CODLING MOTH IN COLORADO. 



25 



three days from banded apple trees in the Hamilton orchard. The 

 first of these sources was used primarily as a means of establishing 

 the approximate emergence limits of the first-brood moths, while the 

 moths that issued up 

 to August 19 from the 

 larvae collected in the 

 Hamilton orchard 

 were used for the ovi- 

 position study of the 

 first brood. The lat- 

 ter moths were em- 

 ployed for this pur- 

 pose because their 

 relative rate of emer- 

 gence approaches nor- 

 mal field conditions 

 more closely than 

 that of the moths 

 from the insectary 

 reared larvse. 



According to the insectary-bred material, the first moth appeared 

 July 7 and the emergence continued daily, except on a few days, to 

 August 15. (See Table XIV and fig. 6.) 



Table XIV. — Time of emergence of codling moths of the first brood, from 

 material reared at the insectary, Grand Junction, Colo., 1915. 



Fig. 6. — Time of emergence of moths of the first brood of 

 the codling- moth, Grand Junction, Colo., 1915. 



Date of 



Num- 



Date of 



Num- 



Date of 



Num- 



Date of 



Num- 



emer- 



ber of 



emer- 



ber of 



emer- 



ber of 



emer- 



ber cf 



gence. 



moths. 



gence. 



moths. 



gence. 



moths. 



gence. 



moths. 



July 7 



2 



July 19 



17 



July 29 



10 



Aug. 7 



7 



9 



2 



20 



12 



30 



12 



8 



8 



11 



20 



21 



17 . 



31 



13 



9 



5 



12 



12 



22 



9 



Aug. 1 



12 



10 



3 



13 



30 



23 



14 



2 



9 



12 



1 



14 



13 



24 



14 



3 



9 



13 



2 



15 



19 



25 



27 



4 



15 



15 



1 



16 



24 



26 



2 



5 



17 









17 



13 



27 



13 



6 



3 



Total- 



426 



18 



30 



28 



9 











As given in Table XXV, the first moth of the second brood issued 

 August 23, thus leaving a period from August 16 to 22, inclusive^ 

 during which no moths issued from larvae reared at the insectary. 



This condition did not obtain with the material from the Hamilton 

 orchard on account of the much larger number of individuals in- 

 volved, but instead moths issued continuously during the foregoing 

 period as would naturally occur in the field. During the interval 

 August 16 to 22 there was probably an overlapping of the broods 



