28 



BULLETIN 1235, IT. S. DEPARTMENT OF AGRICULTURE. 



Table 23. — Length of feeding period of larvse of the first brood of the codling moth, 

 bagged-fruit method, Yakima, Wash., 1920. 



Date of 



entering 



fruit. 



Num- 

 ber of 

 larvae. 



Feeding period in days. 



Date of 



entering 



fruit. 



Num- 

 ber of 

 larvse. 



Feeding period in days. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



June 24 

 26 

 27 

 28 

 29 



9 

 5 

 3 

 4 

 10 



21.22 

 19.00 

 20.00 

 18.25 

 19.50 



26 

 23 

 26 

 19 



24 



18 

 16 

 15 



17 

 14 



June 30 



July 1 



2 



3 



4 

 14 

 4 

 4 



17.25 

 21.57 

 20.50 

 22.25 



20 

 28 

 24 

 24 



15 

 17 

 18 

 20 



Total number of larvse 57 



Average length of feeding period in days 20. 28 



Maximum length of feeding period in days 28 



Minimum length of feeding period in days 14 



Length of cocooning period. — The cocooning period, or the total 

 period from the time the larva leaves the fruit until it pupates, aver- 

 aged 5.48 days for 235 transforming individuals. (See Table 24.) 



Table 24. — Length of cocooning period of transforming codling moth larvse of the 

 first brood, Yakima, Wash., 1920. 



Larvse left 

 fruit. 



Num- 

 ber of 

 larvse. 



Cocooning period 



in days. 



Larvse left 

 fruit. 



Num- 

 ber of 

 larvse. 



Cocooning period in days. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



July 6 



1 



4.00 



4 



4 



July 24 



4 



5.00 



7 



4 



7« 



3 



4.33 



5 



4 



25 



8 



7.00 



15 



4 



8 



4 



5.25 



7 



4 



26 



5 



6.40 



14 



4 



9 



7 



5.57 



6 



. 5 



27 



6 



6.50 



13 



4 



10 



11 



5. 55 



7 



5 



28 



3 



6.33 



8 



5 



11 



12 



5.42 



6 



5 



29 



6 



5.17 



8 



4 



12 



9 



5.11 



6 



4 



30 



4 



5.50 



8 



3 



13 



16 



4.13 



5 



4 



31 



3 



4.00 



4 



4 



14 



8 



4.63 



8 



4 



Aug. 1 



5 



5.60 



11 



4 



15 



14 



5.29 



15 



3 



2 



3 



4.33 



5 



4 



16 



14 



4.86 



7 



4 



3 



1 



5.00 



5 



5 



17 



10 



4.60 



6 



3 



4 



1 



10.00 



10 



10 



18 



20 



5.55 



9 



3 



6 



1 



4.00 



4 



4 



19 



16 



6.31 



16 



4 



7 



1 



5.00 



5 



5 



20 



11 



6.18 



10 



5 



11 



1 



4.00 



4 



4 



21 

 22 



10 

 6 



5.70 

 5.83 



7 

 10 



4 

 4 













Total. 



235 



5.48 



22 



3 



23 



11 



6.91 



22 



4 













26 



9 /4- /9 24- 29 c? 8 ' /3 /8 



Fig. 16.— Pupation of the first brood of the codling moth at Yakima, Wash., 1920. 



