74 
Table XXVI. — Comparative injury by holhvorm to early-planted and late-planted cotton. 
Early-planted. 
Late-planted. 
Per 
cent 
of 
in- 
jury. 
Per 
cent in 
favor 
of 
early 
plant- 
ing. 
Locality. 
Date of 
planting. 
cent 
Seed P^ 
Date of 
planting. 
Seed used. 
Kind of soil. 
Ladonia, Tex 
Ben Franklin, Tex. 
Quinlan.Tex 
Willspoint, Tex ... 
Paris, Tex 
Almont, Tex 
Apr. 1 
Mar. 19 
Apr. 1 
Mar. 30 
....do... 
Mar. 23 
King .1 23.6 
1 
Hall..i 5.6 
King. 5.5 
...do.. 4.9 
Gin... 19.7 
King .( 5.6 
i 9.3 
May 2 
Apr. 15 
Apr. 25 
May 2 
May 1 
June 2 
King 
Hall 
Gin 
Rowden . . 
Gin 
Fleming.. 
35.3 
23.5 
10.0 
10.0 
29.6 
23.6 
11.7 
17.9 
4.5 
4.1 
9.9 
18.0 
Black-waxy, wood- 
ed. 
Do. 
Post-oak. 
Gray prairie. 
Black prairie. 
Red River bottom. 
Average of all ob- 
20.7 
11.4 
servations. 
: 
. 
It will be noted that in determining the percentage of injuiy obser- 
vations were made on earl}^ and late cotton in the same locality and on 
the same date, as shown in Tables XXV and XXVI, so that the com- 
parisons are quite fair. The average total injury to early cotton was 
9.3 per cent, as compared with an averaoe total of 20. 7 per cent to late 
cotton. This difference is undoubtedly less than would be the case 
during seasons of more severe bollworm injur^^ than occurred in 1901:. 
The decided preference of the bollworm for squares and young bolls 
is shown in the figures of average percentages of injury given in both 
tables. Thus, the sum of the percentages of injury, as shown in the 
tables, to squares and bolls one-half grown or less is 119.9, while on 
bolls from three-fourths to full grown the injury amounts to only 11.5 
per cent. 
The fact of the comparativelj" less injur}^ to early cotton indicates 
the desirability not only of planting as earl^^ in the spring as possible, 
but of adopting all other practicable measures that will further th-e 
production of an early crop, such as the use of seed of earh^ fruiting 
varieties, the use of fertilizers to hasten and increase the production 
of fruit, and eai'ly and thorough cultivation. This subject will be 
more fully discussed under the consideration of remedial measures. 
AMOUNT OF DAMAGE DONE BY A SINGLE LARVA. 
Owing to the very different method of attack on corn and cotton, 
the damage done b}^ a single larva is of an entirel}' different nature in 
the two cases and will be considered separateh^. 
DAMAGE TO YOUNG CORX. 
When the larva feeds on 3'oung corn b}" eating into the bud, consid- 
erable injur}' is done to the unfolding leaves and the plant presents a 
very ragged appearance. (See PL VII, fig. 1.) From general obser- 
vation it would seem that the small percentage of plants which are 
injured when 3^oung must be less productive later in the season. 
