UNITED STATES DEPARTMENT OP AGRICULTURE 

 BULLETIN No. 805 



Contribution from the Bareaa of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



December 15, 1919 



TWO LEAFHOPPERS INJURIOUS TO 

 APPLE NURSERY STOCK 



A. J. ACEERMAN, Scientific Assistant 

 Deciduous Fruit Insect Investigations 



CONTENTS 



Introdaction 



The Apple Leaf hopper .*..... 



History 



Distribution 



Food Plants 



Character of Injury 



Extent of Injury and Influencing 

 Factors 



Description of Stages 



Allied Species 



Life History and Habits 



Summary of Seasonal History . . 



Th« Rose Leaf hopper 20 



History 20 



Synonymy 21 



Origin and Distribution ..... 21 



Food Plants 21 



Character of Injury 22 



Description of Stages 22 



Life History and Habits 23 



Summary of Seasonal History . . 28 



Natural Enemies 28 



Remedial Meastires 29 



Sumxnary 33 



Literature Cited 34 



WASHINGTON 



GOVERNMENT PRINTING OETTCB 



1919 



