THE CODLING MOTH IN THE YAKIMA VALLEY. 



51 



Length of incubation. — The length of the incubation period of 5,342 

 eggs of the second brood, the number of days from deposition to the 

 appearance of the red ring, and the number of d&ys from deposition 

 to the appearance of the black spot are given in Table 43. The 

 incubation period of eggs which were deposited after August 30 was 

 about three times as long as required by eggs which hatched in 

 July and early August. This is due to daily average temperatures 

 generally below 60° F. 



43.- 



-Time of deposition and length of incubation of eggs of the second brood 

 of the codling moth, Yakima, Wash., 1921. 



Date of 

 deposi- 



Num- 

 ber of 



Number of days from deposition to 



appearance of— 



Incubation period 



in days. 





Red ring. 





Black spot 











tion. 



eggs. 















Aver- 



Maxi- 



Mini- 



















Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



age. 



mum. 



mum. 







age. 



mum. 



mum. 



age. 



mum. 



mum. 









July 15 



31 



3.00 



3 



3 



6.00 



6 



6 



7.03 



S 



7 



17 



6 



2.00 



2 



o 



G.00 



6 



6 



7.17 



8 



7 



18 



23 



3.00 



3 



3 



6.00 



6 



6 



7.09 



8 



7 



20 



4 



3.00 



3 



3 



5.00 



5 



5 



6.50 



7 



6 



21 



19 



3.00 



3 



3 



5.00 



5 



5 



6.16 



7 



6 



22 



11 



3.00 



3 



3 



6.00 



6 



6 



7.00 



7 



7 



23 



124 



3.00 



3 



3 



5.00 



5 



5 



6.77 



7 



6 



24 



132 



3.00 



3 



3 



6.00 



6 



6 



6.92 



7 



6 



25 



64 



3.00 



3 



3 



5.00 



5 



5 



6.34 



7 



6 



26 



41 



3.00 



3 



3 



5.00 



5 



5 



6.46 



7 



6 



27 



45 



3.00 



3 



3 



5.00 



5 



5 



6.22 



7 



6 



28 



93 



3.00 



3 



3 



5.00 



5 



5 



6.10 



7 



6 



29 



120 



3.00 



3 



3 



5.00 



5 



5 



6.17 



7 



6 



30 



242 



3.00 



3 



3 



5.00 



5 



5 



6.98 



7 



6 



31 



352 



2.00 



2 



2 



6.00 



6 



6 



7.00 



7 



7 



Aug. 1 



183 



2.00 



2 



2 



5.00 



5 



5 



6.52 



7 



6 



2 



210 



2.00 



2 



2 



6.00 



6 



6 



7.00 



7 



7 



3 



19 



2.00 



2 



2 



5.00 



5 



5 



6.00 



6 



6 



4 



198 



2.00 



2 



2 



5.00 



5 



5 



6.00 



6 



6 



5 



200 



2.00 



2 



2 



5.00 



5 



5 



6.33 



7 



6 



6 



456 



2.00 



2 



2 



5.00 



5 



5 



6.00 



6 



6 



7 



511 



3.00 



3 



3 



5.00 



5 



5 



6.32 



8 



6 



8 



470 



2.00 



2 



2 



5.00 



5 



5 



6.00 



6 



6 



9 



243 



2.00 



2 



2 



5.00 



5 



5 



6.28 



7 



5 



10 



144 



2.00 



2 



2 



5.19 



6 



5 



6.19 



7 



6 



11 



180 



2.00 



2 



2 



6.00 



6 



6 



7.58 



8 



7 



12 



60 



2.00 



2 



2 



6.00 



6 



6 



8.00 



8 



8 



13 



61 



2.00 



2 



2 



7.00 



7 



7 



8.00 



8 



8 



14 



192 



3.00 



3 



3 



7.00 



7 



7 



9.09 



10 



8 



15 



53 



3.00 



3 



3 



7.00 



7 



7 



9.21 



10 



8 



16 



60 



3.00 



3 



3 



8.38 



9 



8 



10.42 



12 



9 



17 



24 



3.00 



3 



3 



8.00 



8 



8 



10.29 



11 



10 



18 



37 



3.00 



3 



3 



8.00 



8 



8 



9.24 



10 



9 



19 



38 



3.00 



3 



3 



8.00 



8 



8 



9.42 



10 



9 



20 



69 



3.00 



3 



3 



8.00 



8 



8 



9.64 



10 



9 



21 



55 



3.00 



3 



3 



8.00 



8 



8 



9.58 



10 



9 



22 



52 



3.00 



3 



3 



8.00 



8 



8 



9.33 



11 



9 



23 



54 



3.00 



3 



3 



8.00 



8 



8 



10.07 



11 



9 



24 



42 



3.00 



3 



3 



8.00 



8 



8 



10.43 



11 



10 



25 



20 



3.00 



3 



3 



8.00 



8 



8 



11.25 



13 



10 



26 



3 



4.00 



4 



4 



9.00 



9 



9 



11.00 



11 



11 



27 



53 



4.00 



4 



4 



9.00 



9 



9 



11.30 



12 



11 



29 



18 



4.00 



4 



4 



10.00 



10 



10 



16.11 



17 



15 



30 



71 



4.00 



4 



4 



14.00 



14 



14 



17.41 



18 



16 



31 



15 



6.00 



6 



6 



15.00 



15 



15 



17.67 



19 



17 



Sept. 1 



45 



6.00 



6 



6 



14.13 



15 



14 



17.13 



IS 



17 



2 



26 



6.00 



6 



6 



15.00 



15 



15 



17.35 



18 



17 



3 



44 



5.00 



5 



5 



15.00 



15 



15 



17. 66 



19 



16 



4 



34 



4.00 



4 



4 



14.00 



14 



14 



17.35 



19 



17 



5 



IS 



6.00 



6 



6 



15.00 



15 



15 



18.44 



19 



17 



6 



35 



6.00 



6 



6 



15.00 



15 



15 



19.00 



20 



18 



7 



20 



6.00 



6 



6 



17.00 



17 



17 



19. 95 



21 



IS 



8 



12 



7.00 



7 



7 



18.00 



18 



18 



21.83 



23 



20 



9 



7 



8.00 



8 



8 



18.00 



18 



18 



21.43 



23 



20 



10 



3 



9.00 



9 



9 



18.00 



18 



18 



21.00 



21 



21 



5,342 



2.64 



9 



2 



6.23 



18 



5 



7.70 



23 



5 



