52 



BULLETIN 1235, U. S. DEPARTMENT Of AGRICULTURE. 



LARVAE op the second brood. 



Time of hatching. — The first larvae of the second brood were recorded 

 on July 22, and worms continued to hatch until October 2. The 

 maximum number of larvae hatching in one day was 954 on August 12, 

 or 21 days after the earliest larvae appeared. No worms were hatched 

 from eggs deposited later than September 13. The time of hatch- 

 ing of second-brood eggs is found in Figure 30. 



4-jr° 



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Fig. 30.— Hatching of larvae of the second brood of the codling moth at Yakima, Wash., 1921. 



Length of feeding period of wintering larvx. — The average length of 

 the feeding period by the stock-jar method of 559 nontransforming 

 larvae of the second brood was 34.02 days. The details of this period 

 and the effect of lower temperatures from August 14 to September 

 19 in lengthening the feeding period are shown in Table 44. 



