THE CODLING MOTH IN THE YAKIMA VALLEY. 



63 



Moths of the first brood. — Hourly emergence of first-brood moths 

 was observed in 1919 from July 21 to 23, inclusive, 138 moths being 

 recorded. Table 50 shows that more moths emerged between 8 

 and 9 a. m. than during any other hour. 



Table 50. 



Hourly emergence of codling moths of the first brood from 

 6 p. m., inclusive, Yakima, Wash., 1919. 



a. m. to 









Number of moths emerging at— 









! 



















Total 

 num- 

 ber of 



Date of 

 emergence 

 of moths. 



A. M. 





P. 



M. 









6 



7 



8 



9 ' 



10 



11 



12 



1 



2 



3 



4 



5 



6 





July 21 



July22 



July23 



1 



1 

 4 



1 

 1 

 



14 

 

 



13 

 13 



4 



9 

 13 

 



4 

 11 

 8 



4 

 2 

 5 



3 

 3 



1 



3 

 5 



6 



4 

 1 

 1 



2 





 









 



1 

 

 



59 

 50 

 29 



Total.. 

 Percent 



6 

 4.3 



2 



1.5 



14 

 10.1 



30 

 21.7 



22 

 15.9 



23 



16.7 



11 

 8.0 



7 

 5.1 



14 

 10.1 



6 

 4.3 



2 

 1.4 





 0.0 



1 

 0.7 



138 

 



In 1920, observations were made from August 9 to 14, inclusive, 

 Table 51 showing that of 234 moths the largest number emerged 

 between 12 noon and 1 p. m. The emergence period of first-brood 

 moths covers more hours of the day than in the case of the spring 

 brood. In 1919, 64.4 per cent of the moths emerged between 7 

 a. m. and 11 a. m. In 1920, the emergence was even more prolonged, 

 and in order to total up a comparable number of moths it is necessary 

 to include all moths emerging between 10 a. m. and 4 p. m., between 

 which hours 67.7 per cent of the moths emerged. In all cases, a 

 majority of the moths emerged before the maximum temperature for 

 the day was reached. 



Table 51. — Hourly emergence of codling moths of the first brood from 6 a. m. to 

 6 p. m., inclusive, Yakima, Wash., 1920. 



Date of 

 emergence 

 of moths. 











Number of moths emerging at — 











Total 

 num- 

 ber of 



A. M. 



P.M. 



6 



7 



8 



9 



10 



11 



12 



1 



2 



3 



4 



5 



6 





Aug. 9 



Aug. 10 



Aug. 11 



Aug. 12 



Aug. 13 



Aug. 14 





 

 2 

 1 

 3 

 4 







1 

 

 

 



1 







1 

 



1 



1 



5 



1 

 

 4 

 1 

 2 

 7 



1 

 

 1 

 

 

 6 



2 

 

 5 

 2 

 6 

 9 



2 

 1 

 2 

 2 

 2 

 4 



11 

 4 

 6 

 7 



11 

 9 



9 

 6 

 

 1 



7 

 1 



4 

 5 

 4 

 5 

 6 

 1 



3 

 5 

 1 

 4 

 11 

 





 9 

 1 

 5 

 4 

 





 

 

 5 

 7 

 2 



33 

 32 

 26 

 34 

 60 

 49 



Total.. 

 Percent 



10 

 4.3 



2 

 0.9 



8 

 3.4 



15 

 6.4 



8 

 3.4 



24 



10.3 



13 

 5.6 



48 

 20.5 



24 

 10.3 



25 

 10.7 



24 

 10.3 



19 

 8.1 



14 

 5.9 



234 



TIME OF DAY MOTHS OVIPOSIT. 



It is of some importance to know the time of day most of the 

 codling moth eggs are deposited and the effect of varying degrees 

 of temperature on egg deposition. It is particularly important 

 to know the effect of temperature on the deposition of eggs by 



