse Management, and for num- 

 erous helpful suggestions along the line 

 of allied subjects. 



To Professor P. F. WrLLi.\Jts. of the Miss- 

 issippi Experiment Station, for valuable 

 original contributions on the subject ot 

 Fruit and Vegetable Growing in the 

 Gulf States. 



To Professors C. I. Lewis, H. F. Wilson. 

 H. S. Jackson, H. P. Bar.ss, A. L. Lov- 

 ETT, F. C. Reijier and F. D. Bailey of 

 the Oregon Experiment Station, and to 

 the Station itself for the use of matter 

 which has appeared from time to time 

 in the publications of the Station and 

 which has been revised and brought 

 down to date at no little labor for our 



special use; for the loan of many valu- 

 able photographs and drawings, and of 

 colored plates. 



Also to Mr. E. O. Essie, of the California 

 Horticultural Commission, for similar 

 services; and for the loan of a large 

 number of photographs, and to other 

 members of the Commission for simi- 

 lar kindness in permitting the use of 

 practical suggestions as to the control of 

 insect pests. Our work would be much 

 poorer but for the generosity and help- 

 fulness of these men. 



We wish to acknowledge the kindly offices 

 of the Directors of most of the Experi- 

 ment Stations, heads of Bureaus in the 

 Department of Agriculture and Teachers 

 of Horticulture in the State Institu- 

 tions, notably Profes.sor.s O. M. Morris 

 of the Washington Station. W. H. 

 Wicks of Idaho, R. A. Cooley of Mon- 

 tana, J. H. Stahl of the Western 

 Washington Station, W. T. Macoun of 

 Ottawa, Canada; D. B. Swingle of Mon- 

 tana, H. A. GossARn of Ohio, H. Gar- 

 man of Kentucky, as well as a long list 

 of others, and to Mr. C. C. Georgeson 

 of the Alaska Station. 



To a large number of persons in every 

 state who through correspondence or 

 personal suggestion and advice have 

 lent their aid to make this compilation 

 possible. The names of more than 200 

 persons appear in this work as the 

 authors of material worthy of note. 



