12 



BULLETIN 926. U. S. DEPARTMENT OF AGRICULTURE. 



respond very closely ; that is, the higher the mean daily temperature 

 the higher the average number of eggs until the period of oviposition 

 begins to decline (fig. 3). 



68 25 



87 ?4 



80 2J 



OS 22 



84 21 



85 20 

 82 19 

 8/ /8 

 80 /7 

 79 /6 

 78 /5 



77 /4 



78 /J 

 75 /2 

 74- // 

 73 /O 

 72 9 



7/ a 



70 

 69 

 68 

 67 

 66 

 66 

 6* 



Fig. 

















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x.j.J.-.J.g.fig 



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 6 

 <6 

 4 

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M&W D/l/LY OWPOS/T/O/V Or 



3. — Relation of mean daily temperature to mean daily oviposition of hibernated 



weevils. 



The oviposition records of the boll weevil on sea-island cotton 

 differ very little from those on upland cotton under insectary 

 conditions. The female weevils fertilized in the spring deposited 

 eggs for an average period of 31 days and the hibernated weevils 



Si^ar 



fG6 l/tr/A/G Pf/F/OP (MYS) 

 Fig. 4. — Mean daily oviposition of female weevils in upland cotton squares. 



fertilized in the fall, for an average period of 27.1 days. The first 

 and second generation weevils deposited eggs for average periods of 

 35.4 and 33.6 days, respectively. The average oviposition period for 

 the females in sea-island cotton squares is shown to be 31.6 days. 



