NATURAL CONTROL. 



119 



The extensive series of examinations tabulated above (Table LVI) 

 were made upon immature weevils in all conditions of squares and 

 bolls, the principal of which are known as hanging dry squares, 

 fallen squares, hanging dry bolls, and fallen bolls. The conditions 

 in these four classes of material vary greatly as does the mortality, 

 as is shown in Table LVII. The apparent discrepancy between the 

 totals in Table LVII and in Table LVI is due to the admission of 

 other minor classes of material in the first table. This table (LVII) 

 also excludes mortality from plant proliferation. 



Table LVII. 



Mortality of immature boll weevils in various classes of cotton forms, 

 1906-1909. 



Still another extremely important aspect of this large series needs 

 to be shown. This is the geographical differences in the control by 

 climate, predators, and parasites. 



Table LVIII. — Average mortality of immature boll weevils in various classes of cotton 

 forms by States, 1906-1909. 



Class of forms and State. 



Fallen squares. 



Arkansas 



Louisiana 



Mississippi 



Oklahoma 



Southwest Texas 



Southern Texas 



Fast Texas 



Central Texas 



Northeast Texas 



North-Central Texas 



Hanging squares. 



Arkansas 



Louisiana 



Mississippi 



Oklahoma 



Southwest Texas 



Southern Texas 



Fast Texas 



Central Texas 



Northeast Texas 



North-Central Texas 



Total 

 forms 

 exam- 

 ined. 



374 



28,204 



4,216 



667 



2, 757 



38, 007 



825 



14,879 



10,318 



7,066 



1,612 



8,601 



784 



100 



89 



5.740 



192 



2,094 



4.044 



1.992 



Total 

 stages 

 found. 



162 

 15,177 

 2,661 



442 



1,390 



25,063 



464 

 7,028 

 6, 197 

 4,501 



1.144 



5,184 



499 



63 



46 



3,626 



L35 



1,052 



1,007 



1,141 



Total 

 stages 

 dead. 



02 



4,895 



1,070 



238 



390 



16, 965 



248 



4,233 



3.439 



2,863 



494 



2,182 



182 



26 



24 



1,937 



10 



703 



887 



766 



Stages killed by- 



Cli- Preda- 

 mate. tors. 



43 



1,990 



410 



100 



186 



8,547 



136 



2,386 



1,812 



1,980 



188 



881 



41 



6 



6 



727 



5 



253 



290 



190 



17 



2,243 



263 



117 



152 



7,377 



107 



1,602 



1,347 



633 



60 

 651 

 34 







2 



496 



1 



208 



211 



Para- 

 sites. 



2 



562 



391 



21 



52 



1,041 



5 



245 



280 



2,50 



246 



650 



107 



20 



16 



714 



4 



242 



386 



492 



Mortality due to- 



All 

 causes. 



P.ct. 

 38.27 

 32.25 

 40.21 

 53.84 

 28.06 

 67.68 

 53.44 

 55.49 

 52. 93 

 63.60 



43.18 

 42.09 

 36.47 

 41.27 

 52. 10 

 53. 41 

 7.40 



60.82 

 53.80 

 67.13 



Cli- 

 mate. 



P.ct. 

 20.54 

 13. 11 

 15.63 

 22.62 

 13. 38 

 34.10 

 29.31 

 31.28 

 27.89 

 43.99 



16.43 



16.99 



8.21 



9.53 



13.00 



20.04 



3.70 



24.04 



17.39 



17. 17 



Preda- 

 tors. 



p. a. 



10.49 

 14.77 

 9. SS 

 20. 47 

 10. 93 

 29.43 

 23.00 

 21.00 

 20. 73 

 14.00 



5.24 

 12.55 

 6.81 

 0.00 

 4.30 

 13.67 

 0.74 

 19.75 

 12.66 

 7.71 



Para- 

 sites. 



P.ct. 

 1.23 

 3.70 

 L4.69 



4.75 

 3.74 

 4.15 

 1.07 

 3.21 

 4.30 

 5.55 



21.50 

 12.53 

 21.44 

 31.74 

 34.70 

 19. 69 

 2.96 

 22. 98 

 23.15 

 43. 12 



