CODLING MOTH IN COLORADO. 



85 



Moths of the spring brood, 1915. — A certain lot of wintering 

 larvae were placed in cages with the view to determining at what 

 periods of the day the moths of the spring brood emerge. The ob- 

 servations were taken at 8 a. m., noon, and 6 p. m. from May 14 to 

 May 28, inclusive. It will be noted in Table LX that 1,189 moths 

 issued during the 15-day period ; 60, or 5.05 per cent, issued between 

 6 p. m. and 8 a. m. ; 928, or 78.05 per cent, between 8 a. m. and 12 

 o'clock noon, and 201 moths, or 16.90 per cent, between 12 noon 

 and 6 p. m. 



Table LX. — Emergence of codling moths of the spring brood, Grand Junction, 



Colo., 1915. 





Number of moths emerging — 





Number of moths emerging — 



Date of 





Date of 



















observa- 









observa- 









tion. 



6 p. m. to 



8 a. m. to 



12 noon to 



tion. 



6 p.m. to 



8 a. m. to 



12 noon to 





8 a. m. 



12 noon. 



6 p.m. 





8 a.m. 



12 noon. 



6 p. m. 



May 14 











19 



May 23 







104 



20 



15 



9 



23 



13 



24 



5 



175 



17 



16 







114 



12 



25 



9 



109 







17 



34 



98 



16 



26 







25 



22 



18 







21 



8 



27 







75 



29 



19 



1 



28 



' 



28 



1 



75 



24 



20 



1 

























21 







3 



5 



Total . . 



60 



928 



201 



22 







78 



16 



Per ct. . 



5.05 



78.05 



16.90 



Moths of the first brood, 1915. — Records of the emergence of moths 

 of the first brood were taken hourly from 6 a. m. to 6 p. m., inclusive, 

 and again at 9 p. m. and 12 o'clock midnight from August 16 to 20, 

 inclusive. A total of 641 moths was used in this study, the details of 

 which are given in Table LXI, in which it will be observed that 

 no moths issued between midnight and 6 a. m., nor did any emerge 

 between 6 a. m. and 7 a. m. During the 5-hour interval from 9 a. m. 

 to 2 p. m., 431 moths, or 67.24 per cent, issued. The maximum emer- 

 gence for any one hour occurred during the period from 9 a. m. to 

 10 a. m. From 6 p. m. to 7 a. m., a period of 13 hours, there emerged 

 35 moths, or 5.46 per cent of the total. 



Table LXI. — Emergence of codling moths of the first brood, hourly, from 6 

 a. m. to 6 p. m., and at 9 p. m. and 12 midnight, Grand Junction, Colo., 

 1915. 





Ob- 

 serva- 

 tion 



No. 



Number of moths emerging at — 



Total 

 num- 

 ber 

 of 

 moths. 



Date of 

 emergence 

 of moths. 



A.M. 



P.M. 



6 



7 



8 



9 



10 



11 



12 



2 

 18 

 11 

 20 

 16 



1 



6 



3 



12 



25 



18 



2 



4 

 8 

 11 

 12 

 13 



3 



7 

 2 

 10 



8 

 13 



4 



5 



6 



9 



12 



Aug. 16 



17 

 18 

 19 

 20 



Total. 



1 

 2 

 3 

 4 

 5 





3 



14 

 36 

 25 

 22 

 21 



5 

 7 

 14 

 8 

 8 



3 

 12 

 12 

 10 



6 



1 

 8 

 1 

 9 

 3 



5 

 10 

 6 

 3 



8 



.... 



2 



50 

 152 

 143 

 161 

 135 











48 









16 

 9 

 1 



24 

 34 

 25 







1 

 1 



















2 



26 



134 



118 



67 



64 



48 



40 



42 



43 



22 



32 



3 



641 







