26 



INSECT ENEMIES OF THE BOLL WEE^aL. 



Following the plan adopted for the 1906 records these figures 

 may be weighted for comparison mth the earlier records. 



Table X. — TJie hypothetical or iveighted average mortality of the boll weevil in 1907} 





1 



S 



D 



O 02 





1907— Mortality from — 





Prolifer- 

 ation. 



1 

 1 



Climate. 



Predators. 



Parasites. 



Total. 



Class of forms. 



=3 



i 

 1 



s 



d 



o 



II 



Oh 



1 



1 



o 



ti 



is 



J 



S 



o 



II 



|i 



1 



h 



i° 



1 



1 

 S 



D 



Hanging bolls 



Hanging squares 



0.75 

 4.25 



75 

 425 



6.30 

 13.50 



4.7 

 57.4 



70.3 

 367.6 



8.58 

 14.50 



6.0 

 53.3 



3.02 



7.50 



2. 1 11. 60 

 27. 7| 26. 60 



8.1 

 97.8 



29.70 

 55.50 



20.9 

 236. 2 



Total hanging.. 



5.00 



500 







62.1 437. 9| 



59.3 



! 29.8 



il05.9 





257.1 



Fallen bolls 



14.251 1,425 



R.-'^nl 90. 1 . 335. n .'^1 . 2S 



417. 6 14. 9l! 199. 0! 1.46' 19. 5 50.90' 726.1 



Fallen squares 



80. 75 8, 075 13. 50'l, 090. 16, 9S4. 9 33. 50 



2. 339. 6 19. 90 1, 389. 8 3. 70|25S. 4 o2. 80 5, 077. 9 



Total fallen 



95.00 9,500| 



1,180.1 



8,319.9 



2,757.2 



1,588.8 



277. 9 





5,804.0 



Totals and aver- 

 ages 



i 1 i 



100.0010.00012.421.242.1 



1 1 1 







28.16 



2,816.5 



16.181,618.6 



3.83 



383.8 



60.61 



6,001.1 



1 Given 10,000 weevil 



This table shows a weighted increase of 0.89 per cent for parasites 

 and a weighted decrease of 4 per cent for all agencies due to the 

 falling off in control by predators. 



1908. — The mortahty during 1908 was 44.34 per cent when figured 

 from the total number of stages, the total mortahty thus shomng 

 a decrease of 9.93 per cent from 1907. The parasitism showed an 

 increase of 1.68 per cent. 



Table XL — Boll-iveevil mortality in 1908. 





Number of 

 weevil 

 stages. 



Percentage 



of stages 



alive. 



Percentage of stages killed by- 



Class of forms. 



Climate. 



Predators. 



Parasites. 



All agen- 

 cies. 



Hanging bolls 



1.839 



5,922 



941 



20,844 



49.40 

 49.01 

 70. 25 

 57.28 



38.48 

 19.24 

 20.08 

 20.30 



3.97 

 9.80 

 5.95 

 15.18 



8.15 

 21.70 

 3.71 

 7.15 



50.60 



Hanging squares 



50.99 



Fallen bolls 



29.75 



Fallen squares 



42.72 



Totals and averages 



29,546 



55.66 



2L21 



13.12 



10.00 



44.34 



