20 



BULLETIN 429, U. S. DEPARTMENT OF AGRICULTURE. 



The time of oviposition in orchards may be determined with fair 

 precision from the combined data on the habits of the moths hi 

 captivity and from the results of the rearing experiments. 



In conducting the experiments, the results of which are shown in 

 Table XX, eggs of the codling moth were readily obtained by con- 

 fining a number of moths together hi cages. It is not possible by 

 this method to determine the number of eggs thus produced, but the 

 time and period of egg deposition can be ascertained. 









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Fig. 3. — Emergence curve of codling moths of the second brood, Roswell. N. Mex., 1912. (Original.) 



The results show the average length of time from emergence of moths 

 until first oviposition to be 2.2 days; maximum, 4 days; mhiimum, 

 2 days. The average length of the period for the duration of oviposi- 

 tion was 7.1 days; maximum, 12 days; minimum, 1 day. From time 

 of emergence to last oviposition the average was 9.3 days; maximum, 

 14 days; minimum, 6 days. 



