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 A 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. O. 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 



5 



