CODLING MOTH IN COLORADO. 



93 



Table LXIX. — Time of ovi position by codling moths of the first brood; observa- 

 tions taken daily every three hours, except at 3 a. m.; Grand Junction, Colo., 

 1915; summary of Table LXYIII. 



Num- 

 ber of 

 obser- 

 vation 

 periods. 







Average 



Per cent 



Mean 





Total 



number 



of eggs 



tempera- 



Period of 



number 



of eggs 



deposited 



ture dur- 



observation . 



of eggs 



per op- 



per ovi- 



ing 0V1- 





deposited. 



position 



position 



position 







period. 



period. 



periods. 



5 



12 mt. to 6 a. m 



7 



1.40 



0.19 



°F. 

 59.00 



4 



6 a. m. to 9 a. m... 



24 



6.00 



.83 



64.56 



5 



9 a.m. to 12m 



85 



17.00 



2.34 



78.90 



5 



12 m. to 3 p. m 



598 



119.60 



16.49 



87.15 



5 



3 p. m. to6 p. m... 



1,375 



275. 00 



37.91 



85.10 



5 



6p. m. to9p. m... 



1,492 



298. 40 



41.14 



73.70 



5 



9 p. m. to 12 mt 



40 



8.00 



1.10 



64.00 



m=noon: mt. =rnidnight. 



Moths of the spring hrood, 1916. — The study of the time of op- 

 position by moths of the spring brood was commenced at 12 o'clock 

 noon on June 5 and the observations were made daily every 3 hours, 

 except at 3 a. m., until 12 o'clock noon June 12, a period of one week. 

 The details of this study are presented in Table LXX and sum- 

 marized in Table LXXL By reference to the latter it will be noted 

 that over 79 per cent of the eggs were deposited from 3 p. m. to 9 

 p. m. It will be seen in the table that the mean temperature for the 

 7 days from 9 a. m to 12 o'clock noon was 76.39° F. Although this 

 temperature is in no wise unfavorable for egg deposition, yet only 

 1.54 per cent of the eggs were deposited during this interval. Later 

 in the day, with both higher and lower mean temperatures, much 

 higher percentages of eggs were deposited. From 3 p. m. to 6 p. m. 

 58.80 per cent of the eggs were laid, the mean temperature being 

 82.92° F., or a little over 6° higher than the temperature from 9 a. m. 

 to 12 o'clock noon. From 6 p. m. to 9 p. m.. with a temperature of 

 73.14° F., 20.52 per cent of the eggs were deposited. 



