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 



14 



3S0 

 390 

 330 

 320 

 310 

 300 

 290 

 280 

 2 70 

 260 

 250 

 290 

 230 

 220 

 210 

 200 



180 

 170 

 160 

 ISO 

 190 

 130 

 120 



100 

 30 

 80 

 70 



eo 



so 



90 

 30 

 20 

 10 



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!»^B«lOs^l^l»lo»^^l»l0^ l ^l l, )* l| )'o^^lll>Ol^«(1* , o»^ l >l"lO^ , >l | 1*^ lo ^''> l ^ l ''""^^y^ | Il«lO il^ "\i "> * *> 



Fig. 



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



(Original.) 



elapsed from time of emergence 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 female 

 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. 



