40 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XXXIX. — Egg deposition by individual moths; summary of Tables XXXVII 



and XXXVIII. 



Observations. 



Minimum. 



Eggs per female 



Eggs per day per female 



Days before' egg deposition per female 



Days of egg deposition per female 



Days moths lived after egg deposition 

 Days moths 1 ived 



From the 160 separate experiments only 12 yielded results worth 

 recording, and these are given in Tables XXXVII-XXXIX. The 

 following observations are recorded in Table XXXVII: The time of 

 emergence of the different moths, the time and amount of egg depo- 

 sition per female, and the date of death of each of the female moths. 

 In Table XXXVIII a summary of results will be found showing the 

 number of eggs per female, the number of days before egg deposition, 

 the duration of egg deposition, and the length of life of the moths. 

 It will be noted that on an average these "moths commenced to oviposit 

 5.6 days after their emergence; the maximum length of this period 

 was 9 days and the minimum 3 days. Egg deposition extended on 

 an average over a period of 5 days. The average number of eggs per 

 female was 57.08, the maximum number of eggs per female 161, and 

 the minimum 15 eggs per female. The moths lived, on an average, 

 3.2 days after egg deposition; in one instance death followed the day 

 after the last oviposition ; on the other extreme a single moth lived 8 

 days after the last egg deposition. 



The conditions under which it was necessary to keep these moths 

 for observation were of course quite abnormal and it is doubtful 

 whether all of the moths deposited the normal number of eggs. It is 

 the writer's opinion that in the field the average number of eggs per 

 female is considerably higher and may reach an average of 75 to 85 

 eggs per female. 



Egg deposition in stock-jar experiments. — The nature of the stock- 

 jar tests has already been described on page 13. As will be found in 

 Table XL, the observations merely cover the date of emergence of 

 moths in each cage and the date of the first and last egg depositions 

 per jar, which give only an idea of the extent of the oviposition 

 period. We find from these data that on an average the first eggs 

 were laid four days after the date of emergence of the moths. 



