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. 



12.14 It 18 20 22 24 2t 2.8 30 2 4 b 8 10 12 14 fa IS 20 22 24 Zb 28 



June July 



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. 



