26 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



Table 21. — Time of deposition and length of incubation of eggs of the first brood 

 of the codling moth, Yakima, Wash., 1920. 







Number of days from deposition to appearance of— 























Incubation 



in days. 



Hate of 

 deposi- 



Num- 

 ber of 





Red ring. 





Black spot 











tion. 



eggs. 





















Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 







age. 



mum. 



mum. 



age. 



mum. 



mum. 



ago. 



mum. 



mum. 



May 31 



8 



4.00 



4 



4 



9.00 



9 



9 



12.13 



13 



12 



Juno 1 



3 



4.00 



4 



4 



10.00 



10 



10 



12.33 



13 



12 



3 



5 



4.00 



4 



4 



11.00 



11 



11 



13.20 



14 



13 



4 



12 



5.00 



5 



5 



12.00 



12 



12 



It. 75 



15 



14 



5 



27 



5.00 



5 



5 



11.30 



12 



11 



13.30 



14 



t! 



6 



59 



5.00 



5 



5 



11.00 



11 



11 



13.07 



14 



13 



7 



10 



6.00 



6 



6 



11.00 



H 



11 



12.60 



13 



12 



8 



108 



5.10 



6 



5 



10.10 



11 



10 



12.49 



14 



12 



9 



104 



5.00 



5 



K 



10.00 



10 



10 



11.61 



12 



11 



10 



39 



5.00 



5 



5 



10.00 



10 



10 



11.00 



11 



11 



11 



4 



5.00 



5 



5 



9.00 



9 



9 



10.75 



11 



10 



12 



28 



5.00 



5 



5 



9.00 



9 



9 



10.25 



11 



10 



13 



46 



5.00 



5 



5 



8.20 



9 



8 



11.04 



12 



10 



14 



18 



4.00 



4 



4 



8.11 



9 



8 



11.00 



12 



10 



15 



55 



4.00 



4 



4 



8.07 



9 



8 



11.00 



12 



10 



16 



35 



4.00 



4 



4 



8.00 



8 



8 



10.89 



11 



10 



17 



34 



3.00 



3 



3 



8.18 



11 



8 



11.24 



13 



11 



18 



175 



3.00 



3 



3 



9.04 



10 



9 



10.17 



12 



10 



19 



31 



4.00 



i 



4 



9.16 



10 



9 



10.35 



12 



10 



20 



61 



3.00 



3 



3 



8.02 



9 



8 



9.54 



11 



9 



21 



23 



5.00 



5 



5 



8.00 



8 



8 



9.30 



10 



9 



22 



1 



5.00 



5 



5 



8.00 



8 



8 



9.00 



9 



9 



24 



3 



5.00 



5 



5 



6.00 



6 



6 



7.33 



8 



7 



25 



5 



4.00 



4 



4 



6.00 



6 



6 



7.20 



8 



7 



26 



28 



4.00 



4 



4 



5.00 



5 



5 



6.36 



7 



6 



27 



13 



4.00 



4 



4 



5.00 



5 



5 



6.00 



6 



6 



. 28 



4 



4.00 



4 



4 



5.00 



5 



5 



6.25 



7 



6 



29 



10 



3.00 



3 



3 



4.00 



4 



4 



6.20 



7 



6 



30 



2 



3.00 



3 



3 



4.00 



4 



4 



6.50 



7 



6 



July 1 



1 



3.00 



3 



3 



5.00 



5 



5 



6.00 



6 



6 



2 



25 



2.00 



2 



2 



4.00 



4 



4 



6.04 



7 



6 



3 



3 



2.00 



2 



2 



5.00 



5 



5 



6.00 



6 



6 



4 



18 



4.00 



4 



4 



5.00 



5 



5 



6.06 



7 



6 



6 



5 



3.00 



3 



3 



4.80 



5 



4 



5.80 



6 



5 



7 



7 



4.00 



4 



4 



5.57 



6 



5 



7.00 



7 



7 



1,010 



4.14 



6 



2 



8.75 



12 



4 



10.60 



15 



5 



LARV.E OF THE FIRST BROOD. 



Time of hatching. — The earliest larvae hatched June 12 and hatch- 

 ing continued until July 14, a total period of 33 days, as shown in 

 Figure 15. Most of the larva? hatched from June 19 to 29, inclusive, 

 with a maximum on June 28, 16 days after the first larva hatched. 

 The maximum occurred 10 days later than in 1919, and the total 

 hatching period was 10 days longer than in 1919. 



Length of feeding period, stock-jar method. — The average feeding 

 period of 268 larva? (both transforming and non transforming) by 

 the stock-jar method was 19.05 days. (See Table 22.) 



