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 ' 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. 



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 OP 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 



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



