CODLING MOTH IN COLORADO. 



91 



Table LXVII. 



-Observations of the copulatory period of codling moths of the 

 first brood, Grand Junction, Colo., 1916. 



Pair 

 No. 



Date 



moths 



emerged. 



July 24 

 July 27 

 Julv 28 

 ..do... 

 Aug. 3 

 ..do... 

 Aug. 4 

 Aug. 5 

 ..do.. . 

 Aug. 6 

 ..do.. . 

 Aug. 9 

 Aug. 10 

 Aug. 11 

 Aug. 12 

 Aug. 14 



..do 



..do... 

 Aug. 28 



Date 



found 



in copula 



July 

 Aug. 

 Julv 

 ...do. 

 Aug. 

 ...do. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Aug. 

 Sept. 



Time 



found 



la copula 



A. M. 

 7.43... 

 7.20... 

 7.13... 

 7.19... 

 6.54... 

 9.52... 

 7.29... 

 7.00... 

 7.05... 

 6.20... 

 7.45... 

 7.06... 

 7.25... 

 6.00.... 

 7.45... 

 7.20... 

 6.50... 

 7.40..., 

 7.00... 



Moths separated subsequent 

 to— 



11.40 a.m 



4.50 p. m 



12.15 p. m 



12.15p.m 



2.37 p. m 



6.00 p. m 



5.48 p. m 



4.55 p. m 



12.19 p. m 



10.09 a.m 



10.00 p. m 



2.45 p. m 



12.10 p. m 



10.40 a. m 



8.02 a. m 



11.27 a.m 



3.55 p. m 



Died previous to separation. 

 8.05 a. m 



Minimum time 

 attached. 



Hours. Minutes. 



TIME OF DAY MOTHS OVIPOSIT. 



A series of studies was inaugurated in 1915 and continued in 

 1916 to ascertain the time of day the moths deposit their eggs most 

 freely. The results of these studies are given herewith. 



Moths of the first brood, 1915. — This experiment included 11 cages 

 in which were confined a number of male and female moths. The 

 observations were made at 3 p. m., 6 p. m., 9 p. m., 12 o'clock mid- 

 night, 6 a. m., 9 a. m. and 12 o'clock noon, or, in other words, daily 

 every 3 hours except at 3 a. m. These studies were commenced at 

 12 o'clock noon August 16 and were concluded at 6 a. m. August 21. 

 At each examination the old foliage was removed and a fresh 

 supply furnished, and at the same time the number of eggs deposited 

 on the sides of the cages was recorded and the eggs removed. Some 

 eggs were deposited on the sand in the bottom of the jars, but as 

 these could not be accurately counted, they were not taken into con- 

 sideration. 



In Table LXVHI the tabulated data of the time of deposition of 

 3,621 eggs will be found in addition to the mean temperatures during 

 the periods of observation. This table has been summarized and the 

 data presented in Table LXIX, by reference to which it will be 

 noted that the great majority of the eggs were deposited between 

 12 o'clock noon and 9 p. m. The time of greatest deposition occurred 

 just before dusk, the moths being very active at this time. It is of 

 interest to note that with a mean temperature of 78.90° F. during 5 

 observation periods from 9 a. m. till 12 o'clock noon, only 2.31 per 

 cent of the eggs were laid, whereas the moths laid much more abund- 

 antly with both higher and lower mean temperatures when these 

 occurred later in the day. 



