UNITED STATES DEPARTMENT OF AGRICULTURE 



In Cooperation with the 

 Washington Agricultural Experiment Station 



DEPARTMENT BULLETIN No. 1235 



Washington, D. C. V November 28, 1924 



LIFE HISTORY OF THE CODLING MOTH IN 

 THE YAKIMA VALLEY OF WASHINGTON 



By 



E. J. NEWCOMER, Entomologist, and W. D. WHITCOMB, Assistant Entomologist, 

 Fruit Insect Investigations, Bureau of Entomology 



CONTENTS 



Page 



Introduction 1 



The Yakima Valley 2 



Definitions of Terms. 4 



Methods and Rearing Apparatus Employed in the Life-History Studies 4 



The Insectary . 6 



Seasonal-History Studies of 1919 6 



Codling Moth Band Studies of 1919 20 



Seasonal-History Studies of 1920 22 



Codling Moth Band Studies of 1920 35 



Seasonal-History Studies of 1921 37 



Codling Moth Band Studies of 1921 53 



Variations in the Seasonal History of the Codling Moth in the Upper and Lower Yakima 



Valleys *. 55 



Seasonal-History Studies at Wenatchee, Wash., 1915-1916 56 



Miscellaneous Studies •• 5S 



Review of Seasonal History of the Codling Moth in 1919, 1920, and 1921 72 



Summary 73 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1924 



