66 



BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. 



In 1920, five cages of moths were used and, as shown in Table 55, 

 the majority of the eggs, 54.18 per cent, were deposited between 

 6 p. m. and 9 p. m., and 88.47 per cent were deposited between 3 p. m. 

 and 9 p. m. 



Table 55. 



■Time of oviposition by codling moths of the first brood, in 8-hour periods, 

 Yakima, Wash., 1920. 



Hour of 

 observation. 



6 a.m.. 

 9a.m.. 

 12 noon. 

 3p.m.. 

 6 p.m.. 

 9p.m.. 

 12 mt... 



Total. 



Date of oviposition. 



Aug. 9 



Aug. 10 



255 



Aug. 11 



138 



Aug. 12 



Aug. 13 



185 



Aug. 14 







2 



24 



37 



324 



512 



46 



67. 50 

 80-00 

 90.67 

 93.00 

 85.33 

 74-83 

 73.67 



0.00 

 021 

 2.54 

 3.92 

 34.29 

 54.18 

 4.87 



Total number of eggs on foliage 676 



Total number of eggs on cages 269 



Percent of eggs on foliage 71.53 



In 1921, this study was again made with first-brood moths, five 

 cages being used. As in 1920, the majority of the eggs, 54.68 per 

 cent, were deposited between 6 p. m. and 9 p. m., and 89.35 per cent 

 were deposited between 3 p. m. and 9 p. m. (See Table 56.) 



Table 56. — Time of oviposition by codling moths of the first brood, in 3-hour periods, 



Yakima, Wash., 1921. 





Date of oviposition. 



Total 

 eggs. 



Aver- 

 age 

 tem- 

 pera- 

 ture 



Per 



cent 



of eggs 



per 

 3-nour 

 period. 



Hour of observation. 



Aug. 2 



Aug. 3 



Aug. 4 



Aug. 5 





Num- 

 ber of 

 eggs. 



Tem- 

 pera- 

 ture. 



Num- 

 ber of 



eggs. 



Tem- 

 pera- 

 ture. 



Num- 

 ber of 

 eggs. 



Tem- 

 pera- 

 ture. 



Num- 

 ber of 

 eggs. 



Tem- 

 pera- 

 ture. 







 

 

 

 199 

 310 

 1 



68 

 77 

 86 

 88 

 79 

 70 

 65 





 

 

 13 

 67 

 47 

 2 



60 

 71 

 80 

 82 

 77 

 65 

 61 





 

 8 

 78 

 210 

 174 

 



60 

 69 

 80 

 82 

 80 

 67 

 61 





 



11 



3 



35 

 275 



41 



56 

 70 

 82 

 86 

 85 

 71 

 69 





 

 19 

 94 

 511 

 S06 

 44 



61.00 

 71.75 

 82.00 

 84.50 

 80.25 

 68.25 

 64.00 



0.00 



9 a. m 



0.00 





1.29 





6.38 



6 p. m 



34.67 



9p. m 



54.68 



12 mt 



2.98 







Total 



510 





129 





470 





365 





1,474 













Total number of eggs on foliage 776 



Total number of eggs on cages 69S 



Per cent of eggs on foliage 52. 65 



