CONTENTS. 
Page. 
Introduction 7 
Present status of the problem 8 
Origin of the insect 10 
Explorations in eastern Asia 11 
Explorations in Japan 11 
Explorations in China 13 
Record of the spread of the insect 15 
History in California and the West 15 
History in the East 16 
Principal sources of infestation in the East 17 
Summary, by States and Territories, of distribution and present condition. 18 
The relation of climate to spread 33 
Habits and life history 34 
Nature of the damage 34 
Food plants 36 
Citrus fruits and the San Jose scale 42 
Life history 43 
Descriptions of scale and insect 51 
Systematic position and relationships 54 
Means of distribution 56 
Parasites and other natural enemies 58 
True parasites (by L. 0. Howard) 58 
Predaceous insect enemies 62 
Native and introduced enemies of other scale-insects '. . 62 
The Asiatic-ladybird enemy of the San Jose scale 62 
Fungous and other diseases of the San Jose scale . 69 
Means of controlling the San Jose scale 72 
Insecticide applications 72 
The lime-sulfur wash . 73 
The soap treatment. 75 
Kerosene treatment 76 
The oil-water treatment 77 
Petroleum-soap emulsions ■. 78 
Fumigation of nursery stock 79 
Legislation against the San Jose scale 80 
Index 81 
