BIOLOGY OF THE MEXICAN COTTON BOLL WEEVIL. 



13 



Table V. — Oviposition period of the boll tceevil on upland and sea-island cotton 

 squares, insectary records, Madison, Fla., 1918. 



Source of weevils. 



Season. 



Num- 

 ber 

 of fe- 

 males. 



Upland cotton- 

 period. 



Num- 

 ber 

 of fe- 

 males. 



Sea-island cotton. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 





May- July 



12 

 10 



8 

 10 



Bays. 

 59 

 53 



55 

 45 



Days. 

 16 

 5 



31 

 20 



Days. 

 35.9 

 21.7 



39.7 

 35.2 



15 

 10 



10 

 10 



Days. 

 52 



44 



47 

 46 



Days. 

 18 

 16 



25 

 19 



Days. 

 31 





27. 1 



zation. 



First generation 



Second generation 



June-August 



July-September. 



35.4 

 33.6 



Total 



40 







33.1 



45 







31.6 

















SUMMARY OF THE FECUNDITY OF THE BOLL WEEVIL ON SEA- 

 ISLAND AND UPLAND COTTONS UNDER INSECTARY CONDI- 

 TIONS. 



Table VI gives a summary of the fecundity records of the boll 

 weevil on sea-island and upland cottons. Here it is shown that the 

 average number of eggs per day was highest with hibernated weevils 

 for both types of cotton. The maximum number of eggs per day was 

 made by a first-generation female on upland cotton and the maximum 

 number per day on sea-island cotton was made by a hibernated 

 weevil. The average number of eggs per female on upland cotton 

 was 166.1 and the average number of eggs per day 4.92. On sea- 

 island cotton the average number of eggs per female fell to 113.5 and 

 the average per day to 3.8. These averages compare closely with 

 those secured on upland cotton at Victoria, Tex., in 1913, where the 

 females deposited an average of 212 eggs each and oviposition was 

 at a rate of 5.9 eggs per day. 



Table VI: 



-Summary of the fecundity of boll iceevils on sen-island and upland 

 cottons under insectary conditions, 1918. 



Source. 



Number 

 of fe- 

 males 



Average 

 number 

 of eggs 

 per fe- 

 male. 



Average 

 oviposi- 

 tion 

 period. 



Eggs per day. 



Aver- 



Maxi- 

 mum. 



Upland cotton: 



Hibernated 



Hibernated, fall fertilization . 



First generation 



Second generation 



Total. 

 Average 



Sea-island cotton: 



Hibernated 



Hibernated , fall fertilization . 



First generation 



Second generation 



Total. 

 Average 



10 



40 



270.3 



117.7 



222.8 



53.9 



35.9 

 21.7 

 39.7 

 35.2 



33.1 



214.7 



122 

 79.9 

 37.5 



113.5 



31 



27.1 

 35.4 

 33.6 



31.7 



7.18 

 5.4 

 5.6 

 1.5 



4.92 



7.38 

 4.5 

 2.2 

 1.11 



