LETTHK OF TRAXSMITTAI.. 
U. S. Department of A(;kicui.ture, 
Division of Entomology. 
Wash'nuiton, I). C, Jxhj 20, 100 J. 
Sik: I transmit herewith the manuscript of a report on the codling 
moth, prepared under my direction hv Mr. C. B. Simpson. Held agent 
of this Division. Mr. Simpson had l)een 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 undoubtedly 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.o()ojm.m». 
Mr. Simpson's investigations covered a period exceeding two years, 
and have already been voiced in a small preliminary bulletin and in a 
Farmers* Bulletin giving condensed advice relative to the control of 
this insect. The present publication is the linal 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 api^lied 
entomology and of decided practical value for the fruit grower. 
The illustrations which 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. -tl of the Division 
of Entonrjlogy. As stated in the lett?r of transmittal of ))ulletin Xo. 
40. the term "New Series" has been dropped. 
Kespectfully, 
L. O. lIoWAKI), 
K)i tomoIo(j i'st. 
Hon. flAMEs Wilson.* 
fScrrrff/r// <>f A(//'icalturc. 
