22 



BULLETIN 358, U. S. DEPARTMENT OF AGEICULTUEE. 



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. 



Total. 



Maxi- 

 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 

 7 

 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..5S 

 .12 

 .50 



1.50 

 .46 



1.16 

 .86 

 .74 

 .12 

 .80 

 .68 



251 



11 



1.21 



121 



5 



.59 



From this it is seen that the average eggs per female ]^er 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 fecunditi/ 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 thur- 

 heriae 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 J^iVII. — Fecundity of all boll weevils on cotton squares: Summary. 



Source. 



Number 



Average 

 eggs per 

 female. 



Average 

 oviposi- 



ti:n 

 period. 



Eggs per day. 



Average. 



Maxi- 

 mum. 



Hibernated grandis 



First generation grandis 



Second generation grandis 



Hibernated thurberiae 



First generation thurberiae 



Female grandis and male thurberiae. 

 Female thurberiae and male grandis. 



Total. 

 Average 



69.85 

 132. 54 

 69.4 

 56.2 

 24.4 

 72.5 

 54 



Days. 

 34.5 



• 50 

 22.6 

 41.79 

 31.4 

 26 

 43.2 



68.2 



37.7 



2.1 

 2.7 

 3.1 

 1.3 

 3.5 

 2.8 

 1.3 



The averages are ail 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 



