xii 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 Seale. 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. O’Gara, 
Pathologist and Chief in Charge of 
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. 
special use; for the loan of many valu- 
able photographs and drawings, and of 
colored plates. 
Also to Mr. HE. O. Essia, 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 Proressors O. M. Morris 
of the Washington Station, W. H. 
Wioxs of Idaho, R. A. Cooztsy of Mon- 
tana, J. H. Sramn of the Western 
Washington Station, W. T. Macoun of 
Ottawa, Canada; D. B. Swinare of Mon- 
tana, H. A. Gossarp of Ohio, H. Gar- 
man of Kentucky, as well as a long list 
of others, and to Mr. C. C. Grorceson 
of the Alaska Station. 
To a large number of persons in every 
To Mr. Frank 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 Proressor P. F. Writ1ams, of the Miss- 
issippi Experiment Station, for valuable 
original contributions on the subject of 
Fruit and Vegetable Growing in the 
Gulf States. 
To Prorsessors C. I. Lewis, H. F. Witson, 
H. S. Jackson, H. P. Barss, A. L. Lov- 
ert, F. C. Rermer and F. D. Barrey 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 
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. 
