126 



DECIDUOUS FKUIT 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 EGGS. 



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. 









Red ring. 



Black spot. 



Hatched. 





No. of 



apple. 



Num- 



Date of 















Length 















ber of 



deposi- 



Date of 



Num- 



Date of 



Num- 





Num- 



of egg 

 stage. 





eggs. 



tion. 



appear- 



ber of 



appear- 



ber of 



Date. 



ber of 









ance. 



eggs. 



ance. 



eggs. 





eggs. 





1 



8 



Apr. 26 



(May 1 

 IMay 2 



5 ! 



2 



May 10 

 May 11 



1 

 6 



jMay 13 



May 17 



May 18 



8 



Days. 

 17 



2 



18 



May 7 



[May 9 

 {May 10 

 [May 15 



4 

 7 



1 ! 



[May 16 

 [May 17 



6 



4 



1 



15 



10 

 11 



3 



20 



May 8 



(May 10 

 J May U 

 IMay 12 

 [May 13 



1 ! 



2 



9 1 

 7 



May 17 

 [May 18 



9 



7 



(May 18 

 {May 19 

 [May 20 



3 



8 

 4 



10 

 11 

 12 









[May 12 



6 i 



1 





(May 20 



6 



11 









May 13 



8 



May 17 



3 



May 21 



2 



12 



4 



22 



•May 9 



{May 14 



1 



[May 18 



15 



{May 22 



6 



13 









May 16 



1 



May 20 



3 



May 23 



1 



14 









IMay 17 



2 







IMay 24 



2 



15 



5 



2 



May 10 



May 13 



2 



May 18 



2 



May 20 



2 



10 



6 



3 



May 11 



May 14 



2 



May 20 



3 



May 22 



3 



11 



7 



218 



May 13 



[May 13 

 May 14 



J May 15 



IMay 16 

 May 17 



[May 18 



71 



53 



25 



6 



May 19 

 May 20 

 May 21 

 May 22 

 May 23 

 May 24 



3 



35 



68 



102 



1 



3 



JMav 22 

 May 23 



[May 24 

 May 25 

 May 26 



10 

 44 

 30 

 42 

 66 



9 

 10 

 11 

 12 

 13 



8 



186 



May 18 



IMay 19 

 May 20 



{May 21 

 May 24 



IMay 26 



5 

 1 



17 

 34 



7 



May 26 

 [May 27 

 May 28 



27 

 50 

 30 



(May 28 

 IMay 29 

 IMay 30 

 I June 1 



45 

 26 

 30 

 14 



10 

 11 

 12 

 14 



9 



16 



May 19 



(May 21 

 {May 24 



(May 26 



3 

 6 



6 



[May 28 

 [May 29 



9 

 6 



jjune 1 



14 



12 









/May 24 

 \May 25 



11 

 20 



(May 26 



30 



May 28 



25 



8 



10 



52 



May 20 



{May 27 

 [May 28 



16 

 4 



May 30 

 June 1 



15 



10 



10 

 11 



11 



26 



May 21 



(May 22 

 {May 23 



3 

 2 



May 28 

 May 29 



2 

 16 



(.May 30 

 [June 1 



18 

 4 



9 

 10 









[May 24 



4 



May 30 



3 



12 



1 



May 22 







May 30 



1 



May 31 



1 



9 



i" 



