134 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



ture seems to have influenced emergence to some extent, especially 

 during the early part. After August 18, when most of the moths had 

 already emerged, no conclusions could be drawn regarding the influ- 

 ence of temperature conditions. 



The emergence curves of both spring and first-brood moths, as 

 recorded at San Jose, are very much at variance with those of Mr. 

 Hammar 1 at North East, Pa., who obtained more gradual maxi- 

 mums and minimums and not such sudden rises and falls as are 

 recorded in this paper. The warmer nights in the Eastern States 

 undoubtedly bring about this set of conditions. 



Table XXII. — Emergence of moths of the first brood from material collected from banded 



trees. 



Date of 



Number 



Date of 



Number 



Date of 



Number 



Date of 



Number 



emergence. 



of moths. 



emergence. 



of moths. 



emergence. 



of moths. 



emergence. 



of moths. 



July 8 



19 



July 26 



4 



Aug. 13 



25 



Aug. 30 



4 



July 10 



14 



July 27 



6 



Aug. 14 



14 



Aug. 31 



3 



July 11 



5 



July 28 



16 



Aug. 15 



14 



Sept. 1 



7 



July 13 



6 



July 29 



5 



Aug. 16 



6 



Sept. 2 



2 



July 14 



3 



July 31 



10 



Aug. 17 



19 



Sept. 3 



2 



July 15 



4 



Aug. 1 



13 



Aug. 18 



6 



Sept. 4 



2 



July 16 



3 



Aug. 3 



32 



Aug. 19 



8 



Sept. 5 



5 



July 17 



19 



Aug. 4 



19 



Aug. 20 



14 



Sept. 8 



2 



July 18 



19 



Aug. 5 



49 



Aug. 21 



7 



Sept. 10 



5 



July 19 



14 



Aug. 6 



2 



Aug. 23 



- 9 



Sept. 16 



2 



July 20 



44 



Aug. 7 



27 



Aug. 24 



8 ! 



Sept. 18 



1 



July 21 



18 



Aug. 8 



1 



Aug. 25 



10 j 



Sept. 20 



1 



July 22 



3 



Aug. 9 



22 



Aug. 26 



11 



Sept. 21 



1 



July 23 



12 



Aug. 10 



10 



Aug. 27 



1 



Sept. 22 



1 



July 24 



23 



Aug. 11 



9 



Aug. 28 



3 1 







July 25 



11 



Aug. 12 



14 



Aug. 29 



7 







Oviposition period. — No individual records for oviposition were kept 

 except that 10 or 12 separate pairs were confined in mica chimneys 

 to find out the total number of eggs a single moth would deposit. 

 Unfortunately these notes were lost and also the data on the length 

 of oviposition. It will be seen later from' data on the length of the 

 egg stage that eggs were obtained July 9, one day after the first 

 moths emerged. This appears to be unusual and in all probability 

 the first moths emerged before July 8, but were overlooked in the 

 jars. General observations on the length of oviposition, while secur- 

 ing eggs in the cages, made it evident that some moths deposited eggs 

 for from 7 days up to 2 weeks. 



LIFE CYCLE OF FIRST GENERATION. 



As will be seen in Table XV, a number of larvae were reared in 

 apples and records kept until the moths emerged. This with the 

 exception of the length of the egg stage and an addition of 3 days 

 (time before oviposition) would give the life cycle, which is properly 

 from egg to egg. The average length of the egg stage of the first 



U. S. Dept. Agr., Bur. Ent., Bui. 80, Part VI. 



