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. 





Date of oviposition. 





CO 



3 



o 



a, 





June 19 



June 20 



June 21 



June 25 



June 26 



June 27 



CO • 



fcCO 



































CO 





CO 













co 





co 











Hours of 





o 







tuO 









6X1 



CO 



W) 







ft 



% S- 



observation. 



o 



3 



CO 



* 



o> 





<d 





o> 



3 



*- 







| 



J 













o 











c 















CD 



<3 

 ft 



3 

 5 



2 

 ft 



u 



CD 



08 



CD 



2 



o 



ft 



•- 

 CD 



CD 



CO 



X2 



CD 

 ft 



o 



CS 



- o 





9 



a 



5 



Q 



a 



a 



a 



a 



3 



a 



d 



a 



OJ 



g 







































A 



H 



fc 



H 



fc 



e 



A 



H 



K 



H 



A 



H 



e 



«i 



~ 









n 



5fi 



6* 





 



55 





 



60 

 7< 





 



54 

 04 







n 



52 

 66 





 



6/ 

 75 





 



57.17 



00 



9 a. m 



0.00 



12 noon 



2 



2 



28 



78 

 80 

 77 





 13 

 26 



79 



79 

 7$ 







1 



10 



89 

 92 



81 



8 

 15 



65 

 67 

 61 



10 

 31 



24 



75 

 78 

 78 





 6 



31 



78 

 82 

 81 



20 

 68 

 124 



78.00 

 79. 67 

 76.17 



6 60 



3 p. m 



22.44 



6p. m 



40.92 



9p. m 



66 

 5 



64 

 60 



1 

 



61 



50 



5 

 



70 



64 





 



61 



50 



4 



1 



65 



63 



9 

 



71 

 65 



85 

 6 



6 >'. 87 

 68.67 



28.05 



12 midnight 



1.98 



Total 



103 





40 





16 





28 





70 





46 





303 











Total number of eggs on foliage 246 



Total number of eggs on cages 57 



Per cent of eggs on foliage 81.19 



These tables demonstrate 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 8-hour periods, 

 Yakima, Wash., 1919. 



Hour of 

 observation. 



Date of oviposition. 



July 31 Aug. 1 



Aug. 2 



Aug. 3 



Aug. 4 



Aug. 5 



Aug. 6 



cdt: 



CD 



-a 



a o 















12 noon 



3 p. m 





 90 



6p. m 



341 





36 



12 mt 



4 







Total.... 



47L 



81 





 

 26 

 L00 

 69 

 6 

 " 

 201 



[59 











5 



34 



94 



89 



3 



225 



<;; 



l 

 o 



33 

 779 

 843 

 367 



23 



59.00 



69.71 

 79-29 

 81-86 

 76.14 

 66. 43 

 88.86 



...2,046 



0.05 



0.00 



1.61 



38.07 



41.20 



17.94 



1.12 



Total number of eggs on foliage. 

 Total number of eggs on cages.. 

 Per cent of eggs on foliage 



1,382 



664 



67.55 



74366°— 24- 



