THE CODLING MOTH IN THE YAKIMA VALLEY. 



35 



Table 32. — Length of feeding period of larvx of the second 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 

 larvae. 



Feeding period in days. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Average. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aug. 7 

 8 

 9 

 10 

 11 

 12 



6 

 8 

 10 

 5 

 9 

 6 



34.17 

 33.00 

 33.00 

 31. SO 

 36.22 

 33.33 



60 

 42 

 43 

 37 



54 



43 



23 

 26 

 25 

 23 

 26 

 25 



Aug. 13 

 14 



15 



16 

 17 

 IS 



9 

 5 



15 

 6 

 11 

 16 



36.11 

 44.40 

 43.80 

 46.67 

 45.73 

 49.50 



46 

 70 

 79 

 68 

 63 

 69 



27 

 25 



32 



34 

 21 

 37 



Total number of larva 106 



Average length of feeding period in days 40. 22 



Maximum length of feeding period in days 79 



Minimum length of feeding period in days 21 



7<30 



7%? 



700 



620 



600 



S&0 



^60 



^<90 



\t\^20 



^300 



$>f&0 



XT $ 

 7-0" <J 



60' \ 



^00 

 \30O 



\320 



\300 



*2&0 



260 



2<90 



220 



200 



/<50 



/60 



/<90 



/2^0 



S00 



<30 



GO 



+0 



6 // /6 2/ 26 3/ 



^ /0 /f 20 2S 30 ^ A? 4f 

 ^/S^7lEA70£:^. 0>0T0&^j*Z~ 



Fig. 19.— Hatching of larvae of the second brood of the codling moth at Yakima, Wash., 1920. 



CODLING-MOTH BAND STUDIES OF 1920. 



In 1920 trees were again banded in both the Guthrie orchard at 

 Yakima and the Walden orchard near Buena, the larvae being col- 

 lected every three days, as in 1919. In the Guthrie orchard, 29 

 trees were banded, and although these trees were sprayed and 



