COTTON BOLL WEEVIL IN THE MISSISSIPPI VALLEY. 31 



Table XXV. — Number of generations of the boll weevil: Maximum series on squares. 



Generation. 



First generation: 



Eggs laid 



Generation mature 

 Second generation: 



Eggs laid 



Generation mature 

 Third generation: 



Eggs laid 



Generation mature 

 Fourth generation: 



Eggs laid 



Generation mature 

 Fifth generation: 



Eggs laid 



Generation mature 

 Sixth generation: 



Eggs laid 



Generation mature 

 Seventh generation: 



Eggs laid 



Generation mature 



Date. 



June 1. 

 June 22 



June 23 

 July 9 



July 15 

 July 28 



Aug. 2 

 Aug. 18 



Sept. 2 

 Sept. 17 



Sept. 18 

 Oct. 8 



Oct. 13 

 Nov. 1 



Period 



from 



maturity 



to 

 maturitv. 



Days. 



At Victoria in 1913 the weevils were carried through the same pro- 

 cedure and the same number of generations secured. However, the 

 first hibernated females at Victoria were secured over a month earlier 

 than those at Tallulah and the breeding continued a few days longer 

 in the fall. In other words, the generations were sufficiently shorter 

 at Tallulah to allow the same number to be produced in more than a 

 month less than at Victoria. 



SUMMARY. 



In northern Louisiana the average longevity of the boll weevil 

 adults on cotton squares was 54.56 days; on bolls 31.41 days; on 

 cotton leaves 8.17, and on okra fruit 5.4, the average for these differ- 

 ent classes of foods being 14.13 days. 



The females live somewhat longer than the males, there being an 

 average of 12.5 days for females and 9.82 for males. 



A number of weevils were found feeding in okra blooms in the 

 field but attempts to cause them to breed in okra fruit in the labor- 

 atory were unsuccessful. A number of eggs were deposited but they 

 failed to hatch. 



The largest number of eggs deposited by the first generation wee- 

 vils was 204, the average being 132. The* daily maximum varied 

 from 5 to 12. Second generation weevils showed somewhat less 

 fecundity, the maximum oviposition being 175 eggs and the average 

 69.4. 



The average period of oviposition was 38.2 days, the range being 

 1 to 77 days. 



