SHARE OF INSECT CONTROL IN WEEVIL MORTALITY. 



25 



1906. — The data on the mortahty of the weevil in 1006 may there- 

 fore be condensed and tabulated as follows: 



Table VII. — Boll-weevil mortality in 1906. 





Number of 

 weevil 

 stages. 



Percentage 



of stages 



alive. 



Percentage of stages killed by — 



Total per- 

 centage of 

 mortality. 



Class of forms. 



Climate. 



Predators. 



Parasites. 



Hanging bolls 



5,452 



4,118 



4,969 



25,534 



66.59 

 46.20 

 64.53 

 34.80 



10.98 

 20.30 

 13.34 

 31.20 



16.52 

 20.50 

 19.01 

 30.70 



5.90 



13.00 



.90 



3.30 



33.41 





53.80 



Fallen bolls 



35.47 





65.20 







Totals and averages 



40,073 



44.19 



25.15 



26.31 



4.31 



55.81 



' Table VIII. — The hypothetical or weighted average mortality of the boll weevil, 1906. 









1906— Mortality from— 





Prolifera- 

 tion. 





Climate. 



Predators. 



Parasites. 



Total. 



Class of forms. 







— , 





^ 









^ 









^ 



o 



0) 





o 



CD 



o 



'% 



o . 



oS 



o 



-o 

































M 



"o 



ba- 



S 



m 



?.^ 



S 



?.^ 



% 



?,,^ 



H 



So^ 











S. <^ 





'2 



c3 fl 





a a 





03 Pi 











a 









a 



•a 



as 

 3% 





la 



a 



II 



z 



P q 



r 



% 



a 













aj 



S '-' 





S ^ 





S "-I 











Ph 



!? 



Ph 



:z; 



tf 



(L, 



% 



Ph 



^ 



Ph 



% 





^ 



Hanging bolls 



0.75 



75 



6.30 



4.7 



70.3 



10.98 



1.1 



16.52 



n.6 



5.90 



4.1 



37.4 



28.1 



Hanging squares 



4.25 



425 



13.50 



57.4 



367.6 



20. 30 



74.6 



20.50 



75.413.00 



47.8 



60.0 



255.2 



Total hanging.. 



5.00 



500 



62.1 



437.9 





82.3 





87.0 



51.9 





283.3 



Fallen bolls 



14.25 



1,425 



8,80 



90.0 



1,335.013.34 



178.1 



19.01 



253.8 



.90 



12.0 



37.4 



533.9 



Fallen squares 



80.75 



8,075 



13.50 



1,090.1 



6,984.9 



31.20 



2, 179. 3 



30.70 



2, 144. 4 



3.30 



230.5 



69.8 



5.644.3 



Total fallen 



95.00 



9,500 





1,180.1 



8,319.9 





2,357.4 





2,398.2 





242.5 





6,178.2 



Totals and aver- 





























ages 



100.00 



10,000 



12.42 



1,242.1 





24. a» 



2,439.7 



24.85 



2,485.2 



2.94 



294.4 



64.61 



6.461 5 





1'' 



1 Given 10,000 weevil stages. 



1901 . — The mortality during 1907 was 54.27 per cent when figured 

 from the total number of stages and total mortality, thus shovvdng a 

 decrease of 1.54 per cent from the mortality of 1906 figured in the 

 same manner. The parasitism showed an increase of 4.01 per cent. 



Table IX. — Boll-weevil mortality in 1907. 



Class of forms. 



Number of 

 weevil 

 stages. 



Percentage 



of stages 



alive. 



Percentage of stages killed by — 



Total per- 

 centage of 

 mortality. 



Climate. 



Predators. 



Parasites. 



Hanging bolls 



431 



2,612 



342 



10,020 



76.80 

 51.40 

 49.42 

 42.90 



8.58 

 14.50 

 31.28 

 33.50 



3.02 

 7.50 

 14.91 

 19.90 



11.60 



26.60 



1.46 



3.70 



23.20 



Hanging squares . . 



48.60 



Fallen bolls 



50 58 





57.10 







Totals and averages 



13,405 



45.73 



29.06 



16.88 



8.32 



54.27 



