26 



INSECT ENEMIES OF THE BOLL WEEVIL. 



Following the plan adopted for the 1906 records these figures 

 may be weighted for comparison with the earlier records. 



Table X. — The hypothetical or weighted average mortality of the boll tveevil in 1907.^ 



1 Given 10,000 weevil stages. 



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 mortalit}^ during 1908 was 44.84 per cent when figured 

 from the total number of stages, the total mortality thus showing 

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

 increase of 1.68 per cent. 



T.^BLE XI. — Boll-weevil mortality in 11/08. 



