CODLING MOTH IN COLORADO. 



43 



spring of 1916, 869 moths issued, or 20.77 per cent of the total num- 

 ber of larvae collected. The rest of the material, 29.22 per cent, 

 did not reach the adult stage. 



g - M5» 



8 c3 IS 3 - * * * ** 5 81 



/91/GUST 



SEPTEMBER OCTOBER 



Fig. 14. — Number of larvae of codling moth collected from banded trees, Hamilton 

 orchard, Grand Junction, Colo., 1915. 



Under field, or nor- 

 mal, conditions, 

 there is a distinct 

 overlapping of the 

 larva? of the first 

 and second broods 

 and of the second 

 and third broods and 

 similarly the moths 

 of the first and sec- 

 ond broods overlap. 

 Hence with larvae 

 collected in the field 

 it is impossible to 

 know at all times to 

 which brood the in- 

 dividuals b el o n g . 

 But with the insects 

 reared at the insect- 

 ary the brood identity 



JULY 



Fig. 15. — Percentage of codling moths emerging from band- 

 collected material, Hamilton orchard, Grand Junction, 

 Colo., 1915. 



