INCREASE OF MORTALITY WITH MORE SEVERE ATTACK. 25 
_ Tasre VIII.—Comparison of four varieties, each having over 500 observations in Table VI11, 
showing average percentages of mortality and influence of proliferation thereon. 
Squares with proliferation. Squares without proliferation. 
Average 
2 = Num- -ey. | imcrease 
Variety. age bar oF Num- | per cent Late Num- Per eo cazatee 
squares) squares | ber of | 4¢ tases ih ber centofi num- i a 
exam- with weevil tenes wat weevil | stages _ ber of to rae 
ined.  prolif- | stages) Goaq rolif- Stages | found _ stages Aang 
/ era- | found. | : ges found. dead. per 100 ‘ind 
tion. | an squares. ji 
| | 
SeEQiOry...--..->-- 1,568 | 828 | 763 22.4 740 422 3.7 76 18.7 
eee 1,525 812} 250 | 16.7 713 331 6 38 16.1 
__ 672 i) ee ee se oe a 81 18.0 
a 567 259 | 172 | 17.5 308 177 1.7 62 15.8 
In squares having proliferation the range in mortality varies 
between 16.7 per cent for King and 27.1 per cent for Shine. In 
squares without proliferation this range is between 0.6 per cent for 
King and 9.1 per cent for Shine. The most striking point in this com- 
parison is shown in the last column of the table giving the average 
_ increase in mortality due to proliferation in each variety. In spite of 
the variations of 8.5 and 10.4 in the preceding percentage columns 
there is shown in the last column a variation of only 2.9 percent. The 
unfavorable influence of proliferation appears, therefore, to be very 
nearly constant in different varieties, instead of varying widely, as 
early indications had led us to anticipate that it might do. 
In respect to the rapidity of maturity these four varieties may be 
_. fairly considered as ranging from the very earliest to the late varieties. 
Rapid maturing or, in other words, ‘‘short season”’ cotton does not 
seem to increase especially either the formation of proliferation or the 
percentage of mortality occurring in the squares. 
INCREASE OF MORTALITY ACCOMPANYING MORE SEVERE ATTACK. 
While only injured squares were selected for these examinations 
_ there was a difference in the severity of the weevil attack in different 
fields. It was evident during the growing season that the field in 
~ which most of the data for Shine was obtained was being more severely 
injured than any other in which observations were made. The figures 
show some very interesting results of this condition, if, indeed, they 
do not indicate the explanation for the increased severity of the 
attack. The four varieties may be arranged in the order of the 
_ increasing proportion of weevil stages to number of squares examined. 
The figures for the number of weevil stages found and for the stages 
‘dead in squares without proliferation are reduced to the common basis 
of 1.000 squares for convenience in comparing. 
