THE CODLING MOTH IN THE YAKIMA VALLEY. 



35 



Table 32. — Length of feeding period of larvae 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 

 31.80 

 36.22 

 33.33 



60 

 42 

 43 

 37 

 54 

 43 



23 

 26 

 25 

 23 

 26 

 25 



Aug. 13 

 14 

 15 

 16 

 17 

 18 



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 



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Fig. 19.— Hatching of larvss 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 larvse being col- 

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

 trees were banded, and although these trees were sprayed and 



