CODLING MOTH IN COLORADO. 



59 



Moths of the First Brood. 



Time of emergence. — As in the studies of 1915 (p. 24), a record 

 was kept of the time of emergence of first-brood moths reared from 

 insectary-bred material in order to determine the approximate limits 

 of the brood. In Table XL it will be noted that 829 moths issued 

 from July 5 to August 19, inclusive; the same data are presented 

 graphically with temperatures in figure 23. Records were also taken 

 of the time of emer- 

 gence of the moths 

 that issued from the 

 larvae collected every 

 three days in the Ham- 

 ilton and Edwards or- 

 chards. The moths 

 that issued up to Au- 

 gust 13, inclusive, were 

 used for oviposition 

 purposes in preference 

 to those from the in- 

 sectary-bred material, 

 because their rate of 

 emergence corre- 

 sponded more closely 

 to that which would 

 have occurred in the 

 field. These data are given in Table XLI and figure 24, and, as seen 

 therein, the first moth emerged June 25. The rate of emergence, how- 

 ever, was very low until July 1, but on this date IT moths issued. 



The first moths of the second brood from insectary-bred material 

 issued August 7, and the data indicate that from August 7 to 19 

 there was an overlapping of the moths of the first and second broods. 

 Since there is no way of determining the brood to which the moths 

 from field material belong, a date (Aug. 13) midway between 

 that of the last emergence of the first-brood moths and the first emer- 

 gence of the second-brood moths was taken as the dividing line be- 

 tween the two broods. 



Table XL. — Time of emergence of codling moths of the first brood, from ma- 

 terial reared at the insectary, Grand Junction, Colo., 1916. 



Fig. 23.- 

 brood, 

 1916. 



-Time of emergence of coaling moths of the first 

 insectary-bred material, Grand Junction, Colo., 





Date of 

 emer- 

 gence. 



Num- 

 ber of 

 moths. 



Date of 

 emer- 

 gence. 



Num- 

 ber of 

 moths. 



Date of 

 emer- 

 gence. 



Num- 

 ber of 

 moths. 



Date of 

 emer- 

 gence. 



Num- 

 ber of 

 moths. 



Date of 

 emer- 

 gence. 



Num- 

 ber of 

 moths. 



July 5 

 7 

 8 

 9 



10 

 11 

 12 

 13 

 14 



1 

 3 

 3 

 6 

 19 

 19 

 19 

 24 

 13 



July 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 



39 

 30 

 31 

 50 



40 

 49 

 47 

 44 

 45 



July 24 

 25 

 26 

 27 

 28 

 29 

 „0 

 31 



Aug. 1 



46 

 26 

 40 

 19 

 22 

 21 

 31 

 22 

 22 



Aug. 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 



26 

 22 

 8 

 7 

 5 

 5 

 8 

 3 

 5 



Aug. 11 

 12 

 14 

 15 

 16 

 19 



Total... 



2 

 1 

 3 

 1 

 1 

 1 



829 



