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 LVIL 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. 



Class of infested 



Total 

 forms 

 exam- 

 ined. 



Total 



stages 

 found. 



Total 



stages 

 dead. 



Number stages killed 

 by- 



Percentages of mortality due to- 



forms. 



Cli- 

 mate. 



Preda- 

 tors. 



Para- 

 sites. 



All 



causes. 



Cli- 

 mate. 



Preda- 

 tors. 



Para- 

 sites. 



Fallen squares 



Hanging squares . . 



Hanging bolls 



Fallen bolls 



107, 293 

 24, 683 

 41,738 

 46,200 



63,985 

 14, 390 

 8,737 

 6,825 



34, 403 

 7,084 

 3,328 

 2,375 



17, 596 

 2,543 

 1,709 

 1,128 



13,958 

 1,745 

 1,054 

 1,148 



2,849 



2,796 



565 



99 



53.76 

 49.22 

 38.09 

 34.79 



27.50 

 17.67 

 19.56 

 16.52 



21.81 

 12.19 

 12.06 

 16.80 



4.45 



19.43 



6.47 



1.45 



All classes... 



219,914 



93,937 



47, 190 



22, 976 



17,905 



6,309 



50.23 



24.45 



19.06 



6.71 



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. 





Total 

 forms 

 exam- 

 ined. 



Total 



stages 

 found. 



Total 



stages 

 dead. 



Stages killed by- 



Mortality due to- 



Class of forms and State. 



Cli- 

 mate. 



Preda- 

 tors. 



Para- 

 sites. 



All 



causes. 



Cli- 

 mate. 



Preda- 

 tors. 



Para- 

 sites. 



Fallen squares. 



374 



28, 204 



4,216 



657 



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 



162 



15,177 



2,661 



442 



1,390 



25, 063 



464 



7,628 



6,497 



4,501 



1,144 

 5,184 



499 



63 



46 



3,626 



135 

 1,052 

 1,667 

 1,141 



62 



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 



43 



1,990 



416 



100 



186 



8,547 



136 



2,386 



1,812 



1,980 



188 



881 



41 



6 



6 



727 



5 



253 



290' 



196 



17 



2,243 



263 



117 



152 



7,377 



107 



1,602 



1,347 



633 



60 



651 



34 







2 



496 



1 



208 



211 



88 



2 



562 



391 



21 



52 



1,041 



5 



245 



280 



250 



246 



650 



107 



. 20 



16 



714 



4 



242 



386 



492 



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 

 66.82 

 53.80 

 67.13 



P.ct. 



26.54 

 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 



P.ct. 

 10.49 

 14.77 

 9.88 

 26.47 

 10.93 

 29.43 

 23.06 

 21.00 

 20.73 

 14.06 



5.24 



12.55 



6.81 



0.00 



4.30 



13.67 



0.74 



19.75 



12.66 



7.71 



P.ct. 

 1.23 





3.70 





14.69 



Oklahoma 



4.75 



Southwest Texas 



Southern Texas 



East Texas 



3.74 

 4.15 

 1.07 



Central Texas 



3.21 



Northeast Texas 



North-Central Texas... 



Hanging squares. 



Arkansas 



4.30 



5.55 



21.50 





12.53 





21.44 



Oklahoma 



Southwest Texas 



Southern Texas 



31.74 

 34.70 

 19.69 

 2.96 





22.98 



Northeast Texas 



North-Central Texas . . . 



23.15 

 43.12 



