4 



BULLETIN 429, U. S. DEPARTMENT OP AGRICULTURE. 



EMERGENCE OF SPRING BROOD OP MOTHS. 



The time for emergence of moths from Ros well-collected rearing 

 material was contrasted with that brought from Douglas, Mich., and 

 it was found that from the Roswell material moths emerged several 

 days earlier than from material introduced from a more northern 

 location, but were less regular in the number and time of appearance, 

 although covering almost the same length of time. The Michigan 

 moths showed a marked maximum of emergence about May 1 ; other- 

 wise considerable similarity is noted. In this connection 542 moths 

 were reared from the New Mexico material and 506 from the lot 

 from Michigan. The records for emergence for the spring brood are 

 given in Table I. 1 



Table I. — Time of emergence of spring brood of codling moth, Rosicell, X. Mex., in 

 comparison with emergence of moths from material from Douglas, Mich., 1912. (See 



fig. 1-) 





Number of moths emerging. 





Number of moths emerging. 



Date of 

 emergence. 





Date of 

 emergence. 









Roswell. 



Douglas. 



Total. 



Roswell. 



Douglas. 



Total. 



Apr. 12 .. 



13... 



14... 



15... 



16... 



17... 



18... 



19... 



20... 



21... 



22... 



23... 



24... 



25... 



26... 



27... 



28... 



29... 



30... 

 May 1... 

 2 



s'.Y. 



4... 

 5... 

 6... 



4 

 1 

 1 

 

 1 

 5 

 5 

 4 



15 

 13 

 10 

 12 

 26 

 27 

 26 

 13 

 8 

 11 

 10 

 32 

 11 

 11 

 9 

 16 

 23 





4 

 1 

 1 

 

 1 

 5 

 5 

 4 



15 

 13 

 10 

 13 

 28 

 31 

 32 

 17 

 23 

 47 

 58 

 7S 



May 7... 



8... 



9... 

 10... 

 11... 

 12... 

 13... 

 14... 

 15... 

 16... 

 17... 

 18... 

 19... 

 20... 

 21... 

 22... 

 23... 

 24... 

 25... 

 26... 

 27... 

 28... 



Total.. 



36 



19 



28 



13 



12 



25 



23 



4 



5 



24 



12 



14 



8 



8 



8 



4 



2 











2 







1 



28 

 15 

 12 

 9 

 9 

 10 

 16 

 

 

 10 

 4 

 6 

 6 

 3 

 5 

 

 2 



64 



34 



40 



22 



21 



35 



39 



4 



5 



34 



16 



20 



14 



11 



13 



4 



4 











2 







1 























1 



2 



4 



6 



4 



15 



36 



48 



46 







64 75 

 62 73 









27 

 37 



43 

 60 



542 



506 



1,048 



EGG DEPOSITION OF SPRING BROOD OF MOTHS. 



In order to secure deposition records on the spring brood, moths 

 were confined in cages after the first emergence on April 21. From 

 the 13 moths issuing in cage No. 1, bearing the above date of emer- 

 gence, the first oviposition occurred April 25 — four days later — and 

 oviposition continued for a period of three days, the last deposition 

 in cage No. 1 occurring April 28, seven days after emergence. The 

 last oviposition recorded for the entire period covered by observations 



1 Explanatory note. — It may be well to explain here that each table in this publication should be 

 considered a unit. Consecutive or successive tables are not necessarily continuations of the life history 

 of the same individuals. For example, it will be noted that Table XIV is a record of the length of feeding 

 period of 489 transforming larvae of the second generation, while Table XVI includes observations on 

 the length of the cocooning period of only 282 larvae of this generation. Differences of this character may 

 be due to natural or artificial causes, such as death of the insects, accidental injury, the removal of 

 specimens for other purposes, etc. 



