PREFACE 
THE main object of this book is to bring before growers 
of glasshouse plants the fundamental principles of 
disease control, in the hope that it may be of some 
assistance to them in the course of their business. Its 
preparation was stimulated by a desire to supply more 
detailed information in reply to many inquiries than 
can be set forth in routine correspondence. 
An attempt has been made to describe the chief 
diseases of glasshouse plants in this country. Structural 
details of the causal organisms have been purposely 
omitted as these do not concern the practical man, but 
special attention is paid to methods of control. 
I have to acknowledge my indebtedness to Sir John 
Russell, D.Sc., F.R.S., and Dr. W. B. Brierley for the 
kindly assistance they have so freely given during the 
preparation of this work. 
I am indebted to Mr. E. R. Speyer for the photographs 
on pages 42, 69, 88, 114 and 161, and to Mr. O. Owen 
for kindly reading the manuscript. 
For permission to publish the frontispiece and the 
material and photographs on pages 56, 57, 73—84, 
127—133 I am indebted to the Association of Economic 
Biologists, in the official journal of which they first 
appeared. 
Finally, I have to record my gratitude to Miss Helen 
Marchant, who kindly undertook the preparation of the 
manuscript. 
W. F. B. 
CHESHUNT, September, 1923. 
