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. 



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 larvae of the second brood of the codling 

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







Feeding period in davs. 





Feeding period in 



davs. 



Date of 

 entering 



Num- 

 ber of 









Date of 

 entering 



Num- 

 ber of 





















fruit. 



larvae. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



fruit. 



larvae. 



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. SI 



66 



20 



27 



2 



30.00 



38 



22 



16 



10 



39.90 



67 



31 



28 





39.29 



53 



23 



17 



12 



34.50 



56 





29 



13 



29.08 



56 



21 



19 



3 



39.00 



46 



35 



30 



13 



28.85 



43 



22 



20 



6 



37.00 



53 



l."> 



Aug. 1 





28.20 



36 



23 



21 







44.60 



52 



36 



2 



8 



29.00 



39 



22 



22 



4 



52. 50 



Oi 



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 



n. 75 



5-4 



38 



8 



36 



33. 75 



57 



19 



28 



4 



54.00 



61 



49 



9 



16 



3S.31 



62 



22 



80 



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 













*}07 



Total number of larvae .. ' p 



Average lengl h of feeding period in days ** °* 



M aadmum length of feeding period In days «» 



Mininum length of feeding period in days xo 



