78 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



the sides of the jar. The apples and foliage were daily removed and 

 replaced by fresh material, and to avoid infestation from hatching 

 eggs, which had been placed on the sides and bottom of the jars, 

 it became necessary to transfer the moths twice a week into new 

 jars, the old ones being thoroughly cleaned before being put to fur- 

 ther use. 



In Table VII have been recorded the results from observations on 

 oviposition in 12 rearing jars by moths of a given age. In no 

 instance did oviposition take place until 2 days after the emergence 

 of the moths, and on an average the eggs were first laid during the 

 fourth day after emergence. 



Table VII. — Oviposition periods of spring-brood moths in rearing cages.' 



Cage Xo. 



Xumber 

 of moths. 





Date of— 





Days- 





Emer- 

 gence of 

 moths. 



| 



first ovi- Last ovi- 

 position. { position. 



Before 

 oviposi- 

 tion. 



Length 

 of ovipo- 

 sition. 



Between 

 emer- 

 gence 



and last 































tion. 



1 





June 16 



June 23 



June 25 



7 



3 



9 



2 



10 



June 17 



June 27 



June 29 



10 



3 



12 



3 



10 



June 19 



June 24 June 24 



5 



1 







4 



17 



June 20 



June 23 . June 30 



3 



S 



10 







11 



June 21 



June 24 June 29 



3 



6 



S 



6 



10 



June 22 



June 25 Julv 1 



o 



7 



9 



7 



39 



June 23 



...do July 6 



2 



12 



13 



S 



IS 



June 24 



June 27 July 5 



3 



9 



11 



9 



37 



June 25 



...do July 7 



9 



11 



12 



10 



23 



June 29 



July 7 July 15 



8 



9 



16 



11 



15 



July 1 



Julv 5 ...do 



4 



11 



14 



12 



4 



July 7 



July 12 July 21 



5 



10 



" 



201 







55 



90 



133 : 



The length of oviposition for each jar varied from 1 to 11 days, 

 with an average of 7 days for the entire number of rearing jars. In 

 one instance oviposition took place the sixteenth day after the date 

 of emergence of the moths. On an average, however, oviposition 

 extended to 11 days after emergence. 



Table VIII. — Oviposition periods of spring-brood moths. Summary of Table VII. 



Observations. 



Days be- 

 fore ovi- 

 j position. 



Days of 

 oviposi- 

 tion. 



Days be- 

 tween emer- 

 gence and | 

 last ovipo- 

 sition. 



Average 



4.6 



10 



7. 5 



12 

 1 



11.08 ' 



16 

 5 





2 







In view of the abundance of eggs deposited and the manner in 

 which they were laid, it was impossible to determine the number for a 

 given moth. In the field the relative abundance of eggs during the 

 season must be approximately in proportion to the occurrence of 

 moths (fig. 19). In the rearing jars eggs were obtained from June 23 



