48 BULLETIN 252, U. S. DEPARTMENT OF AGRICULTUKE. 



In 1913 apples were in bloom from about May 18 to June 4, when 

 the last of the petals had fallen. The temperatures during the 

 blooming period were relatively low, accompanied by considerable 

 precipitation. In 1914 the blooming period was favored with some- 

 what better weather conditions and, as a result of these climatic con- 

 ditions, the moths of the spring brood began to issue a few days earlier 

 than in 1913. 



The average length of the life of the male spring-brood moth in 

 1913 was 10.685 days; of the female moth, 12.253 days. In 1914 

 the average life of the male moth was 13.708 days; female moth, 

 13.621 days. 



Oviposition by moths of the spring brood began at very nearly the 

 same time each year. In 1914, however, the period of oviposition 

 extended about two weeks longer than in the preceding year. The 

 average duration of the oviposition period in 1913 was 14.086 days; 

 in 1914, 13.636 days. 



Hatching of the first-brood eggs in 1913 began a few days prior to 

 the date of the earliest hatching in 1914. Likewise hatching ceased 

 in 1913 about three days earlier than in 1914. The average incuba- 

 tion period of the first-brood eggs in 1913 was 8.874 days; in 1914, 

 7.797 days. 



The time of leaving the fruit by transforming larvae of the first 

 brood was approximately the same during each season. The average 

 feeding period of the tranforming larvae in 1913 was 23.432 days; in 

 1914, 21.082 days. 



The time of leaving the fruit by the overwintering larva? of the 

 first brood was, during both seasons, a few days later than the time 

 when the earliest transforming larvae left the fruit. The period of 

 leaving the fruit extended over a longer time in 1914 than in the 

 preceding year. The average feeding period for the overwintering 

 first-brood larvae in 1913 was 27.884 days; in 1914, 29.348 days. 



The pupation period of the first or summer brood covered practi- 

 cally the same time during 1913 and 1914, being slightly earlier in 

 the latter year. The average length of the pupal stage in 1913 was 

 15.066 days; in 1914, 15.250 days. 



The emergence of the first or summer brood of moths extended 

 over approximately the same period during both seasons, being 

 slightly earlier in 1913 than in the following year. 



Oviposition by moths of the first or summer brood commenced 

 about five days earlier and ceased about five days later in 1913 than 

 in the following year. 



The average life cycle of the first generation in 1913 was 51.566 

 days; in 1914, 51.416 days. Add four days for complete life cycle. 



