CODLING MOTH IN COLORADO. 



59 



Moths of the Fikst Bkood. 

 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 

 larvse 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- " ^J " * ■ «ww " 



Sponded more Closely FlG - 23 - — Time of emergence of codling moths of the first 



to that which would ^ insectar y- bred material > Grand Junction ' Mo- 

 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 17 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. 





K / 



I 





















V 



V 



A 



y 



> 



; 



f\ 











V 



V 



V 



r 



I 



V 



\ 



sT 



\ J 



/ 



r 









M 



M 



V 







V 



y 



1 



so 









i 



v 





















If 





















































*****. 



Date of 



Num- 



Date of 



Num- 



Date of 



Num- 



Date of 



Num- 



Date of 



Num- 



emer- 



ber of 



emer- 



ber of 



emer- 



ber of 



emer- 



ber of 



emer- 



ber of 



gence. 



moths. 



gence. 



moths. 



gence. 



moths. 



gence. 



moths. 



gence. 



moths. 



July 5 



1 



July 15 



39 



July 24 



46 



Aug. 2 



26 



Aug. 11 



2 



7 



3 



16 



30 



25 



26 



3 



22 



12 



1 



8 



3 



17 



31 



26 



40 



4 



8 



14 



3 



9 



6 



18 



50 



27 



19 



5 



7 



15 



1 



10 



19 



19 



40 



28 



22 



6 



5 



16 



1 



11 



19 



20 



49 



29 



21 



7 



5 



19 



1 



12 



19 



21 



47 



u0 



31 



8 



8 









13 



24 



22 



44 



31 



22 



9 



3 



Total... 



829 



14 



13 



23 



45 



Aug. 1 



22 



10 



5 







