26 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



Table 21. — Time of de-position 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. 



Date of 

 deposi- 



Num- 

 ber 01 



Red ring. 





Black spot 











tion. 



eggs. 





















Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 







age. 



mum. 



mum. 



age. 



mum. 



mum. 



age. 



mum. 



mum. 



May 31 



8 



4.00 



4 



4 



9.00 



9 



9 



12.13 



13 



12 



June 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 



14. 75 



15 



14 



5 



27 



5.00 



5 



5 



11.30 



12 



11 



13.30 



14 



*1? 



6 



59 



5.00 



5 



5 



11.00 



11 



11 



13.07 



14 



13 



7 



10 



6.00 



6 



6 



11.00 



11 



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 

 16 



55 

 35 



4.00 



4 

 4 



4 

 4 



8.07 

 8.00 



9 



8 



8 

 8 



11.00 

 10.89 



12 

 11 



10 

 10 



4.00 



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 



4 



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 



LARVAE 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 larvae 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 larvae (both transforming and nontransforming) by 

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



