34 



BULLETIN 429, U. S. DEPARTMENT OF AGRICULTURE. 



The occurrence of the larvae of the codling moth in orchards as 

 shown by results of the band records is graphically described by 

 means of curves in figure 5. From this figure it may be deduced 

 that the greatest number of larvae of the first brood leaving the fruit 

 was found to occur about June 7. Larvae of the second brood 

 appeared under the bands in greatest numbers in the neighborhood 

 of July 25, or practically 50 days after a maximum was found in the 

 first brood. TVith reference to the third brood it will be noted that 

 the greatest number of larvae were found September 14, which is 

 just 51 days following the corresponding stage of the second genera- 

 tion. These figures agree very well, however, with the conclusion 



700 

 680 

 660 

 6*0 

 620 

 600 

 S80 

 S6 

 S*0 



seo 



500 



*eo 

 *6o 

 »*o 



*£0 

 *-0 

 380 

 360 

 3*0 

 32 

 300 

 280 

 260 

 2*0 

 SSO 

 ZOO 

 /BO 

 160 

 1*0 

 1 SO 



/oo 



60 

 60 

 *0 



so 



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Fig. 5.— Curve showing occurrence of the codling -moth larvae under bands on apple trees, Roswell, N. 



Mex.. 1912. (Original.) 



drawn from records obtained in the rearing shelter with insects in 

 confinement. (See summary tables on the different generations.) 



SEASONAL-HISTORY STUDIES OF 1913. 



The results of the 1913 life-history studies of the codling moth do 

 not, in general, differ greatly from those obtained the previous year. 

 They are, however, somewhat more complete and detailed in certain 

 respects, and are therefore more satisfactory, for the observations 

 during this season were conducted under more favorable conditions. 



SOURCE OF REARING MATERIAL. 



Rearing material consisted of wintering larvae of 1912, kept in an 

 outside shelter and subjected to existing weather conditions, and 

 other material which could be considered quite normal and from 

 which reliable conclusions could be drawn. 



