CONTENTS 



Introduction 291 



Characteristics 291 



Number of species 292 



Injuries — 293 



Means of dispersal 293 



Certain species of value 294 



Recognition of scale insects 295 



Key based on superficial characters 

 of species treated 295 



Appletree bark louse, Mytilaspis 

 pomoruml 297 



Scurfy bark louse, Chionaspis 

 furfura 300 



Pernicious or San Jose scale insect, 

 Aspidiotus perniciosus.. 304 



European fruit scale insect, Aspid- 

 iotus ostreaeformis 323 



Putnam's scale insect, Aspidiotus 

 ancylus 326 



Cherry scale insect, Aspidiotus 

 forbesi 330 



White scale insect of the ivy, Aspid- 

 iotus hederae 333 



Remedial measures 336 



Only contact insecticides of value.. 336 



Remedial measures {continued) 



Whale oil soap 136 



Whale oil soap and crude petroleum 



combination 337 



Crude petroleum emulsion 337 



Crude petroleum undiluted 338 



Kerosene 339 



Kerosene emulsion 339 



Other summer sprays 339 



Fumigation in orchards 339 



Fumigation of nursery stock 341 



Technical study of four species of 

 Aspidiotus, by Miss M. F. , 



Boynton 343 



Preface 343 



Key 347 



Aspidiotus forbesi .. 347 



Aspidiotus perniciosus.. 349 



Aspidiotus ancylus 351 



Aspidiotus ostreaefor- 

 mis 352 



Scale insects, Coccidae, in New York 

 state 354 



Explanation of plates 361 



Index 367 



lA general accouat and bibliography of each is given. 



