150 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



The average length of life of the moths in cage A was 10.5 days, 

 while that of those in cage B was 7.41 days. The combined average 

 was thus 9.19 days. 



Table XXXVI.— Longevity of moths of spring brood. Summary of Table XXXV. 



Observations. Days. 



Average .1 9.19 



Maximum j 18 



Minimum 1 



FIRST GENERATION. 



■LRST BROOD OF EGGS. 



Incubation period. — In the preceding pages the length of the period 

 of egg deposition was considered under the habits of the moth. 



A record of the length of the egg stage for 34 eggs is shown in Table 

 XXXVII. As mentioned before, the earliest emerging moths would 

 not oviposit in the cages, and it is probable that all eggs deposited 

 previous to June 1 required from 15 to 18 days for the egg stage. 



Table XXX VII. — First-brood eggs. Incubation period of eggs laid in the rearing cages. 







Red ring. Black spot. 



Hatched. 





No. of 

 apple. 



Num- 

 ber of 











Length 

 of 

 egg 



d t e .P° ?i " Date of 

 tlon - appear- 



Num- Date of Num- 





Num- 





eggs. 



ber of appear- ber of 



Date. 



ber of 



stage. 







ance. 



eggs. ance. eggs. 





eggs. 





1 



1 



June 1 i June 7 



1 



June 14 



1 



June 16 



1 



Days. 

 15 



2 



3 



June 2 ' June 5 



3 



June 15 



3 



June 17 



3 



15 



3 



4 



...do June 6 



4 



...do 



4 



...do 



4 



15 



4 



3 



--• d0 feme"! 



2 ...do 2 



1 June 16 1 



}..do.... 



3 



15 



5 



•5 



June 4 June 7 



- (June 15 4 

 3 \June 16 ! 1 



jjune IS 



5 



14 



6 



4 



June 5 June 8 



4 June 17 



...do 



4 



13 



7 



2 



■--*• MZ~i- 



\ jjune 18 



2 



- 



June 19 



2 



14 



8 



2 



*™ s {'21 is 



! }--<"> 



2 



- d0 



2 



11 



9 



4 



...do do 



4 ...do 



4 



...do 



4 



11 



10 



2 



...do June 12 



2 ...do 



2 



...do 



2 



11 



11 



3 



*»* 9 {ESS 11 



1 }-do 



3 



...do 



3 



10 



12 



1 



June 10 ...do 



1 June 19 



1 



June 20 



1 



10 



13 



1 



June 11 June 13 



1 June 20 



1 



June 23 



1 



12 



14 



1 



June 12 ...do 



1 ...do 



1 



...do 



1 



11 



15 



8 



June 16 June 18 



8 June 26 



8 



June 28 



- 



12 



Table XXXVIII shows a summary of Table XXXVII. 

 Table XXXVIII. — Incubation period of first -brood eggs. Summary of Table XXXVII. 



Days of 

 Observations. incuba- 

 tion. 



Average 12.77 



Maximum 15 



Minimum 10 



