126 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



range for developing first-brood larvae. Maximum oviposition oc- 

 curred from May 7 to 20, or from 15 to 30 days after full bloom on 

 most varieties of apples. 



No records were kept as to the length of the oviposition period for 

 individuals. Oviposition was observed throughout the day, but 

 chiefly in the evening and at night. 



FIRST GENERATION. 



FIRST BROOD OF EGOS. 



Incubation period. — Practically all of the spring brood of moths 

 that emerged were utilized for egg records and were placed in Riley 

 cages, where they oviposited on apples suspended from strings. 

 The apples were removed each morning and transferred to jelly 

 glasses and kept under serial numbers. It was found necessary 

 to cover the glasses with a fine piece of cloth in order to keep out 

 hymenopterous egg parasites. 



Table XII shows a complete record for 720 eggs deposited from 

 April 26 to May 17. 



Table XII. — First-brood eggs. Incubation period of eggs laid in rearing cages. 



