12 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Time of oviposition. — The time of oviposition in orchards may be 

 determined with fair precision from the combined data on the habits 

 of the moths in captivity, the rearing experiments, and the field 

 observations. In rearing these insects eggs may be readily obtained 

 by confining a number of moths together in cages. It is not possible 

 to determine the number of eggs thus produced, but the time and 

 period of egg deposition can be ascertained. 



Fig. 6.— Emergence curve of spring brood of moths in 1910, at Douglas, Mich. (Original.) 



Table IX. — Egg deposition of the spring brood of moths in cages in 1910, at Douglas, 



Mich. 



No. of 

 cage. 



Num- 

 ber of 

 moths. 



Date of— 



Number of days — 



Emergence. 



First 

 oviposi- 



Last 

 oviposi- 



Before 

 first 

 ovipo- 

 sition. 



Of egg 

 deposi- 



From 

 date of 

 emer- 

 gence 









tion. 



tion. 



tion. 



to last 

 oviposi- 

















tion. 



1 



5 



June 14 



June 19 



June 21 



5 



3 



7 



2 



3 



June 16 



June 20 



do 



4 



2 



5 



3 



15 



June 17 



June 19 



June 25 



2 



7 



8 



4 



36 



June 18 



June 20 



June 26 



2 



7 



8 



5 



57 



June 19 



do 



June 27 



1 



8 



8 



6 



87 



June 20 



June 23 



June 29 



3 



7 



9 



7 



262 



June 22 



do 



July 4 



1 



12 



12 



8 



25 



June 24 



June 29 



July 2 







4 



8 



9 



29 



June 25 



do 



July 10 



4 



12 



15 



10 



27 



June 27 



July 2 



July 7 



5 



6 



10 



11 



16 



June 28 



July 1 



July 3 



3 



3 



5 



12 



24 



June 29 



July 2 



July 10 



3 



9 



11 



13 



36 



June 30 



July 3 



July 9 



3 



7 



9 



« 14 



25 



July 2 



July 9 



do 



7 



1 



/ 



15 



8 



July 6 



July 8 



July 11 



2 



4 



5 



16 



5 



July 9 



July 11 



do 



2 



1 



2 



17 



5 



July 11 



July 14 



July 14 



3 



1 



3 









3.24 



5.53 



7.76 











12 



15 









1 



1 



2 













