22 



BULLETIN 358, U. S. DEPARTMENT OF AGRICULTURE. 



simply shows the relative effect of the bolls and squares upon the 

 act of oviposition. Table XVI shows the activity of nine females 

 treated in this manner. 



Table XVI. — Fecundity of females of Anthonomus grandis on cotton squares and cotton 



bolls on alternate days. 



Eggs deposited in squares. 



Eggs deposited in bolls. 



Maxi- 

 Total. mum 

 per day. 



Average 

 per day. 



Total. 



Maxi- 

 mum 

 per day. 



Average 

 per day. 



10 

 21 

 24 

 21 



5 

 40 

 25 

 23 



4 

 37 

 41 



2 



8 

 6 

 9 

 3 



11 



5 

 3 



11 

 9 



0.36 

 1.28 

 2.00 

 5.26 



.28 

 2.42 

 1.36 



1.54 



.16 



1.42 



1.52 



16 

 6 

 5 

 6 

 8 

 19 

 16 

 11 

 1 

 21 

 12 



2 

 2 

 1 

 3 

 3 

 3 

 5 

 2 

 1 

 4 

 3 



0.58 

 .12 

 .50 



1.50 

 .46 



1.16 

 .86 

 .74 

 .12 

 .80 

 .68 



251 j 11 



1.21 



121 



5 .59 



From this it is seen that the average eggs per female per day was 

 1.21 on cotton squares and 0.59 on bolls. Consequently the greater 

 suitability of the square for deposition is quite evident. 



Summary of all fecundity observations on cotton squares. — Table 

 XVII gives a brief summary of the foregoing studies on fecundity 

 when the females were with males throughout life and were fed 

 cotton squares. Here it is seen that the three series containing tliur- 

 beriae females gave the lowest average of total eggs per female, and 

 that the first-generation grandis gave the highest . The average eggs 

 per female in all series was 68.2 and the average per day was 1.8. 



Table XVII. — Fecundity of all boll weevils on cotton squares: Summary. 



Source. 



Number 

 females. 



Average 

 eggs per 

 female. 



Average 

 oviposi- 



ti:n 

 perbd. 



Eggs per day. 



Average. 



Maxi- 

 mum. 



Hibernated grandis J 20 69.85 



First generation grandis 13 132.54 



Second generation grandis I 5 69.4 



Hibernated thurberiae 19 56. 2 



First generation thurberiae 10 24. 4 



Female grandis and male thurberiae 12 72. 5 



Female thurberiae and male grandis IS 54 



Total 97 



Average 6S. 2 



37. 



1.8 



The averages are all surprisingly low, the lowest on record for a 

 season for the boll weevil, in fact. In 1902 to 1904, at Victoria, Tex., 

 the females averaged 89 eggs each at the rate of 2.8 per day, while at 



