20 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XXII.— Transition to wintering larvae in 1907. 



Larvae forming cocoons under bands. 



Number 

 winter- 

 ing. 



July 22-29 



July 29-August 5 



August 5-12 



August 12-19 



August 19-26 



August 26-September 2 

 September 2-9 



Table XXIII. — Transition to wintering larvx in 1908. 

 [From record made by Mr. S. W. Foster.] 



Larvae forming cocoons under bands. 



Number 



Number 



pupat- 



winter- 



ing. 



ing. 



15 



1 



26 







27 



1 



63 



6 



16 



6 



11 



12 



1 



5 







11 



July 13-20 



July 20-27 



July 27-August 3 



August 3-10 



August 10-17 



August 17-24 



August 24-31 



August 31-September 7 



After September 1 all larvae appearing under bands were of the 

 wintering brood. While some of the later second-brood larvae may 

 go over winter, there is evidence that most of them produce a second 

 brood of moths instead. The species is therefore dependent largely 

 upon the third-brood larvae to perpetuate itself from season to 

 season. 



Conditions affecting wintering larvae in the orchard were not 

 observed. Around the out door apple bin at a vinegar factory where 

 large numbers of cocoons were examined in March and April the 

 great majority of them contained live larvae or pupae. 



REVIEW OF REARING WORK OF THE SEASON. 



An effort was made to rear through the season a continuous line 

 of pedigreed stock from the earliest spring moths, with the principal 

 object of ascertaining the maximum number of generations. With 

 the exception of one unimportant break early in the season, this 

 program was successfully carried out. 



The start was made from a number of eggs collected in the field 

 and hatching May 4, several days before the hatching of the first 

 eggs laid in cages. The larvae were reared in bagged fruit on trees, 

 and developed into first-brood adults as shown in Table XXTV. 



