18 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



LARVAE of the second brood. 



Time of hatching. — Second-brood, larvae were hatching for more than 

 two months, beginning July 22, reaching a maximum August 7 and 

 continuing until September 27. A reference to Figure 8 will show 

 that the maximum period of hatching was much more prolonged 

 than was the case with the first brood of larvae. 



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2GO 



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/& /j£ <?0 .2* JO 





Fig. 8.— Hatching of larvae of the second brood of the codling moth at Yakima, Wash., 1919. 



Length of feeding 'period, stock-jar method. — Table 15 shows data of 

 327 larvae of the second brood, reared by the stock-jar method. 



Table 15. — Length of feeding 'period of larvse of the second brood of the codling 

 moth, stock-jar method, Yakima, Wash., 1919. 







Feeding period in days. 







Feedin 



g period in 



days. 



Date of 

 entering 



Num- 

 ber of 









Date of 

 entering 



Num- 

 ber of 





















fruit. 



larvse. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



fruit. 



larvse. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



July 22 



3 



26.00 



32 



22 



Aug. 14 



7 



24.71 



26 



22 



25 



4 



37.25 



69 



26 



15 



16 



32.81 



66 



20 



27 



2 



30.00 



38 



22 



16 



10 



39.90 



67 



31 



28 



7 



39.29 



53 



23 



17 



12 



34.50 



56 



27 



29 



13 



29.08 



56 



21 



19 



3 



39.00 



46 



35 



30 



13 



28.85 



43 



22 



20 



6 



37.00 



53 



15 



Aug. 1 

 2 



5 



28.20 



36 



23 



21 



5 



44.60 



52 



36 



8 



29.00 



39 



22 



22 



4 



52.50 



57 



47 



3 



4 



26.50 



28 



24 



23 



5 



44.20 



60 



27 



4 



4 



30.50 



38 



25 



24 



2 



47.00 



47 



47 



5 



8 



29.63 



43 



19 



25 



2 



49.50 



56 



43 



6 



12 



34.75 



61 



23 



26 



2 



59.00 



63 



55 



7 



37 



29.62 



40 



20 



27 



4 



44.75 



54 



38 



8 



36 



33.75 



57 



19 



28 



4 



54.00 



61 



49 



9 



16 



38.31 



62 



22 



30 



1 



51.00 



51 



51 



10 



15 



37.67 



46 



28 



31 



1 



52.00 



52 



52 



11 



12 



35.58 



56 



19 



Sept. 4 



1 



22.00 



22 



22 



12 



21 



34.81 



51 



16 



7 



1 



39.00 



39 



39 



13 



21 



33.10 



50 



21 













Total number of larva? qa. ?I 



Average length of feeding period in days m 



Maximum length of feeding period in days !?e 



Mininum length of feeding period in days 10 



