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 
v 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 
Page 
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 Kiibner . . 42 
Explanation of Plates 45 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1922 
