142 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



quite close to the time the last larva? had matured in the field accord- 

 ing to the band record. 



The senior author observed a half-grown larva feeding in an apple 

 in a tree November 30, 1911, and it is possible larva? could live much 

 longer in the field if the fruit was not picked or would fall from the 

 trees. 



REVIEW OF LIFE-HISTORY WORK OF 1910. 



During 1910 the life-history work of both broods of the codling 

 moth was carefully worked out and results of these observations are 

 shown in the diagram, figure 31. This diagram is an effort to depict 

 the condition of the insect in orchards during the season as based on 

 data obtained in the laboratory. Spring pupa? appeared shortly after 



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Fig. 31.— Diagram showing seasonal history of the codling moth during the season of 1910. (Original.) 



the middle of February and continued to appear until June, reaching 

 a maximum about April 4. Moths began to emerge March 28 and 

 continued emerging until June 9, with an average maximum May 4. 

 Oviposition of *the first-brood eggs extended from April 10 to June 

 20 with a maximum about May 16, while the larva? of the first brood 

 began to hatch April 26 and continued hatching until July 22, reach- 

 ing a maximum about May 29. The larvae of the first brood cocooned 

 from May 28 up to August 14 with a maximum about July 3. About 

 June 4 the first-brood pupa? were present and continued until Sep- 

 tember 3, reaching a maximum about July 14. Emergence of the 

 first-brood moths commenced June 22 and lasted three months or 

 until September 22, with a maximum about August 4. Second-brood 

 eggs were deposited from July 1 until September 28, reaching a 



