LmTER OF TRANSMITTAL 



U. 8. DErAKTMENT OF AcJRICULTURE, 



Division of Entomology, 



Wa><hington, D. (?., July 29, 190S. 

 Sir: I transmit herewith the manuscript of a report on the oodling 

 moth, prepared under my direction l)y Mr. C. B. Shnpson, lield ai>ent 

 of this Division. Mr. Simpson had been charged with a special inves- 

 tigation of the codling moth, more particularly in the Northwest, in 

 answer to special requests for such study in the newly developing 

 fruit interests of that region. The codling moth is undou])tedly the 

 most important insect pest of apple and pear, and is the occasion 

 of greater loss than all the other insect enemies of these fruits com- 

 bined, entailing an annual shrinkage of values exceeding $11,000,000. 

 Mr. Simpson's investigations covered a period exceeding two years, 

 and have alread}" been voiced in a small preliminary l)ulletin and in a 

 Farmers' Bulletin giving condensed advice relative to the control of 

 this insect. The present publication is the final and complete report, 

 elaborating all of the conclusions and results of this special investiga- 

 tion. It will be a very useful document for all workers in applied 

 entomology and of decided practical value for the fruit grower. 

 The illustrations Avhich accompany it are essential to the correct 

 understanding of the experiments reported and of the text. I recom- 

 mend that this report be published as Bulletin No. 41 of the Division 

 of Entomology. xVs stated in the lettor of transmittal of l)ulletin No. 

 •10, the term "'New Series" has been dropped. 

 Respectfully, 



L. O. Howard, 



Entoinoloijist. 

 Hon. James Wilson, 



Secretary uf A</rlculture. 



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