90 BULLETIN" 429, U. S. DEPARTMENT OF AGRICULTURE. 



The highest oviposition record established was by a female of the 

 second brood in 1913, with a total of 259 eggs. 



Oviposition may occur two days after the emergence of moths, 

 and, on an average, moths of the first brood in 1913 continued ovi- 

 position over a period of 5.7 days. 



The average incubation period for all eggs of the four generations 

 produced during 1913 was 6.4 days. The corresponding average for 

 the three generations during the season of 1912 was 6.8 days. 



Studies in the insectary of the hourly emergence of moths show 

 that of 788 records of individuals the greatest number, 17.44 per 

 per cent, emerged at 3 p. m. In general the maximum period of 

 emergence was found to occur at the time of, or almost immediately 

 following, the period of highest temperature for the day. There was 

 some variation from this, however, earlier in the season. 



Fourth-brood larvae were found leaving the fruit on September 23, 

 after a feeding period of 28 days. Larvae of this brood persisted as 

 late as October 21 in the rearing shelter, and the last collection from 

 bands in orchards showed larvae to be present as late as November 1. 



The wintering larvae of 1913, as illustrated in figure 17, were com- 

 posed of 7.16 per cent of the larvae of the first brood; of 19.98 per 

 cent of the larvae of the second brood; of 75.06 per cent of larvae of 

 the third brood; and of 100 per cent of the fourth brood. 



The feeding period of wintering larvae of the first brood in 1913 

 was 0.68 day longer than the corresponding period for the transform- 

 ing larvae of the same brood. Wintering larvae of the second brood 

 fed 1.94 days longer than transforming larvae of this brood, while the 

 length of feeding period of wintering larvae of the third brood exceeded 

 that of the transforming larvae by 1.1 days. 



The probable effect of sudden changes of temperature on the activi- 

 ties of the codling moth is illustrated in figure 8. Temperature 

 records also accompany figure 1. 



Successful band records were made during 1913 at Roswell, Artesia, 

 Lincoln, and Santa Fe. From available data the conclusion is drawn 

 that at Lincoln there occur two full generations and a partial third, 

 while at Santa Fe, a more northerly location, there appears to be 

 but one complete generation, followed by a partial second. 



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