THE CODLING MOTH IN THE YAKIMA VALLEY. 



65 



Table 53. — Time of oviposition by codling moths of the spring brood, in 3-hour 

 periods, Yakima, Wash., 1920. 



Hours of 

 observation. 



Date of oviposition. 



June 19 



June 20 



June 21 June 25 



June 26 



June 27 



<-3 



6 a. m 



9 a. m 



12 noon 



3p. m 



6p. m 



9p. m 



12 midnight . . . 

 Total.... 











20 



68 



124 



85 



6 



67.17 

 69. 33 

 78.00 

 79.67 

 75.17 

 63.67 

 68.67 



0.00 

 0.00 

 6.60 

 22.44 

 40.92 

 28.05 

 1.98 



Total number of eggs on foliage 246 



Total number of eggs on cages 57 



Per cent of eggs on foliage 81.19 



These tables demoostrate that the spring brood of moths deposit 

 a great majority of their eggs between 3 p. m. and 9 p. m. A com- 

 parison of the temperatures with the number of eggs deposited shows 

 that very few eggs are deposited when the temperature is below 60° F. 

 For example, in Table 53, no eggs were deposited on June 25 between 

 6 p. m. and 9 p. m., the temperature being 61° F. at 6 p. m. and 

 51° F. at 9 p. m. On the other hand, high temperatures do not 

 necessarily cause the moths to oviposit, the maximum oviposition 

 occurring nearly always after the maximum temperature for the day 

 has been reached. 



Moths of the first brood. — In 1919, six cages of moths were used 

 for 3-hour oviposition records, the data secured from this study being 

 shown in Table 54. The maximum oviposition occurred between 

 3 p. m. and 6 p. m., 41.20 per cent of the eggs being laid during this 

 time, and between noon and 6 p. m., 79.27 per cent of the eggs were 

 deposited. With one exception, no eggs were deposited between 

 midnight and 9 a. m. 



Table 54. — Time of oviposition by codling moths of the first brood, in 3-hour periods, 



Yakima, Wash., 1919. 



Hour of 



observation. 



Date of oviposition. 



BO 

 BO 

 © 



"3 



o 

 Eh 



1 



2 



© 



ft 



a 



© 



© 



BO 



03 

 M 

 © 



> 

 < 



© 



July 31 



Aug. 1 



Aug. 2 



Aug. 3 



Aug. 4 



Aug. 5 



Aug. 6 



B0^ 



©73 

 © 



-ft 



a 2 



©A 



CO 

 M 



© 



Ah 



BO 



so 



© 



o 



© 

 .a 



© 



H 



"3 



M 



© 



ft 



a 

 © 



BO 



BD 

 © 



"3 



1 



© 



03 

 M 



© 

 ft 



BO 



to 



© 



o 



© 



1 



© 



r- 

 © 

 ft 



a 

 © 



be 



bo 



© 



o 



© 



a 



© 



03 

 © 



ft 



a 

 © 



BO 

 BO 



© 



o 



a 



3 



© 



a 



03 



© 



a 

 © 



Eh 



BO 

 BO 

 © 



o 



Li 



© 



a 



3 



© 

 M 

 3 



03 

 M 



ft 



a 

 © 



EH 



BO 

 BD 



© 



O 

 © 



fit 



a 



© 



3 



"3 



ft 



a 

 © 











 



90 

 341 



36 

 4 



64 

 73 

 83 

 88 

 72 

 64 

 62 



1 







2 



404 



170 



30 







67 

 66 

 78 

 83 

 77 

 65 

 62 















47 



89 



48 



1 



60 

 69 

 78 

 81 

 79 

 65 

 63 





 



26 

 100 



69 

 6 

 



59 

 68 

 76 

 74 

 65 

 63 

 60 





 

 

 104 

 54 

 1 

 



55 

 67 

 73 

 73 

 69 

 62 

 69 





 

 5 

 34 

 94 

 89 

 3 



56 

 71 

 79 

 83 

 81 

 69 

 67 





 

 

 



26 

 157 



15 



62 



n 



88 

 91 

 90 

 77 

 74 



1 







33 



779 



843 



367 



23 



59.00 

 69.71 

 79-29 

 81-86 

 76.14 

 66. 43 

 63.86 



0.05 





0-00 





1.61 

 38.07 





41.20 





17.94 



2mt 



1.12 



Total.... 





471 





607 





185 





201 







159 





225 





198 



.... 



2,046 











'otal number of eggs on foliage. 

 'otal number of eggs on cages. . 

 'er cent of eggs on foliage 



1,382 



664 



67.55 



74366°— 24- 



