UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 1032 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



April 25, 1922 



THE BLACKHEAD FIREWORM 

 OF CRANBERRY 



ON THE PACIFIC COAST 



BY * 



H. K. PLANK 



Scientific Assistant, Fruit Insect Investigations 



In cooperation with the Washington Agricultural Experiment Station, with 

 Technical Description by CARL HEINRICH, Bureau of Entomology 



CONTENTS 



Introduction 1 



Introduction of the Blackhead Fireworm 



into the Northwest 4 



Distribution 5 



Food Plants 5 



Destructiveness • . 5 



Number of Generations 6 



Description of Stages and Habits 7 



Page 



Seasonal History 19 



Natural Enemies 20 



Control Experiments 22 



Recommendations for Control 34 



Summary and Conclusions 37 



Systematic Description of Rhopobota 



naevena Hiibner 42 



Explanation of Plates 45 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1922 



