40 



BULLETIN 429, U. S. DEPARTMENT OF AGRICULTURE. 



The time and rate of emergence of the -spring brood of moths are 

 illustrated diagrammatically in figure 8. 



Egg deposition. — The records on egg deposition by individual moths 

 of the spring brood are somewhat limited, because of the 34 females 

 isolated in this connection only 9 gave results worthy of record, as 

 shown in Table XXXIV. 



• From a total deposition of 257 eggs it will be noted that the maxi- 

 mum deposition per female was 91 eggs, while the average number 

 per moth was approximately 28 eggs. On an average 7.33 days 



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1 M^Y \jUNC \ 



Fig. 8.- 



-Curve showing emergence of codling moths of the spring brood, Roswell, N. Mex., 1913. 



(Original.) 



elapsed from time of enaergence to first oviposition. The maximum 

 time, however, was 12 days; the minimum, 3 days. The length of 

 the period of oviposition for the 9 individuals under observation 

 averaged 5.55 days; the maximum was 10 days; minimum, 1 day. 

 On an average the moths in confinement lived 12.88 days, which is 

 somewhat longer than the corresponding period for the feniale 

 moths of the spring brood of 1912, which gave an average length 

 of life of 8.47 days. In 1912 the maximum length of life of female 

 moths of the spring brood was 22 days; in 1913 the corresponding 

 period was 20 days. 



